moving devices behind dhcp relay
itlistuser at rapideye.de
Thu Mar 23 14:08:50 UTC 2006
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
> 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
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
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