11.3: Problem with two network interfaces

English Network/Internet
1

Hi,
I have upgraded a file server from opensuse 11.1 to 11.3.
The server has two network interfaces on the same subnet:
192.168.8.20/24 and 192.168.8.21/24

When both interfaces are “up”, the network connection gets “stuck” every few seconds. e.g. ping runs for 3 rounds and then stops. After a few seconds, it continues.

As soon as I disable one interface, e.g. “ifdown eth1”, then it works fine.
After “ifup eth1”, it again gets stuck every few seconds.

The same hardware and configuration was used under 11.1 without any problems.

Any ideas?

Thanks
Andi

2

I suspect it can’t decide which interface to return the ping on. Is there any reason to have two interfaces on the same subnet? Are they both connected to the same network? You could try setting one interface as the default route

ip route replace default via dev eth0

If you want load sharing on the server you should set them up as a bonded interface.

3

Apart from the above help, I would like to know what you mean by “upgrade from 11.1 to 11.3”. Do you mean this loosely as in: I have upgraded by installing 11.3 on the system which was 11.1 and keeping my /home partition. Or do you mean by using the Upgrade option offered early in the install process? The last option is not favored by most here (at least from 11.1 and earlier to 11.3) and it could give strange side effects.

4

I used the Upgrade option and did it in two steps. 11.1 -> 11.2 and then 11.2 -> 11.3

5

The server has two network interfaces on the same subnet:
192.168.8.20/24 and 192.168.8.21/24

Just to get this right: These two NIC’s are not on the same subnet. They are on two different Class C subnets (which is a good thing).

Can you please post the results of these commands:

/sbin/ifconfig -a

/sbin/route -n

and tell us where the two NIC’s are connected to?

6

@vodoo I think you made a little mistake:

Netmask:   255.255.255.0 = 24    11111111.11111111.11111111 .00000000
Wildcard:  0.0.0.255             00000000.00000000.00000000 .11111111
=>
Network:   192.168.8.0/24        11000000.10101000.00001000 .00000000 (Class C)
Broadcast: 192.168.8.255         11000000.10101000.00001000 .11111111
HostMin:   192.168.8.1           11000000.10101000.00001000 .00000001
HostMax:   192.168.8.254         11000000.10101000.00001000 .11111110
Hosts/Net: 254                   (Private Internet)

My conclusion, both are in the same class C network