On Tue, Oct 23, 2012 at 05:14:15PM +0200, Christoph Pleger wrote:
> > Are you have real tagged vlan interfaces or by vlan you mean an interface
> > aliases (where multiple IP exists on one interface)?
>
> I have real VLAN interfaces, but one of these interfaces has two IPs
> (there are two Vservers in that subnet).
For real vlans all should be fine without a special configuration. For
example, i have a dhcp server with many tagged vlans:
~# ip a
....
4: vlan23@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
inet 10.16.23.2/24 scope global vlan23
5: vlan24@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
inet 10.16.24.2/24 scope global vlan24
6: vlan25@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
inet 10.16.25.2/24 scope global vlan25
....
~# ip -d link
....
4: vlan23@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
vlan id 102 <REORDER_HDR>
4: vlan24@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
vlan id 103 <REORDER_HDR>
4: vlan25@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT
link/ether 18:03:73:73:03:14 brd ff:ff:ff:ff:ff:ff
vlan id 104 <REORDER_HDR>
....
~# ip rou
....
10.16.23.0/24 dev vlan23 proto kernel scope link src 10.16.23.2
10.16.24.0/24 dev vlan24 proto kernel scope link src 10.16.24.2
10.16.25.0/24 dev vlan25 proto kernel scope link src 10.16.25.2
....
Thus, all routing related to these interfaces should work fine. If
you have a multiple IP on a single interface, all routing must be
fine in this case too, because you have device routes like above ones(for
vlan23, vlan24, vlan25). If you create separate routing tables you must
duplicate to it the same device routes as you have in main for these
interfaces or/and play with src option.
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