Skip to main content

Notes

Stream packet sniffer to Wireshark

  • Start a promiscuous capture with filter "udp port 37008"
  • Setup Mikrotik Packet Sniffer to stream to your IP address

Setup system emailer

I have noticed that in RouterOS v2, the emailer uses the system identity as the HELO/EHLO host name. Some mail servers won't accept a host name with spaces or other characters. RouterOS v3 doesn't seem to be effected by this.

The following is for version 3 and 4:

/tool e-mail 
set server=69.18.98.42:587 from="mikrotik@change.me" 
/system watchdog
set auto-send-supout=yes send-email-to=notify@change.me send-smtp-server=69.18.98.42

The following is required for version 5:

/tool e-mail 
set address=69.18.98.42 port=587 from="mikrotik@change.me" 
/system watchdog
set auto-send-supout=yes send-email-to=notify@change.me send-smtp-server=69.18.98.42

NTP Client and Time Zone

/system clock
set time-zone-name=America/Chicago
/system ntp client
set enabled=yes mode=unicast primary-ntp=129.6.15.28 secondary-ntp=129.6.15.29

Google Public DNS Settings

For newer routers:

/ip dns
set allow-remote-requests=yes cache-max-ttl=1w cache-size=2048KiB max-udp-packet-size=512 servers=8.8.8.8,8.8.4.4

For older routers:

/ip dns
set allow-remote-requests=yes cache-max-ttl=1w primary-dns=8.8.8.8 secondary-dns=8.8.4.4

OpenDNS DNS Settings

For newer routers:

/ip dns
set allow-remote-requests=yes cache-max-ttl=1w cache-size=2048KiB max-udp-packet-size=512 servers=208.67.222.222,208.67.220.220

For older routers:

/ip dns
set allow-remote-requests=yes cache-max-ttl=1w primary-dns=208.67.222.222 secondary-dns=208.67.220.220

Protecting your WAN Interface

# Pick your WAN input interface
# DO NOT COPY AND PASTE ALL THESE RULES!!!

/ ip firewall filter

add chain=input in-interface=ether1 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether2 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether3 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether4 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether5 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether6 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether7 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether8 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether9 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether10 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
add chain=input in-interface=ether11 action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 

add chain=input in-interface=pppoe action=jump jump-target=protect-wan-input src-address-list=!allowed-management comment="Filter WAN input" disabled=no 
 
add chain=input action=jump jump-target=protect-wan-input in-interface=vlan src-address-list=!allowed-management comment="" disabled=no 

# The protect-wan-input chain

/ ip firewall filter  
add action=drop chain=protect-wan-input comment="Protect services running on the WAN interface" disabled=no dst-port=21 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=22 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=23 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=53 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=53 protocol=udp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=80 protocol=tcp
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=443 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=3128 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=8080 protocol=tcp 
add action=drop chain=protect-wan-input comment="" disabled=no dst-port=64872-64875 protocol=tcp 
add action=jump chain=protect-wan-input comment="" disabled=no jump-target=manage-icmp protocol=icmp 
add chain=protect-wan-input action=accept comment="Log traffic WAN traffic" disabled=no

# manage-icmp chain

/ ip firewall filter 
add chain=manage-icmp protocol=icmp icmp-options=8:0 action=accept comment="Allow pings" disabled=no 
add chain=manage-icmp protocol=icmp icmp-options=0:0 action=accept comment="Accept responses to our pings" disabled=no 
add chain=manage-icmp protocol=icmp icmp-options=3:0 action=accept comment="# Accept notifications of unreachable hosts" disabled=no 
add chain=manage-icmp protocol=icmp icmp-options=4:0 action=accept comment="# Accept notifications to reduce sending speed" disabled=no 
add chain=manage-icmp protocol=icmp icmp-options=11:0 action=accept comment="# Accept notifications of lost packets" disabled=no 
add chain=manage-icmp protocol=icmp icmp-options=12:0 action=accept comment="# Accept notifications of protocol problems" disabled=no 
add chain=manage-icmp protocol=icmp action=drop comment="Drop all other ICMP traffic" disabled=no

