I'm trying to bridge 2 networks

  • one using SonicWall NSA240 (
  • one using Cisco 1940 (

Both are working as DHCP servers on their networks. I want to access machines on the 129-network from the 100-network

I plugged the 129-network into X4 on the Sonic Wall.

X4 interface is configured with a static IP ( and I added a route:

source: X0 subnet (lan) destination: X4 subnet ( service: any gateway: what should I use here? (which is the cisco address)? interface: X3

It doesn't work, I can't ping any 129 adresses from the 100-network. What did I miss?

  • I don't think you really want to bridge two networks with different addresses. You probably want to route between them. Routers get routes in three ways: directly connected, statically configured, or through a routing protocol. Don't configure gateways on routers which are routing; the routers are the gateways.
    – Ron Maupin
    Sep 19, 2016 at 14:14
  • yes that's probably what I meant
    – Remi Pou
    Sep 20, 2016 at 7:18
  • Since you have resolved the problem, please post an answer and accept it so that the question doesn't keep popping up forever, looking for an answer.
    – Ron Maupin
    Jan 17, 2017 at 15:43
  • RESOLVED: just had to change Link speed from Auto Negotiate to 100 Mbps - Full Duplex @RonMaupin
    – Remi Pou
    Jan 18, 2017 at 9:05
  • Right, you resolved it, but please put it in as an answer, and accept the answer.
    – Ron Maupin
    Jan 18, 2017 at 14:57

1 Answer 1


You should not need to add a route on the Sonicwall, as it already has a connected route when you give it an ip address in that subnet. (Edit: well maybe you do, I have no idea how a Sonicwall works but generically speaking if it acts as a router, you shouldn't).

What you do need is to make sure that the 192.168.129.x network can reach the 192.168.100.x network. So you should either:

  • add a static route on each host in 192.168.129.x, for with as next-hop

  • add a static route on the cisco, for with as next-hop

  • reconfigure your dhcp to give out as default gateway (but then obviously all Internet access will go through the Sonicwall as well so you no longer use the Cisco).

Edit: And as Ron pointed out, you mis-used the term 'bridging', you connected the 2 LANs using a firewall/router, so you are routing between them, you'r not bridging them.

  • Thank you, @hertitu. I do understand that it should be so. I think I'm having a sonicwall related issue. Although I gave it a fixed IP (, I can't ping it from the 129-network. I'm also new to SonicWall, I'm gonna do some research...
    – Remi Pou
    Sep 20, 2016 at 7:25
  • RESOLVED: just had to change Link speed from Auto Negotiate to 100 Mbps - Full Duplex
    – Remi Pou
    Sep 20, 2016 at 7:44

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