Running DHCPv6 relay without interfaces
clists at buxtonfamily.us
Thu Mar 14 17:10:19 UTC 2013
On Mar 14, 2013, at 6:40 AM, Peter Rathlev wrote:
> On Thu, 2013-03-14 at 08:56 -0400, Neff, Glen wrote:
>> This makes no sense. If you don't have multiple interfaces, then you
>> shouldn't need a relay.
> I disagree that relay with only one interface doesn't make sense. If the
> DHCP server is not connected to the local LAN you need something to
> forward the requests. The relay agent just receives a broadcast (or
> multicast for IPv6) packet and converts it to a unicast packet.
> For DHCPv6 you could also route the FF02::1:2 address to the DHCP server
> but that would require L3 multicast routing.
I believe the correct address for site-wide routing of the request would be FF05::1:2, not FF02::1:2. Multicast routing is something that should be implemented in an IPv6 world.
Another option would be to join the entire site into a single IPv6 vlan (separate from the smaller IPv4 vlans) and put the DHCPv6 server directly on that vlan. No broadcast can mean larger vlans in an IPv6 world.
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