Traffic Marking and outbound queueing

/ip firewall mangle
add action=jump chain=prerouting comment="Jump to mark-traffic: MUST RETURN FROM THIS JUMP" disabled=no jump-target=mark-traffic
add action=jump chain=output comment="Jump to mark-traffic: MUST RETURN FROM THIS JUMP" disabled=no jump-target=mark-traffic packet-mark=no-mark
add action=mark-packet chain=mark-traffic comment="mark-traffic: default mark bulk" disabled=no new-packet-mark=bulk passthrough=yes
add action=mark-packet chain=mark-traffic comment="mark-traffic: voice" disabled=no dst-address-list=voice-servers new-packet-mark=voice passthrough=yes
add action=return chain=mark-traffic comment="" disabled=no packet-mark=voice
add action=return chain=mark-traffic comment="mark-traffic: end of chain return" disabled=no


/queue type
add kind=sfq name=qos sfq-allot=1514 sfq-perturb=5

/queue tree
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan1-root packet-mark="" parent=ether1 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan1-bulk packet-mark=bulk,no-mark parent=queue-wan1-root priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan1-voice packet-mark=voice parent=queue-wan1-root priority=1 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan1-priority-data packet-mark=priority-data parent=queue-wan1-root priority=7 queue=qos

/queue tree
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan2-root packet-mark="" parent=ether2 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan2-bulk packet-mark=bulk,no-mark parent=queue-wan2-root priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan2-voice packet-mark=voice parent=queue-wan2-root priority=1 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=queue-wan2-priority-data packet-mark=priority-data parent=queue-wan2-root priority=7 queue=qos

Best Effort Queuing with Global-In and Guaranteed Queuing on outbound with two ISPs and connection tracking

This sets up three root queues: queue-root-global-in (best effort), queue-root-isp1 (guaranteed), queue-root-isp2 (guaranteed).

queue-root-global-in deals with traffic coming from the internet to the router and catches traffic that is bound for the router itself as well as traffic that will be forwarded through to NAT clients. There is a subqueue for each isp.

queue-root-isp1 deals with the outbound traffic to isp1 from the router as well as NAT clients behind the router.

queue-root-isp2 deals with the outbound traffic to isp2 from the router as well as NAT clients behind the router.

The traffic that is handled in these last two queues is marked by the mark-traffic mangle chain. The packet marks are generic to the type of traffic (bulk, priority, voice) because the root queues are connected to specific interfaces.

The traffic that is handled in the global-in queue is marked by rules in the prerouting chain. The packets marks are specific to the interface that the traffic came in on (isp1-bulk, isp2-bulk, etc) because the root queue is not connected to a specific interface but to global-in, which is an aggregate of ALL incoming packets on ALL interfaces.

/queue type
add kind=sfq name=qos sfq-allot=1514 sfq-perturb=5

/queue tree
add burst-limit=0 burst-threshold=0 burst-time=0s comment="isp1 outbound queue" disabled=no limit-at=128k max-limit=100M name=queue-root-isp1 parent=ether1 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-bulk packet-mark=bulk,no-mark parent=queue-root-isp1 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-priority packet-mark=priority parent=queue-root-isp1 priority=7 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-voice packet-mark=voice parent=queue-root-isp1 priority=1 queue=qos

add burst-limit=0 burst-threshold=0 burst-time=0s comment="isp2 outbound queue" disabled=no limit-at=128k max-limit=100M name=queue-root-isp2 parent=ether2 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-bulk packet-mark=bulk,no-mark parent=queue-root-isp2 priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-priority packet-mark=priority parent=queue-root-isp2 priority=7 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-voice packet-mark=voice parent=queue-root-isp2 priority=1 queue=qos

add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=0 max-limit=0 name=global-in-root parent=global-in priority=8 comment="inbound queue root" queue=qos

add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-from-internet-root parent=global-in-root priority=8 comment="isp1 inbound queue" queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-fi-bulk packet-mark=isp1-fi-bulk parent=isp1-from-internet-root priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-fi-priority packet-mark=isp1-fi-priority parent=isp1-from-internet-root priority=7 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp1-fi-voice packet-mark=isp1-fi-voice parent=isp1-from-internet-root priority=1 queue=qos

