using eth0, eth1

lothario · 07-11-2009, 08:13 PM

On this Ubuntu system, there are 2 network cards:

eth0
192.168.2.15 = ip address
192.168.2.1 = gateway
a.b.c.d = WAN ip address

eth1
192.168.5.25 = ip address
192.168.5.1 = gateway
e.f.g.h = WAN ip address

In the past, when I ssh into one of our remote systems, I would
ssh me@ourRemoteSystem1.com
and there it would show that I was logging in from our a.b.c.d = WAN ip address

But now, when I ssh into one of our remote systems, I still
ssh me@ourRemoteSystem1.com
and now it shows that I was logging in from our e.f.g.h = WAN ip address

Both eth0 and eth1 have been around for a while...
Now it is using eth1 as the gateway/route.

I need to ssh me@ourRemoteSystem1.com
from our a.b.c.d = WAN ip address
How can I do that?

jschiwal · 07-11-2009, 08:26 PM

Did your default route setting change? What are the two gateway addresses for? You could add a route or even a host route so that the correct gateway is used.

lothario · 07-11-2009, 08:55 PM

Quote:

Originally Posted by jschiwal

Did your default route setting change? What are the two gateway addresses for? You could add a route or even a host route so that the correct gateway is used.

No, the default route setting did not change.

This is the "/etc/network/interfaces" file:

Code:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet static
address 192.168.5.25
netmask 255.255.255.0
gateway 192.168.5.1

There are 15 hosts are on the 192.168.2.* network

Recently, one host was added on the 192.168.5.* network

So now there are 2 hosts on the 192.168.5.* network.
Which means now there is some network traffic on the 192.168.5.* side and
with the above explicit "gateway 192.168.5.1" statement - could that be the cause of the different default gateway?

jschiwal · 07-12-2009, 12:52 AM

Enter the /sbin/route command. What is the default gateway? The one for the 0.0.0.0 network?

lothario · 07-12-2009, 01:19 AM

Quote:

Originally Posted by jschiwal

Enter the /sbin/route command. What is the default gateway? The one for the 0.0.0.0 network?

There are 2 default gateways.

Code:

default         192.168.5.1     0.0.0.0         UG    100    0        0 eth1
default         192.168.2.1     0.0.0.0         UG    100    0        0 eth0

jschiwal · 07-13-2009, 04:44 AM

If you want the gateway to be 192.168.2.1 on eth0, then I think you want to remove the "gateway 192.168.5.1" line from the interfaces file. I believe you will still have a route for the 192.168.5.0 network.
The 192.168.2.1 default gateway is being set by the DHCP client.