Re: Bridging interfaces

On Sat, Sep 29, 2007 at 09:49:36PM -0600, Simon Timms wrote:
That makes a lot of sense, but I suppose I still don't understand why this
isn't working. The handbook section on routing is pretty basic and it seems
to come down to setting net.inet.ip.forwarding to 1 if you want to route
packets between interfaces on a dual-homed host. I'm able to reach hosts on
both subnets from the router and my routing table looks like:

Internet:
Destination Gateway Flags Refs Use Netif
Expire
default wireless UGS 0 9905
sis0
localhost localhost UH 0 134
lo0
192.168.1 link#1 UC 0 0
sis0
orinoco 00:d0:09:f8:f7:5a UHLW 1 268 lo0
192.168.1.255 ff:ff:ff:ff:ff:ff UHLWb 1 87
sis0
192.168.2 link#2 UC 0 0
rl0
192.168.2.255 ff:ff:ff:ff:ff:ff UHLWb 1 87
rl0

Are your 192.168.2/24 machines configured to use 192.168.2.2 as their
default router? They don't know where 192.168.1.2 is, because they
don't see it as being on the same link. The subnet mask is used to
determine this kind of reachability.

You could probably use 192.168.1.2 as your default router, as long as
you created a static route `route add 192.168.1/24 192.168.2.2', telling
the system that to get to 192.168.1/24, the next-hop is 192.168.2.2.
This seems needlessly complex when you can just configure 192.168.2.2 as
your default router and skip the static route configuration all
together.

Regardless, bridging isn't going to help unless the host and the default
router have the same subnet configurations.

--
Chris Cowart
Lead Systems Administrator
Network & Infrastructure Services, RSSP-IT
UC Berkeley

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