DHCP server failover behind relay
abramm at gmail.com
Thu Sep 6 06:03:46 UTC 2012
2012/9/6 Alex Bligh <alex at alex.org.uk>
> --On 6 September 2012 00:08:48 +0300 Vadym Abramchuk <abramm at gmail.com>
> To simplify the things, here's a short cutoff: 10.0.0.70/24 is a primary
>> DHCP server (running at present), 10.0.0.90/24 is secondary one
>> (actually, it runs in virtual machine). Clients are at different subnet,
>> 10.8.2.0/23. There's a L3 switch routing between subnets (Dell 6024F in
>> this case), 10.0.0.1/24 at one side and 10.8.2.1/23 at another side. The
>> switch acts as a DHCP relay.
> How about run carp or similar on the 2 dhcp servers and use iptables
> on each server with the -j TEE target (from memory) which will duplicate
> the packet and send it to the other server. Clearly you'll want dhcp
> listening on a loopback interface or something with the same IP number
> on each server, and some proxy arp or similar to get the packet there.
You're today's winner! That's exactly what I was looking for. The only part
puzzle I was missing is -j TEE.
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