manual routing between two remote subnets ---- a perfect answer to need add a route back to the source

manual routing between two remote subnets ---- a perfect answer to need add a route back to the source


here is the secenario

192.168.1.x -- HO

192.168,2,x -- remote branch subnet

between these two subnet , there is a site-to-site setup via two Mako firewalls. Mako is a local vendor.

now their VOIP supplier wants to add a SIP trunk attached to the HO network

192.168.1.x -- -- 192.168.1.20 --CISCO router --- 10.x.x.x PABX

I am told by the VOIP vendor, to add a route to 10.x.x.x netowork


I added a static route to 10.x.x.x witjh 192.168.1.20 a gateway

and I did the switch-over with the PABX guy

the 192.168.1.x seems all good

but the phones in the 192.168.2.x not working. as the phones looking for the new pabx location.

eventually called the VOIP vendor to add a route back to 192.168.2.x in their CISCO router

after some argument, they did it, all problem sorted.


lession learned: you add the route to the destination and you also need add a route back to the source