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VS/TUN, VS/DR response problem

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: VS/TUN, VS/DR response problem
From: Paresh <paresh@xxxxxxxxxxxxx>
Date: Sat, 07 Jan 2006 15:12:26 +0530
Hi,

I wanted to know that in VS/TUN and VS/DR when reply goes back directly from real server to client then what is source IP and port used?

If it uses VIP as source IP, then from where real server get state of connection that is present between client and VIP host? State may include VIP, corr. port on VIP host, various sequence numbers, time values like RTT, etc. which are required to send response back client on already existing connection (between client and VIP host).

I guess real server can not respond back to client using its own IP, that wont be acceptable by normal TCP symantics.

I searched archives for this but could not find answer there.

Please CC reply to my email address: paresh@xxxxxxxxxxxxx
- Paresh

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