add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-from-internet-root parent=global-in-root priority=8 comment="isp2 inbound queue" queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-fi-bulk packet-mark=isp2-fi-bulk parent=isp2-from-internet-root priority=8 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-fi-priority packet-mark=isp2-fi-priority parent=isp2-from-internet-root priority=7 queue=qos
add burst-limit=0 burst-threshold=0 burst-time=0s disabled=no limit-at=128k max-limit=100M name=isp2-fi-voice packet-mark=isp2-fi-voice parent=isp2-from-internet-root priority=1 queue=qos

These are the associated firewall rules:

/ip firewall mangle
add action=jump chain=prerouting comment="Jump to mark-traffic: MUST RETURN FROM THIS JUMP" disabled=no jump-target=mark-traffic

add action=mark-packet chain=prerouting comment="isp1 global-in packet marking - bulk" disabled=no in-interface=ether1 new-packet-mark=isp1-fi-bulk passthrough=yes
add action=mark-packet chain=prerouting comment="isp1 global-in voice" disabled=no in-interface=ether1 new-packet-mark=isp1-fi-voice passthrough=no src-address-list=voice-servers
add action=mark-packet chain=prerouting comment="isp1 global-in priority placeholder" disabled=yes in-interface=ether1 new-packet-mark=isp1-fi-priority passthrough=no src-address=1.1.1.1

add action=mark-packet chain=prerouting comment="isp2 global-in packet marking - bulk" disabled=no in-interface=ether2 new-packet-mark=isp2-fi-bulk passthrough=yes
add action=mark-packet chain=prerouting comment="isp2 global-in voice" disabled=no in-interface=ether2 new-packet-mark=isp2-fi-voice passthrough=no src-address-list=voice-servers
add action=mark-packet chain=prerouting comment="isp2 global-in priority placeholder" disabled=yes in-interface=ether2 new-packet-mark=isp2-fi-priority passthrough=no src-address=2.2.2.2

add action=jump chain=output comment="Jump to mark-traffic: MUST RETURN FROM THIS JUMP" disabled=no jump-target=mark-traffic packet-mark=no-mark

add action=mark-connection chain=prerouting comment="isp1 connection tracking" connection-state=new disabled=no in-interface=ether1 new-connection-mark=isp1 passthrough=no
add action=mark-routing chain=prerouting connection-mark=isp1 disabled=no in-interface=!ether1 new-routing-mark=isp1 passthrough=no
add action=mark-routing chain=output connection-mark=isp1 disabled=no new-routing-mark=isp1 passthrough=no src-address=1.1.1.0/30

add action=mark-connection chain=prerouting comment="isp2 connection tracking" connection-state=new disabled=no in-interface=ether2 new-connection-mark=isp2 passthrough=no
add action=mark-routing chain=prerouting connection-mark=isp2 disabled=no in-interface=!ether2 new-routing-mark=isp2 passthrough=no
add action=mark-routing chain=output connection-mark=isp2 disabled=no new-routing-mark=isp2 passthrough=no src-address=2.2.2.0/30

add action=mark-packet chain=mark-traffic comment="mark-traffic: default mark bulk" disabled=no new-packet-mark=bulk passthrough=yes
add action=mark-packet chain=mark-traffic comment="mark-traffic: voice" disabled=no dst-address-list=voice-servers new-packet-mark=voice passthrough=yes
add action=return chain=mark-traffic disabled=no packet-mark=voice

add action=mark-packet chain=mark-traffic comment="mark-traffic: priority (placeholder)" disabled=yes dst-address=1.1.1.1 new-packet-mark=priority passthrough=yes
add action=return chain=mark-traffic disabled=yes packet-mark=priority

add action=return chain=mark-traffic comment="mark-traffic: end of chain return" disabled=no

These are the needed routing table entries:

