[lvs-users] No Application data in LVS

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: [lvs-users] No Application data in LVS
From: Michael Schwartzkopff <misch@xxxxxxxxxxx>
Date: Mon, 26 Nov 2007 10:27:33 +0100

I am quite new to LVS and I wanted to understand it from the basics. So I set 
up a LVS director according to the mini howto, NAT manual example

for tests I only used one real server.
ipvsadm look like:
xen01:~# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  xen01:telnet rr
  ->        Masq    1      1          0

When I telnet from a client to the virtual server address I see:

Connected to
Escape character is '^]'.


But no login line. The same with HTTP protocol. No Application data are 
displayed in the client.

If I reconfigure my director as a plain router eveything works smooth. I can 
log into the real server with telnet, at least I see a login line.

When i tcpdump on the real server and the client I do see no difference in 
number and contents of the packets on both machines.
When the connection hangs I see a lot of
Server:23 -> Client:3796 P 1:13(12) ack 25 win 362  <nop,nop,timestamp 
21277911 3009388219>
but no packet back from the client.

It seems that something very strange happens. Perhaps anybody gor an idea? 
Where should I search further?

I use debian etch. Director and real server and virtual xen virtual machines. 
Client is a real machine.

ipvsadm version 1.24+1.21-1.4

Dr. Michael Schwartzkopff
MultiNET Services GmbH
Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany
Tel: +49 - 89 - 45 69 11 0
Fax: +49 - 89 - 45 69 11 21
mob: +49 - 174 - 343 28 75

mail: misch@xxxxxxxxxxx

Sitz der Gesellschaft: 85630 Grasbrunn
Registergericht: Amtsgericht München HRB 114375
Geschäftsführer: Günter Jurgeneit, Hubert Martens


PGP Fingerprint: F919 3919 FF12 ED5A 2801 DEA6 AA77 57A4 EDD8 979B
Skype: misch42

<Prev in Thread] Current Thread [Next in Thread>