Re: LVS-DR UDP Service probem

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: LVS-DR UDP Service probem
From: Horms <horms@xxxxxxxxxxxx>
Date: Mon, 23 Aug 2004 11:53:21 +0900
On Fri, Aug 20, 2004 at 11:00:58AM -0700, Mike Machado wrote:
> I have a LVS-DR setup with two realservers. My service is a voip
> application, SIP specifically. I am trying to balance requests between
> the two. I have all the LVS stuff setup, and was able to get the telnet
> test to work properly. With UDP though, there seems to be a problem.
> When the application is forming its reply, it uses the realserver as the
> source IP, instead of the VIP, as it does with the telnet test. I assume
> this is because UDP is stateless. I tried to SNAT the packets back to
> the correct IP, but you cannot SNAT locally generated packets.
> I was able to change my voip application to just BIND to the VIP, but
> due to the nature of this application, it needs to be able to
> communicate on both the VIP and the RIP, I just want reply packets to
> use the same source IP and the inbound packets.
> Anyone come across this problem for UDP applications, along with a
> possible solution?

Fixing the application to send reply packets from the addressed
that they were recieved on is the best solution IMHO. It is
the way I have resolved this problem in the past. The alternative
would be to use LVS-NAT instead.

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