/ip route
add check-gateway=ping comment="default route via isp1" disabled=no distance=1 dst-address=0.0.0.0/0 gateway=1.1.1.1
add check-gateway=ping comment="default route via isp2" disabled=no distance=20 dst-address=0.0.0.0/0 gateway=2.2.2.1

add check-gateway=ping comment="isp1 default route" disabled=no dst-address=0.0.0.0/0 gateway=1.1.1.1 routing-mark=isp1
add check-gateway=ping comment="isp2 default route" disabled=no dst-address=0.0.0.0/0 gateway=2.2.2.1 routing-mark=isp2

Enable/Disable Services

/ ip service 
set telnet port=23 address=0.0.0.0/0 disabled=no 
set ftp port=21 address=0.0.0.0/0 disabled=yes 
set www port=80 address=0.0.0.0/0 disabled=yes 
set ssh port=22 address=0.0.0.0/0 disabled=no 
set www-ssl port=443 address=0.0.0.0/0 certificate=none disabled=yes

Enable/Disable Service Ports

/ ip firewall service-port 
set ftp ports=21 disabled=no 
set tftp ports=69 disabled=no 
set irc ports=6667 disabled=no 
set h323 disabled=yes 
set quake3 disabled=no 
set gre disabled=no 
set pptp disabled=no

Initial SNMP configuration

This simply turns on SNMP and sets the public community to only be access from localhost, which renders it useless.

Add your own community entry to make use of SNMP, but I recommend not deleting the public entry. This is due to an issue in the Mikrotik export function for SNMP.

/snmp
set contact="" enabled=yes engine-boots=0 engine-id="" location="" \
    time-window=15 trap-sink=0.0.0.0 trap-version=1
/snmp community
set public address=127.0.0.1/32 authentication-password="" \
    authentication-protocol=MD5 encryption-password="" encryption-protocol=\
    DES name=public read-access=yes security=none write-access=no

For v5:

/snmp
set contact="" enabled=yes engine-id="" location="" trap-community=public \
    trap-target=0.0.0.0 trap-version=1
/snmp community
set public address=127.0.0.1/32 authentication-password="" \
    authentication-protocol=MD5 encryption-password="" encryption-protocol=DES \
    name=public read-access=yes security=none write-access=no
add address=0.0.0.0/0 authentication-password="" authentication-protocol=MD5 \
    encryption-password="" encryption-protocol=DES name=localmon read-access=\
    yes security=none write-access=no
/snmp
set contact="" enabled=yes engine-id="" location="" trap-community=public \
    trap-target=0.0.0.0 trap-version=1

Protecting your LAN

/ip firewall filter
add chain=protect-lan connection-state=invalid action=drop comment="Drop invalid packets" disabled=no 
add chain=protect-lan connection-state=established action=accept comment="Allow established traffic to pass" disabled=no 
add chain=protect-lan connection-state=related action=accept comment="Allow related traffic to pass" disabled=no 
add chain=protect-lan action=drop comment="Drop everything else" disabled=no

Private IP Subnet address lists

/ip firewall address-list
add address=10.0.0.0/8 comment="private 10.0.0.0/255.0.0.0" disabled=no list=private-ip-subnets
add address=172.16.0.0/12 comment="private 172.16.0.0/255.240.0.0" disabled=no list=private-ip-subnets
add address=192.168.0.0/16 comment="private 192.168.0.0/255.255.0.0" disabled=no list=private-ip-subnets

Dealing with SPAM from inside

These rules will allow outbound smtp from valid internal addresses, block it from ip's that we think are compromised, and track connections to determine if we think an ip is compromised.

