[lvs-users] ipvs not doing any link balancing

Sivaraman Kannan k.sivaraman at gmail.com
Thu Aug 26 06:46:16 BST 2010

Hi guys
    I have a setup where I have three interfaces on my linux box, one is a
LAN interface and two are connected to the internet and I want to do link
balancing of all packets coming from the LAN onto the two WAN interfaces.

I have configured ipvs to do the link balancing (scheduling is weighted
round-robin) using the following command for each WAN interface:

ipvsadm -a -f <fwmark> -r wan_real_server_ip -z wan_interface -w weight -j

Right now, the behavior is that LVS does not do any link balancing, but only
sends it out of one interface (i think the first interface that came up).
ipvsadm -lnc shows a whole bunch of connections in SYN_RECV state...anything
which came in on the other interface never gets a reply.

If I specify the real server IP as the WAN gateway instead of the interface
IP itself, it works but I really need this scenario to work. Any
suggestions? Do you need more information? Please let me know. Thanks!


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