Partner Down State

[Gregory Sloop]

Hi 

I am operating two ISC DHCP servers as active/backup.
However during an outage I would like to operate the backup server in "partner down" state so that it can utilize all the IP's.Any suggestion how can I manually place the backup server in partner down state.I have checked there is a script that can be used but that's not working for me will appreciate it someone can help me out here.


Regards, 
Waqas Asghar


There's a new option in, IIRC, 4.2.0+ "auto partner down" that should do what you want.
However, be *very* careful with it. There are reasons that the partners might not be able to reach each other, and thus not really be down - and both servers will then assume they have the whole IP block to lease from and will be issuing duplicate leases all over the place. As you can imagine, this would be a very bad(tm) situation. So, use it carefully and consider things carefully.

There's also another option that is also in 4.2.0+ that will allow the remaining partner to "rewind" leases issued by the partner and "re-lease" them - thus giving the remaining partner a lot more endurance. It's also a lot safer than the "auto partner down" directive. 

From the release notes for 4.2.0a1
---
- An optimization described in the failover protocol draft is now included,
  which permits a DHCP server operating in communications-interrupted state
  to 'rewind' a lease to the state most recently transmitted to its peer,
  greatly increasing a server's endurance in communications-interrupted.
  This is supported using a new 'rewind state' record on the dhcpd.leases
  entry for each lease.
---

HTH

-Greg
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