[lvs-users] lvs masq response package not getting picked up

Graeme Fowler graeme at graemef.net
Mon Aug 13 13:11:14 BST 2012

On Mon, 2012-08-13 at 13:54 +0200, Klavs Klavsen wrote:
> Appearently they are going through FORWARD - with the source IP of the 
> backend - instead of the sourceIP of the VIP - that the client actually 
> accessed.

You're using LVS-NAT. The only place the VIP is present in the usual
usage of this is in the external (client-facing) interface of the

> Also - for some reason there's no state - so I had to allow ALL packages 
> with source-port of 80 or 443 in the FORWARD chain.

ipvs works in tandem with netfilter (is part of it nowadays,
effectively), so state is recorded in the usual way in the conntrack
tables. If yours isn't, then you may be using an old enough kernel that
this doesn't happen or you don't have the appropriate netfilter modules


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