/ip firewall filter
add action=jump chain=forward comment="Push outbound SMTP traffic to the filter-smtp chain - check address lists for banned IPs" disabled=no dst-port=25 \
    in-interface=bridge-lan jump-target=filter-smtp protocol=tcp

/ip firewall filter
add action=drop chain=filter-smtp comment="SPAM: Block SMTP from blacklist static list" disabled=no \
    src-address-list=smtp-possible-spammers-static
add action=add-src-to-address-list address-list=smtp-possible-spammers address-list-timeout=9m \
    chain=filter-smtp comment=\
    "SPAM: Test outbound connections for connection limit for whitelisted limit" connection-limit=\
    10,32 disabled=no dst-port=25 protocol=tcp src-address-list=smtp-allowed-outbound
add action=add-src-to-address-list address-list=smtp-possible-spammers address-list-timeout=9m \
    chain=filter-smtp comment="SPAM: Test outbound connections for connection limit" \
    connection-limit=2,32 disabled=no dst-port=25 protocol=tcp src-address-list=\
    !smtp-allowed-outbound
add action=log chain=filter-smtp comment="SPAM: Log SMTP from blacklist" disabled=no log-prefix=\
    possible-spammer src-address-list=smtp-possible-spammers
add action=drop chain=filter-smtp comment="SPAM: Block SMTP from blacklist" disabled=no \
    src-address-list=smtp-possible-spammers
add action=return chain=filter-smtp comment="SPAM: Good packet... return" disabled=no

Once this is done, we need to be notified somehow. This is done with a script that runs every X minutes. The script sends a single email for each address listed. Add addresses to the smtp-possible-spammers list for 10 minutes (or more) and run this scripts every 5 minutes.

:local spamadmin notify@change.me

:local count 0
:local message ""
:local tmp

:foreach i in=[/ip firewall address-list find list=smtp-possible-spammers] \
do={ \
:set count ($count + 1)
:set tmp ([/ip firewall address-list get $i address])
:set message ($message . $tmp . "\r\n")
:log warning ("possible spammfer found at " . $tmp)
}

:if ($count > 0) \
do={ \
:log info "watch-for-spammers sending notification"
/tool e-mail send \
     to=$spamadmin \
     subject=([/system identity get name] . ": $count possible spammers found") \
     body=$message
}

Paste the following in a terminal to create the above script:

/system script
add name=watch-for-spammers source=":local spamadmin notify@change.me\r\
    \n\r\
    \n:local count 0\r\
    \n:local message \"\"\r\
    \n:local tmp\r\
    \n\r\
    \n:foreach i in=[/ip firewall address-list find list=smtp-possible-spammer\
    s] \\\r\
    \ndo={ \\\r\
    \n:set count (\$count + 1)\r\
    \n:set tmp ([/ip firewall address-list get \$i address])\r\
    \n:set message (\$message . \$tmp . \"\\r\\n\")\r\
    \n:log warning (\"possible spammfer found at \" . \$tmp)\r\
    \n}\r\
    \n\r\
    \n:if (\$count > 0) \\\r\
    \ndo={ \\\r\
    \n:log info \"watch-for-spammers sending notification\"\r\
    \n/tool e-mail send \\\r\
    \n     to=\$spamadmin \\\r\
    \n     subject=([/system identity get name] . \": \$count possible spammer\
    s found\") \\\r\
    \n     body=\$message\r\
    \n}\r\
    \n"

This is the line to add the scheduled task.

/system scheduler 
add comment="" disabled=no interval=5m name="check-spammer-list" on-event="/system script run watch-for-spammers" \
    start-date=jan/01/1970 start-time=00:00:00

An alternate method is to allow outbound SMTP only from a specified list of IP's. The rules below allow outbound SMTP from addresses on the list smtp-allowed-outbound, and logs all other tries to smtp-possible-spammers followed by the drop.

/ ip firewall filter 
add chain=lan-forward-out action=accept dst-port=25 protocol=tcp \
    src-address-list=smtp-allowed-outbound comment="SPAM: Allow traffic from \
    whitelist" disabled=no 
add chain=lan-forward-out action=add-src-to-address-list dst-port=25 \
    protocol=tcp address-list=smtp-possible-spammers address-list-timeout=0s \
    comment="Log all other outbound SMTP" disabled=no 
add chain=lan-forward-out action=drop dst-port=25 protocol=tcp comment="Drop \
    all other outbound SMTP" disabled=no

Scripting

# list addresses in visisted-mailserver address-list
/ip firewall address-list
:foreach i in [find list=visited-mailservers ] do={:put [get $i address]}

Automated Backups

Make sure you change the smtpserver value to a valid SMTP server for your Internet connection.

