Alias IP

[Frank Bulk]

Zachar:

Have you considered applying the virtual IP as a an alias interface (eg.
eth0:0) to the live node, and then when failing over, move the alias
interface to the failover node?  And combine that with the local-address
directive?  That way incoming and outgoing IPs are all the virtual IP.  

I saw your other response: don't you want all your DHCP traffic coming in on
your virtual IP?

Regards,

Frank

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
Of Zachár Balázs
Sent: Monday, November 20, 2006 8:12 AM
To: dhcp-users at isc.org
Subject: Alias IP

Hello @list!

I have the following problem:

active/passive cluster with one virtual IP address...

A node real IP: 192.168.1.2
B node real IP: 192.168.1.3
virtual common IP: 192.168.1.5

So I have an alias IP address in my interface. The dhcp requests come to
the alias IP (192.168.1.5) but the offers going out on the real
interface IP (e.g. 192.168.1.2).
Maybe the problem:
If I give an IP with my real interface, and before the client would like
to renew his IP address the cluster is failover, the dhcpd's IP address
will change... But if I send the offers trough the alias interface, If
the cluster fail over the IP address is still the same (the virtual IP)...

Can I send the offers with my alias interface?