DHCPv4 server and relay at the same time

[Francis Dupont]

> Your dhcp server won't have the same trouble binding that dnsmasq has,
> when the relay is also binding the interface(s)?

=> the ISC DHCP server has the same feature (because it is in the common
I/O code) than the -l4/-l6 of dhccra, so the fallback socket can be
bound to according to lsof:

dhcpd   24825 root    7u  IPv4             166101 \
      0t0     UDP 172.28.0.1:67

> My understanding is that the relay wants to send it's own ip database
> out from a global set, which have to be real on one interface and
> natted on the rest.

=> the relay provides a service on one interface (in fact a set of
interface but the CRA is limited to one by the spec: there is no way
to know to what interface a response has to be forwarded).

> As we now have 6MB worth of isc binaries on a system with room for 4,
> when I thought we only needed 1.5, I'll have to remove some core
> functionality from the cpe, probably the vpn code.

=> IMHO it becomes critical to reduce the ISC DHCP footprint.
I'll send a message about this as it is not technical only.

> Cruithne is my personal laptop and went home with me last night.

=> it has a 1:1 resonating orbit with you (:-).

> It would be helpful to leave a client (someone elses laptop) in place 24/7.

=> yes, I'll need it once to verify the DHCPv4 service on ida is
correct.

Thanks

Francis Dupont <fdupont at isc.org>

PS: if you assist to the (still not in the agenda) conf call this night
(for me, I am 8 hours in front) you can explain how to pronounce cruithne