:log info "backup Beginning now"
:local toaddress systembackup@change.me

:global subject ([/system identity get name] . " Backup " . [/system clock get time])
:global backupfile ([/system identity get name] . "_backup")

:log info "backup Backing up config"
/export file="$backupfile"

:log info "backup pausing for 3s"
:delay 3s

:log info "backup being emailed"
/tool e-mail send to=$toaddress subject=$subject file="$backupfile.rsc"

:log info "backup finished"

Paste the following in a terminal to create the above script:

/system script
add name=backup-router policy=ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive source=":log info \"backup\
    \_Beginning now\"\r\
    \n:local toaddress systembackup@change.me\r\
    \n\r\
    \n:global subject ([/system identity get name] . \" Backup \" . [/system clock get time])\r\
    \n:global backupfile ([/system identity get name] . \"_backup\")\r\
    \n\r\
    \n:log info \"backup Backing up config\"\r\
    \n/export file=\"\$backupfile\"\r\
    \n\r\
    \n:log info \"backup pausing for 3s\"\r\
    \n:delay 3s\r\
    \n\r\
    \n:log info \"backup being emailed\"\r\
    \n/tool e-mail send to=\$toaddress subject=\$subject file=\"\$backupfile.rsc\"\r\
    \n\r\
    \n:log info \"backup finished\"\r\
    \n"

If you want the router to automatically email you the backup on an interval use the following script:

/system scheduler
add disabled=no interval=1w name=backup-router-weekly on-event="/system script run backup-router \r\n"\
    start-date=jan/01/2012 start-time=01:00:00

Netwatching

This will send an email on up and down:

/tool netwatch
add comment="some-device" disabled=no \
	down-script="/tool e-mail send to=email@domain.com subject=\"some-device down\"" \
	up-script="/tool e-mail send to=email@domain.com subject=\"some-device up\"" \
	host=1.1.1.1

This will add an entry to the log on up and down:

/tool netwatch
add comment="some-device" disabled=no \
    down-script="/log warning message=\"some-device down\"" \
    up-script="/log warning message=\"some-device up\"" \
    host=1.1.1.1 interval=10s timeout=1s

Clearing the arp cache

The following script will clear the arp cache every $delaytime a total of $numloops times.

:log info "clearing arp table of dynamic entries"
:local counter 0
:local delaytime 5
:local numloops 12

:while ($counter < $numloops) do={ \

:log info "clearing arp loop"

:foreach i in=[/ip arp find dynamic=yes] do={ \
/ip arp remove $i
}

:log info "delaying..."

:delay $delaytime

}

Clear connections

This script clears the connection tracking table:

add name=clear-connections policy=ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive,api source=":log info message=\"clearing connections begin\
    \"\r\
    \n:foreach i in=[/ip firewall connection find] do={/ip firewall connection remove \$i}\r\
    \n:log info message=\"clearing connections end\"\r\
    \n"

Upgrade timing

RouterBoard 150

RouterOS 2.9.46, BIOS 2.9 -> RouterOS 2.9.51: 2m45s
RouterOS 2.9.51, BIOS 2.9 -> BIOS 2.12: 30s

RouterOS 2.9.51, BIOS 2.12 -> RouterOS 3.9: 2m5s
RouterOS 2.9.51, BIOS 2.12 -> RouterOS 3.9: 2m0s

RouterOS 3.9, BIOS 2.12 -> BIOS 2.14: 28s
RouterOS 3.9, BIOS 2.12 -> BIOS 2.14: 28s

OSPF Route Filtering

/routing filter
add action=accept chain=ospf-private-only-out comment="" disabled=no invert-match=no prefix=10.0.0.0/8 prefix-length=8-32
add action=accept chain=ospf-private-only-out comment="" disabled=no invert-match=no prefix=172.16.0.0/12 prefix-length=12-32
add action=accept chain=ospf-private-only-out comment="" disabled=no invert-match=no prefix=192.168.0.0/16 prefix-length=16-32
add action=discard chain=ospf-private-only-out comment="" disabled=no invert-match=no
add action=accept chain=ospf-private-only-in comment="" disabled=no invert-match=no prefix=10.0.0.0/8 prefix-length=8-32
add action=accept chain=ospf-private-only-in comment="" disabled=no invert-match=no prefix=172.16.0.0/12 prefix-length=12-32
add action=accept chain=ospf-private-only-in comment="" disabled=no invert-match=no prefix=192.168.0.0/16 prefix-length=16-32
add action=discard chain=ospf-private-only-in comment="" disabled=no invert-match=no

