Andrew Morton wrote:
On Fri, 25 Jan 2008 03:59:27 -0800 (PST) [EMAIL PROTECTED] wrote:
http://bugzilla.kernel.org/show_bug.cgi?id=9812
Problem Description:
I have a farm of web servers behind a load balancer in DSR mode.
I would like to be able to dump packets with any IP address on the web servers
through the load balancer and have web servers reply to these requests.
Currently for every IP web servers are supposed to reply to, I have to
configure the IP on all servers on their loopback interfaces. The web server
listens on IN_ADDR_ANY and I am forcing packets into the INPUT chain via
iptables/netfilter but the kernel never replies to any connection requests. I
only see the counter for OutNoRoutes increasing.
Steps to reproduce:
web server:
#iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 80 -j MARK --set-mark
1
#ip route add to local default dev lo protocol kernel table 1
#ip rule add fwmark 1 table 1 priority 1
client:
#ip route add 1.1.1.1/32 via <web server IP> dev eth0
while making requests to 1.1.1.1:80 from the client you can see increasing
OutNoRoutes counter but no connection ever takes place.
I already commented in bugzilla, this is not a bug but an incorrect
setup. DNAT or REDIRECT must be used to make this work properly.
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