Default gateway on SLES11sp1 with 2 NIC's

Hi,

In the server I have 2 NIC’s configured to connect to 2 different VLAN’s. I have set up several VM’s connecting to either of the interfaces. This is all working correctly.
The issue I am having is trying to set a default gateway to each physical interface.

Eth0 10.1.1.10 VLAN1 Br0 and the gateway should be 10.1.1.1
Eth1 10.2.2.10 VLAN2 Br1 and the gateway should be 10.2.2.1

From the server I can ping each interface, and any device on both subnets, but nothing on any other remote subnet.

If I am on the 10.1.1.0 network I can ping all the VMs and the 10.1.1.10, but not the 10.2.2.10
If I am on the 10.2.2.0 network I can ping all the VMs and the 10.2.2.10, but not the 10.1.1.10

The “route” command returns the following:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.1.1.0 * 255.255.255.0 U 0 0 0 br0
10.2.2.0 * 255.255.255.0 U 0 0 0 br1
loopback * 255.0.0.0 U 0 0 0 lo

I need to configure a default gateway for each interface, without bridging the network.
Any ideas or help would be great.
Regards
John

On 24/08/2012 10:44, John Gill wrote:
[color=blue]

In the server I have 2 NIC’s configured to connect to 2 different
VLAN’s. I have set up several VM’s connecting to either of the
interfaces. This is all working correctly.
The issue I am having is trying to set a default gateway to each
physical interface.

Eth0 10.1.1.10 VLAN1 Br0 and the gateway should be 10.1.1.1
Eth1 10.2.2.10 VLAN2 Br1 and the gateway should be 10.2.2.1

From the server I can ping each interface, and any device on both
subnets, but nothing on any other remote subnet.

If I am on the 10.1.1.0 network I can ping all the VMs and the
10.1.1.10, but not the 10.2.2.10
If I am on the 10.2.2.0 network I can ping all the VMs and the
10.2.2.10, but not the 10.1.1.10

The “route” command returns the following:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
10.1.1.0 * 255.255.255.0 U 0 0
0 br0
10.2.2.0 * 255.255.255.0 U 0 0
0 br1
loopback * 255.0.0.0 U 0
0 0 lo

I need to configure a default gateway for each interface, without
bridging the network.
Any ideas or help would be great.[/color]

From the above route output you don’t appear to have configured a
default gateway for the server.

You can do this with YaST - Network Devices | Network Settings | Routing
| Default Gateway - or via route - route add default gw

HTH.

Simon
Novell/SUSE/NetIQ Knowledge Partner


Do you work with Novell technologies at a university, college or school?
If so, your campus could benefit from joining the Novell Technology
Transfer Partner (TTP) program. See novell.com/ttp for more details.

Hi Simon,

That is the issue. I can set a default gateway of 10.1.1.1 for the
10.1.1.10 subnet, but what about the second NIC on the other subnet?

Regards
John

[color=blue][color=green][color=darkred]

On 24 August 2012 at 14:37, in message[/color][/color][/color]
AAKZr.4294$If2.3065@kovat.provo.novell.com, Simon
Floodsmflood@no-mx.forums.suse.com wrote:[color=blue]
On 24/08/2012 10:44, John Gill wrote:
[color=green]

In the server I have 2 NIC’s configured to connect to 2 different
VLAN’s. I have set up several VM’s connecting to either of the
interfaces. This is all working correctly.
The issue I am having is trying to set a default gateway to each
physical interface.

Eth0 10.1.1.10 VLAN1 Br0 and the gateway should be 10.1.1.1
Eth1 10.2.2.10 VLAN2 Br1 and the gateway should be 10.2.2.1

From the server I can ping each interface, and any device on both
subnets, but nothing on any other remote subnet.

If I am on the 10.1.1.0 network I can ping all the VMs and the
10.1.1.10, but not the 10.2.2.10
If I am on the 10.2.2.0 network I can ping all the VMs and the
10.2.2.10, but not the 10.1.1.10

The “route” command returns the following:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
10.1.1.0 * 255.255.255.0 U 0 0
0 br0
10.2.2.0 * 255.255.255.0 U 0 0
0 br1
loopback * 255.0.0.0 U 0
0 0 lo

I need to configure a default gateway for each interface, without
bridging the network.
Any ideas or help would be great.[/color]

From the above route output you don’t appear to have configured a
default gateway for the server.

You can do this with YaST - Network Devices | Network Settings | Routing
| Default Gateway - or via route - route add default gw

HTH.[/color]

On 24/08/2012 14:17, John Gill wrote:
[color=blue]

That is the issue. I can set a default gateway of 10.1.1.1 for the
10.1.1.10 subnet, but what about the second NIC on the other subnet?[/color]

When you set a default gateway you’re doing so for the server not a
particular NIC.

If you’re using YaST you should see below the default gateway field that
you can also add (or delete) additional routes - that’s where you could
set “default” gateways per NIC.

HTH.

Simon
Novell/SUSE/NetIQ Knowledge Partner


Do you work with Novell technologies at a university, college or school?
If so, your campus could benefit from joining the Novell Technology
Transfer Partner (TTP) program. See novell.com/ttp for more details.

I have tried setting the routes in the “routing table” but that does not
seem to help.

Perhaps if I pose the question differently :wink:
How do I configure the networking so that a packet received on 10.1.1.10 is
returned thru its gateway address of 10.1.1.1 and if a packet is received on
10.2.2.10 is returned via that it’s gateway of 10.2.2.1

Maybe some policy based routing or multiple default routes. I found two
TIDS 7009083 and 7008874 that sort of explain the solution but the docs are
not totally accurate or I cannot get them to work.

Regards
John.

[color=blue][color=green][color=darkred]

On 24 August 2012 at 16:04, in message[/color][/color][/color]
6SLZr.4310$If2.4105@kovat.provo.novell.com, Simon
Floodsmflood@no-mx.forums.suse.com wrote:[color=blue]
On 24/08/2012 14:17, John Gill wrote:
[color=green]

That is the issue. I can set a default gateway of 10.1.1.1 for the
10.1.1.10 subnet, but what about the second NIC on the other subnet?[/color]

When you set a default gateway you’re doing so for the server not a
particular NIC.

If you’re using YaST you should see below the default gateway field that
you can also add (or delete) additional routes - that’s where you could
set “default” gateways per NIC.

HTH.[/color]

John Gill wrote:
[color=blue]

How do I configure the networking so that a packet received on
10.1.1.10 is returned thru its gateway address of 10.1.1.1 and if a
packet is received on 10.2.2.10 is returned via that it’s gateway of
10.2.2.1[/color]

Hi John,

Here’s another TID to check:
http://www.novell.com/support/kb/doc.php?id=7000318


Kevin Boyle - Knowledge Partner
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