/routing ospf instance
set [ find default=yes ] disabled=no distribute-default=never in-filter=ospf-private-only-in metric-bgp=auto metric-connected=20 metric-default=1 \
    metric-other-ospf=auto metric-rip=20 metric-static=20 name=default out-filter=ospf-private-only-out redistribute-bgp=no redistribute-connected=as-type-1 \
    redistribute-other-ospf=no redistribute-rip=no redistribute-static=no router-id=0.0.0.0

Hotspot and Apple IOS

http://forum.mikrotik.com/viewtopic.php?f=2&t=42942 http://www.cadincweb.com/why-your-apple-ios-7-device-wont-connect-to-the-wifi-network

/ip hotspot profile set hsprof1 dns-name=""
/ip hotspot walled-garden
add action=allow disabled=no dst-host=www.appleiphonecell.com dst-port=""
add action=allow disabled=no dst-host=captive.apple.com dst-port=""
add action=allow disabled=no dst-host=www.apple.com dst-port="" path=/library/test/success.html

Send email with attached log on startup

/system scheduler
add comment="" disabled=no interval=0s name=startup-notify on-event="/log print file=mikrotik.log.txt\r\
    \n/tool e-mail send to=notify@change.me subject=\"\$[/system identity get name] startup at \$[/system c\
    lock get time] \$[/system clock get date]\" body=\"See attached log file\" file=mikrotik.log.txt\r\
    \n" policy=ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive start-time=startup

Private use MAC addresses

The following range of MAC Addresses are reserved for private use:

AC:DE:48:00:00:00 to AC:DE:48:FF:FF:FF

When creating bridge interfaces on the Mikrotik router, create an admin MAC address using this range. I pull the last three octets from an actual device on the router.

Pantech UML290

What makes it work is the phone number: *99***3#

/interface ppp-client
add add-default-route=yes allow=pap,chap,mschap1,mschap2 data-channel=0 \
    dial-command=ATDT dial-on-demand=no disabled=no info-channel=0 \
    keepalive-timeout=30 max-mru=1500 max-mtu=1500 modem-init="" mrru=disabled \
    name=ppp-out1 null-modem=no password="" phone=*99***3# pin="" port=usb2 \
    profile=default use-peer-dns=yes user=""



/interface ppp-client
set 0 add-default-route=yes allow=pap,chap,mschap1,mschap2 data-channel=0 \
    dial-command=ATDT dial-on-demand=no disabled=no info-channel=0 \
    keepalive-timeout=30 max-mru=1500 max-mtu=1500 modem-init="" mrru=disabled \
    name=ppp-out-cellular null-modem=no password="" phone=*99***3# pin="" port=usb2 \
    profile=default use-peer-dns=yes user=""

Sprint - Sierra Wireless 598

/interface ppp-client
add add-default-route=yes allow=pap,chap,mschap1,mschap2 data-channel=0 \
    dial-command=ATDT dial-on-demand=no disabled=no info-channel=0 \
    keepalive-timeout=30 max-mru=1500 max-mtu=1500 modem-init="" mrru=disabled \
    name=ppp-out-cellular null-modem=no password="" phone=#777 pin="" port=usb1 \
    profile=default use-peer-dns=no user=""

IPSEC/IPIP/MSS Mangling

MSS should be set to 40 bytes less than the MTU of the circuit.
All caluclations below assume a circuit the supports a maximum MTU of 1500 bytes.
If these tunnels traverse a PPPoE circuit, an additional 20 bytes would need to be subtracted for PPPoE overhead.

