Re: Some problems with changing source ip.

From: Sarada Seshadri (sarada@ece.iisc.ernet.in)
Date: Thu Apr 26 2001 - 04:40:24 EST


> I am new to Linux networking code and am trying out
> something new for my project.
> I'm basically trying to build a port based Load
> Balancer box. In short i maintain a table of ports and
> then forward whatever request i get to a server whose
> ip i know. But the problem is that i am unable to
> forward a packet with the source ip as the address of
> this machine. I have added code in ip_input.c to do
> this and do a ip_route_input after doing a
> dst_release. It is able to forward the packet if the
> source address is not changed. ( ip_forwarding is
> enabled and i have also run echo 1 >
> /proc/sys/net/ipv4/ip_forward). IP firewalling is also
> enable.
> However when i assign the source address as this
> machine it is not able to forward the packet.

I would suggest that you work in user space rather than
tinkering with the kernel code. This would also provide
scope for novel features in your load balancer.

-Sarada

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