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Re: slow response of the realserver

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: slow response of the realserver
From: Joseph Mack <mack.joseph@xxxxxxx>
Date: Tue, 07 Oct 2003 16:11:20 -0400
Michael Lee wrote:
> 
> Some more info about my problem. I run tcpdump at my problem node (lvs2), and 
> I
> see some strange entries, such as:
> 
> 192.168.1.11 > 192.168.1.12: icmp: net 192.168.0.1 unreachable. [tos 0xc0]
> 
> arp who-has 192.168.1.11 tell 192.168.1.12
> 
> 192.168.1.11 > 192.168.1.13: icmp: 192.168.1.11 udp port 1900 unreachable [tos
> 0xc0]
> 
> 192.168.0.1 is not in my network. lvs1 is 192.168.1.11, lvs2 is 192.168.1.12,
> lvs3 is 192,168.1.13, VIP is 192.168.2.110.
> 
> also, there are:
> 
> PPPoE [ses 0x405] 218.103.30.69 > 218.102.193.243 icmp: echo request.

it's a bit of a puzzle. You're probably the only person who can find
out what these packets are about, but they may not be part of your
problem (you should find out why you're sending packets to 192.168.0.1). 
What you're looking for is packets "associated" with the telnet
SYN packet that happen between the SYN and the connection. These might
be 

arp packets
packets to the client (possibly director)

that have IPs or ports associated with your telnet connection.

Joe


-- 
Joseph Mack PhD, High Performance Computing & Scientific Visualization
SAIC, Supporting the EPA Research Triangle Park, NC 919-541-0007
Federal Contact - John B. Smith 919-541-1087 - smith.johnb@xxxxxxx
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