DHCP Failover questions
Jason Frisvold
frisvolj at lafayette.edu
Fri Nov 13 21:52:15 UTC 2009
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On Nov 13, 2009, at 2:54 PM, sthaug at nethelp.no wrote:
> No. The failover peer "foo" name needs to be the same on primary and
> secondary, and also needs to be the same as the failover peer "foo"
> inside the pool declaration.
>
> Note that you can have multiple failover associations. So for instance
> server A at a main office can have a failover association (e.g. "AB")
> with server B at one branch office, and another failover association
> (e.g. "AC") with server C at a different branch office. Server B would
> have failover peer "AB" inside the pool declaration(s) and also in the
> failover declaration, while server C would have failover peer "AC"
> inside the pool declaration(s) and in the failover declaration.
>
> When the servers in a failover pair are communicating, you should expect
> to see messages along the following lines in the logs:
>
> Restarting one server, messages on this server:
>
> Nov 13 06:56:10 dhcp2 dhcpd: failover peer dhcp1-dhcp2: I move from normal to startup
> Nov 13 06:56:11 dhcp2 dhcpd: failover peer dhcp1-dhcp2: peer moves from normal to communications-interrupted
> Nov 13 06:56:11 dhcp2 dhcpd: failover peer dhcp1-dhcp2: I move from startup to normal
> Nov 13 06:56:11 dhcp2 dhcpd: failover peer dhcp1-dhcp2: peer moves from communications-interrupted to normal
Interestingly enough, we do see these messages..
> and on the other server in the failover pair (you *do* have them NTP
> synchronized, I hope):
Of course. :)
> For the DHCPDISCOVER messages you should expect to see them in the logs
> on both servers, with one of the servers saying "load balance to ...",
> e.g.:
>
> Nov 13 20:49:06 dhcp1 dhcpd: DHCPDISCOVER from 00:1c:df:3f:e6:ca via 81.191.80.1
>
> Nov 13 20:49:06 dhcp2 dhcpd: DHCPDISCOVER from 00:1c:df:3f:e6:ca via 81.191.80.1: load balance to peer dhcp1-dhcp2
Aha .. this is what we're not seeing. I will modify the configuration accordingly during our maintenance window and get this running properly.
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
- ---------------------------
Jason Frisvold
Network Engineer
frisvolj at lafayette.edu
- ---------------------------
"What I cannot create, I do not understand"
- Richard Feynman
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