Wireless Networks Thread, DHCP Redundancy in Technical; Hi.
We've got a second server here setup to do AD & DNS redundancy, and ive been trying to do ...
1st July 2008, 12:14 PM #1
1st July 2008, 12:25 PM #2
Windows DHCP failed miserably in this regard for me also. I'm using ISC DHCPd with failover on Linux machines now instead.
Failover with ISC DHCP
1st July 2008, 12:30 PM #3
1st July 2008, 12:32 PM #4
It took me 12 hours of not getting it to work on Windows. It took me 2 hours of setting up on *nix. Was a no brainer.
1st July 2008, 12:35 PM #5
It is a good question - why isn't redundancy on DHCP straight forward? What about Windows Server 2008; does this support DHCP redundancy?
1st July 2008, 12:36 PM #6
it wont, server 2 will know that the ip address is valid and so wont attempt to renew it. i think once it's expired then server 2 will dish it out an ip from its range.
1st July 2008, 12:39 PM #7
- Rep Power
So when server 1 has no more addresses to hand out, server 2 will pick up the rest?
Thats a bit messed up, as theres no redundancy there?
1st July 2008, 12:39 PM #8
Aye ive got it setup like that as well. Took me longer to figure out how to get the two servers times in sync for dhcp failvoer to work than it did to configure dhcp failover ;p
Originally Posted by Geoff
1st July 2008, 12:46 PM #9
NTP is one of the first things I install on new *nix servers.
1st July 2008, 12:53 PM #10
it was the timezone I had set wrong on one of them. Had it set for just GMT rather than the london zone, so it was exactly 1 hour out.
1st July 2008, 12:54 PM #11
1st July 2008, 01:01 PM #12
nooo... Pc1 will try to renew it's ip, server2 will look at its request and dismiss it as valid. When pc1's ip expires it then looks for a new ip, which it will receive from server2.
Originally Posted by boomam
1st July 2008, 01:06 PM #13
- Rep Power
The first link is basically describing what im doing, having one server serve one half of a scope and the other server serving the other half.
Originally Posted by bossman
Not too keen on using 3rd party software to do something that afaik, should work anyway?
So even if ive switched off DHCP on server 1 it wont work?
Originally Posted by strawberry
Thats a bit rubbish, as surely the entire point of redundancy is to provide that facility when the 'main' part isnt functioning.
1st July 2008, 01:16 PM #14
kinda works for me, It'll ensure that you always have a valid working ip address and if server 1 comes backonline before the end of the lease it can pick up where it's left off.
1st July 2008, 01:24 PM #15
We've got it working on Windows here - but instead of excluding half the range, each DHCP server is only set to serve half the range each. We find it load balances perfectly.
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