IPSEC Max Overhead: 58 bytes (depends on tunnel/transport/ESP/AH)
IPIP Tunnel Overhead: 50 bytes
GRE Tunnel Overhead: 24 bytes
EOIP Tunnel Overhead: None due to fragmentation support

MSS without IPSEC:
GRE Tunnel  : MTU 1476 - 40 = MSS 1436 (If MSS >= 1437-65535, change mss to 1436)
IPIP Tunnel : MTU 1450 - 40 = MSS 1410 (If MSS >= 1411-65535, change mss to 1410)

MSS with IPSEC:
EOIP Tunnel :
GRE Tunnel  : MTU 1476 - 58 - 40 = MSS 1378 (If MSS >= 1379-65535, change mss to 1378)
IPIP Tunnel : MTU 1450 - 58 - 40 = MSS 1352 (If MSS >= 1353-65535, change mss to 1352)

To be on the safe side, you could just create a generic rule to change the MSS down to 1350. Doing this sacrifices anywhere from 2 to 86 bytes, but covers your bases for all tunnel types.

Rule sets for MSS 1350

/ip firewall mangle
add action=jump chain=forward in-interface=ipip- jump-target=change-mss
add action=jump chain=forward out-interface=ipip- jump-target=change-mss

add action=change-mss chain=change-mss comment="change-mss - change TCP MSS - currently set to 1350" new-mss=1350 passthrough=no protocol=tcp tcp-flags=syn tcp-mss=1351-65535
add action=return chain=change-mss comment="change-mss - return - enable if needed - delete if not" disabled=yes

Rule sets for MSS 1330

/ip firewall mangle
add action=jump chain=forward in-interface=ipip- jump-target=change-mss
add action=jump chain=forward out-interface=ipip- jump-target=change-mss

add action=change-mss chain=change-mss comment="change-mss - change TCP MSS - currently set to 1330" new-mss=1330 passthrough=no protocol=tcp tcp-flags=syn tcp-mss=1331-65535
add action=return chain=change-mss comment="change-mss - return - enable if needed - delete if not" disabled=yes

Rule sets for MSS 1300

/ip firewall mangle
add action=jump chain=forward in-interface=ipip- jump-target=change-mss
add action=jump chain=forward out-interface=ipip- jump-target=change-mss

add action=change-mss chain=change-mss comment="change-mss - change TCP MSS - currently set to 1300" new-mss=1300 passthrough=no protocol=tcp tcp-flags=syn tcp-mss=1301-65535
add action=return chain=change-mss comment="change-mss - return - enable if needed - delete if not" disabled=yes

DNS Changer IP Subnets

/ip firewall address-list
add address=85.255.112.0/20 disabled=no list=DNSchanger
add address=67.210.0.0/20 disabled=no list=DNSchanger
add address=93.188.160.0/21 disabled=no list=DNSchanger
add address=77.67.83.0/24 disabled=no list=DNSchanger
add address=213.109.64.0/20 disabled=no list=DNSchanger
add address=64.28.176.0/20 disabled=no list=DNSchanger

Web proxy blocking IP based URLs

I had a customer today tell me that their Barracuda web filter is the only device they've found to date that can do IP based URL blocking. He said he knows Fortinet and Sonicwall can't do it, and Palo Alto said they might be able to. The proxy access rule below for the Mikrotik does just that:

/ip proxy access
add action=deny dst-host=":([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})"

Writing files in RouterOS

Source

Notes:

  • While you can fetch and read the contents of any file, you are limited to working with 4096 character files as this is a limitation on the amount of information that can be contained in a string variable in RouterOS at this time.
  • When creating new files in RouterOS via terminal the extension .txt will be appended to anything that doesn’t already have .txt at the end.
  • You can work with newlines \n\r as delimeters (which is super helpful when downloading something list of IP addresses from somewhere)
The basic commands for working with a file, using variables in place of static content or file names:
1. To create a new file
/file print file=$filename

2. To read an existing file
:set $filedata [/file get $filename contents]

3. To write to an existing file
/file set $filename contents=$newdata

4. To append to an existing file
/file set $filename contents=([get $filename contents] . $newdata)
Back to top