upgrade 3.0.5 -> 4.1.1 due to lease imbalance

[sthaug at nethelp.no]

> I`m going upgrade dhcpd to dhcp-4.1.1-22.P1.fc13.x86_64 and 2 stupid questions (sorry):
> 
> 1. Are dhcpd.conf and dhcpd.leases files compatible yet? (3.0.5 -> 4.1.1)

Yes.

> 2. Can I run failover with 4.1.1 on primary and 3.0.5 on secondary for 5-10 hours to prevent network outages? (70 000 - 90 000 leases)

No. The failover protocol implementation has changed, a 3.0.5 host will
not interoperate with a 4.1.1 host.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no