2 NICs, 2 LANs

Hello!

Ich have Suse 10.1 with 2 Networkcards. One Card for a Network 121.120.44.140 nm
255.255.255.192 . The other with 121.120.177.41 nm 255.255.255.192. So these are routeable
ipnumbers on different VLANs.

I cannot setup these cards correctly. I can only have one defaultroute for both networks
(this is correct?). Ip forwarding is disabled...

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
121.120.177.0 0.0.0.0 255.255.255.192 U 0 0 0 eth1
121.120.44.128 0.0.0.0 255.255.255.192 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 121.120.44.129 0.0.0.0 UG 0 0 0 eth0


I cannot reach 121.120.177.41 from outside and I cannot reach any 121.120.177.x hosts.

Any help?

-jere

Joe Jerome wrote:
> Hello!
>
> Ich have Suse 10.1 with 2 Networkcards. One Card for a Network 121.120.44.140 nm
> 255.255.255.192 . The other with 121.120.177.41 nm 255.255.255.192. So these are routeable
> ipnumbers on different VLANs.
>
> I cannot setup these cards correctly. I can only have one defaultroute for both networks
> (this is correct?). Ip forwarding is disabled...
>
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt Iface
> 121.120.177.0 0.0.0.0 255.255.255.192 U 0 0 0 eth1
> 121.120.44.128 0.0.0.0 255.255.255.192 U 0 0 0 eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> 0.0.0.0 121.120.44.129 0.0.0.0 UG 0 0 0 eth0
>
>
> I cannot reach 121.120.177.41 from outside and I cannot reach any 121.120.177.x hosts.

Three things that spring to mind:
- You need to have IP forwarding enabled to reach 121.120.177.x hosts
from outside (by which I presume you mean machines other than "this"
one).
- Do the "outside" hosts know the route to 121.120.177.x?
- Do you have a firewall?

--
Paul

Joe Jerome wrote:
> Hello!
>
> Ich have Suse 10.1 with 2 Networkcards. One Card for a Network
> 121.120.44.140 nm 255.255.255.192 . The other with 121.120.177.41 nm
> 255.255.255.192. So these are routeable ipnumbers on different VLANs.
>
> I cannot setup these cards correctly. I can only have one defaultroute
> for both networks (this is correct?). Ip forwarding is disabled...
>
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt
> Iface
> 121.120.177.0 0.0.0.0 255.255.255.192 U 0 0 0
> eth1
> 121.120.44.128 0.0.0.0 255.255.255.192 U 0 0 0
> eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> 0.0.0.0 121.120.44.129 0.0.0.0 UG 0 0 0
> eth0
>
>
> I cannot reach 121.120.177.41 from outside and I cannot reach any
> 121.120.177.x hosts.
>
> Any help?
>
> -jere

Does the two vlan are routed by an external routers or it' your host
which is router for the second subnet

if first solution you could try echo 1 > net.ipv4.conf.default.rp_filter

it's not the best solution but it's could be work

or as nicest solution go to advanced routing with source routing



for second solution your default gateway should know the route for subnet
behind your server and you need to activate IP forwarding

On Mon, 06 Nov 2006 15:18:56 +0100, Joe Jerome wrote:

> Ich have Suse 10.1 with 2 Networkcards. One Card for a Network
> 121.120.44.140 nm 255.255.255.192 . The other with 121.120.177.41 nm
> 255.255.255.192. So these are routeable ipnumbers on different VLANs.
>
> I cannot setup these cards correctly. I can only have one defaultroute
> for both networks (this is correct?).

Normally yes. If you want to route traffic via multiple links, see:
http://www.tldp.org/HOWTO/Adv-Routin...ple-links.html

--
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