moving devices behind dhcp relay
Sebastian Reitenbach
itlistuser at rapideye.de
Thu Mar 23 14:08:50 UTC 2006
Hi,
dhcp-users at isc.org wrote:
> Sebastian Reitenbach wrote:
>
> >I want to setup some linux clients with a physical interface and a vlan
> >interface. In linux the vlan interface has the same mac address as the
> >physical one. for the vlan, a dhcp-relay is configured to route the dhcp
> >request to the server. is the dhcpd able give different ip addresses to the
> >physical interface and the vlan interface despite they have the same mac
> >address?
>
> So you want to use the real interface (eg eth0) as well as a separate
> VLan interface (eg eth0.123) at the same time ?
>
> From my understanding of how the system works, I'm not sure you can
> do it at all. How, for example, does the switch know the difference
> between a tagged and untagged packet ? All the switches I've worked
> with can have a port either tagged or untagged, not both at the same
> time.
yes, the switch can do that, it makes all untagged packets in vlan1 and all
tagged packets stay in their tagged vlan.
>
> If you do get around that, then DHCP can deliver two addresses if
> asked for them. You will need to get the dhcp client to request an
> address for each interface, and assuming that the logical interfaces
> are in different subnets, I think you'll find that having the same
> MAC address won't matter.
ok, sounds great, as it is exactly as I want it.
thanks a lot
Sebastian
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