Routing question
Ken D'Ambrosio
kena at well.com
Fri May 9 13:10:42 EDT 2003
Paul: ain't no such thing as two default gateways on a box if it isn't
either running some sort of routing protocol, or has the ability to do
policy-based routing. Check out iproute2; it gets fairly weird, but
there's a pretty good book out there, as well as several sites and FAQs.
-Ken
> Hi all,
>
> I've got a system with 2 NICs in it on 2 separate subnets.
> (Yes Ben, both networks have active routers on them for gateways :)
>
> My config files look like this:
>
> DEVICE=eth0 DEVICE=eth3
> ONBOOT=yes ONBOOT=yes
> BOOTPROTO=none BOOTPROTO=none
> IPADDR=10.241.35.18 NETWORK=10.241.37.0
> NETMASK=255.255.255.0 IPADDR=10.241.37.70
> NETWORK=10.241.35.0 NETMASK=255.255.255.0
> BROADCAST=10.241.35.255 BROADCAST=10.241.37.255
> GATEWAY=10.241.35.1 GATEWAY=10.241.37.1
>
> With my config files like this, I get:
>
> # netstat -rn
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt
> Iface 10.241.35.0 0.0.0.0 255.255.255.0 U 40 0
> 0 eth0 10.241.37.0 0.0.0.0 255.255.255.0 U 40 0
> 0 eth3 127.0.0.0 0.0.0.0 255.0.0.0 U 40 0
> 0 lo 0.0.0.0 10.241.35.1 0.0.0.0 UG 40 0
> 0 eth0
>
> With this configuration, everything *should* route out eth3, however, I
> can't seem to get this to work properly. One NIC responds, but not the
> other. In this case, eth0 reponds to pings from off these subnets (i.e.
> if I ping from 168.159.31.9), but not eth3.
>
>
> If I add a second default route for the .37 subnet, like this:
>
> # netstat -rn
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt
> Iface 10.241.35.0 0.0.0.0 255.255.255.0 U 40 0
> 0 eth0 10.241.37.0 0.0.0.0 255.255.255.0 U 40 0
> 0 eth3 127.0.0.0 0.0.0.0 255.0.0.0 U 40 0
> 0 lo 0.0.0.0 10.241.37.1 0.0.0.0 UG 40 0
> 0 eth3 0.0.0.0 10.241.35.1 0.0.0.0 UG 40 0
> 0 eth0
>
> I then get no response from either NIC.
> Note, I am not trying to get this system to actually route, I just want
> to be able to get to either NIC from off those subnets.
>
> Any idea what I'm missing?
>
> Thanks,
> --
>
> Seeya,
> Paul
> --
> Key fingerprint = 1660 FECC 5D21 D286 F853 E808 BB07 9239 53F1 28EE
>
> It may look like I'm just sitting here doing nothing,
> but I'm really actively waiting for all my problems to go away.
>
> If you're not having fun, you're not doing it right!
>
>
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