Alias IP

[Zachár Balázs]

Frank Bulk írta:
> 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? 

Yes
>  And combine that with the local-address
> directive? 

Yes
>  That way incoming and outgoing IPs are all the virtual IP.  
>   

No, Because, default if you have an alias IP on your physically int.  
the incoming packets can come in the alias IP but the outgoing packets 
every time  go out on the real interface...
> I saw your other response: don't you want all your DHCP traffic coming in on
> your virtual IP?
>   

I would like to all dhcp traffic  come  and go on my virtual IP... 
Because  the clients are an other VLAN and there is an ip helper address 
command on the router interface and because some other reason (firewall)...


Thx,
Balázs

> 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?
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