Stetting a dynamic gateway address to a static one

RouterOS Scripting
1

Hi

I’ve a static route set up to a PPPoE tunnel connecting to my ISP as the dynamic route to the ISP does not work/have the correct routing mark associated to it. This works fine until the PPPoE reconnects and the gateway changes.

I’d like to have a script check the dynamic route’s gateway and set my static one to match… so far I have this:

:global list “”; :foreach i in [/ip route find] do={:if ([:find [/ip route get $i gateway] “pppoe-out-adsl”]=0) do={:set list ($list . “,” . $i);}}; /ip route print detail without-paging from $list;

without digging into the details of MT scripting I’m a bit lost, I’m sure someone can help me out easily with this.

many thanks

2

bump

3

Are there just the two routes? Or more? Could you run this and post the results?

/ip route print detail
4

HI

There are lots of routes set up, here are some of the relevant ones:

 0   S  ;;; Match this route to the Dynamic ADSL default route
        dst-address=0.0.0.0/0 gateway=62.5.84.25 
        gateway-status=62.5.84.25 unreachable check-gateway=ping distance=1 
        scope=30 target-scope=10 routing-mark=vicADSL 

 1 X S  dst-address=10.6.1.0/24 gateway=10.6.10.254 
        gateway-status=10.6.10.254 inactive distance=1 scope=30 
        target-scope=10 routing-mark=vicADSL 

 2 X S  dst-address=10.6.11.0/24 gateway=10.6.10.254 
        gateway-status=10.6.10.254 inactive distance=1 scope=30 
        target-scope=10 routing-mark=vicADSL 

 3 A S  dst-address=192.168.2.0/24 pref-src=192.168.2.254 gateway=ether3 
        gateway-status=ether3 reachable distance=1 scope=10 target-scope=10 
        routing-mark=vicADSL 

 4 A S  ;;; RemoteSitesPPtP default route
        dst-address=0.0.0.0/0 gateway=172.20.100.254 
        gateway-status=172.20.100.254 reachable vlan10CorporateData 
        distance=1 scope=30 target-scope=10 routing-mark=RemoteSitesPPtP 

 5 A S  ;;; public guest access
        dst-address=0.0.0.0/0 gateway=214.196.252.44 
        gateway-status=214.196.252.44 reachable bridgehSoGuest distance=1 
        scope=30 target-scope=10 

 6  DS  dst-address=0.0.0.0/0 gateway=62.5.84.23 
        gateway-status=62.5.84.23 reachable pppoe-out-adsl-zen distance=1 
        scope=30 target-scope=10 

 7 ADC  dst-address=62.5.84.23/32 pref-src=32.69.141.118 
        gateway=pppoe-out-adsl-zen 
        gateway-status=pppoe-out-adsl-zen reachable distance=0 scope=10

Route 0 (62.5.84.25) is the one that needs to be set to the gateway in 6 (62.5.84.23) which changes on reconnect

5

This might work, assuming you only have 1 dynamic route where the gateway-status contains the string “reachable pppoe-out-adsl-zen”. First, run this command to check. If it comes back with 1, you’re fine. If it comes back with 2 or more, the script will have to be revised:

:put [ :len [ /ip route find gateway-status~"reachable pppoe-out-adsl-zen" dynamic ] ];

If that checks out ok, then this script should work:

# tested on RouterOS v4.17
# for the route that contains this comment, do the following
:foreach i in [ /ip route find comment~"Match this route to the Dynamic ADSL" ] do={
# get the gateway of the dynamic adsl route
	:local adslGateway [ /ip route get [ find gateway-status~"reachable pppoe-out-adsl-zen" dynamic ] gateway ];
# if the adsl Gateway IP does not match the static gateway IP
	if ( $adslGateway != [ /ip route get $i gateway ] ) do={
# set the static gateway to match
		/ip route set $i gateway=$adslGateway;
	}
}
6

Thanks! that works perfectly on ROS 5.8 :smiley:

7

Broke when I upgraded to ROS 5.18 due to an extra word and space being added to the route detail output text

reachable via  pppoe-out-adsl-zen




6  DS  dst-address=0.0.0.0/0 gateway=62.3.84.21 gateway-status=62.3.84.21 reachable via  pppoe-out-adsl-zen distance=1 scope=30 target-scope=10

modified the script and we’re back up working again…