My inquire is I am trying to understand why this works.
I have 4 internal routers (2620) connecting directly to a switch (2900XL) the switch is directly connected to a server running OpenBSD 3.9. The server has 2 NICs it is setup as a bridge. The NIC_1 on the server is directly connected to Switch 2900XL. NIC_2 is directly connected to a router the outer_router. The network between the routers, Switch, and NIC_1 on the server is 10.10.100.0/24. NIC_2 and the outer_router are using 10.10.200.0/24.
The internal routers default gateway is set to the switch 2900XL
The switch 2900XL default gateway is set to NIC_1 on the server OpenBSD
The server's default gateway is set to the outer_router
There is no blocking or security setup on this test network. The Bridge is setup to look at all traffic coming from NIC_1 and NIC_2
Now my question is this, when the routers are set to use the switch as the default gateway, I am unable to ping the outer_router. I am thinking the switch that the routers are in should know where the outer_router is because the switches gateway is NIC_1 on the server and the server knows where the outer_router is.
When I set the default gateway of the internal routers to NIC_1 on the server, I am able to ping the outer_router just fine. The traffic must pass thru the switch, the only thing I changed is the default gatway of the inner routers. If I use the switch as the default gateway on the inner routers I cannot ping the outer_router. If I use NIC_1 on the server as the default gateway on the inner_routers I can ping the outer_router. I am puzzled as there is no routing protocol being used just a straight static IP setup.
The Server is setup as bridge to allow traffic to pass from one network to other network. No routing is done by the Server. This is done to watch different going from network 1 to network 2 and vice versa.
Now I see where my error was, thinking that switch would know where to send packets because its default gateway is NIC_1 on the server. Now that you made that clear the switch would not know how to send requests from the inner_routers to NIC_2 on the server.
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