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Re: [lvs-users] LVS-DR and Windows 7 Clients (Linux Real Servers)

To: Chris Chen <chchen@xxxxxxx>
Subject: Re: [lvs-users] LVS-DR and Windows 7 Clients (Linux Real Servers)
Cc: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Mon, 7 Jun 2010 16:33:34 +0900
On Fri, Jun 04, 2010 at 07:01:41PM -0700, Chris Chen wrote:
> Here's a trace of a recent SSL handshake attempt:
> 
>    1   0.000000 CLIENT_IP -> SERVER_IP TCP 49168 > urd [SYN] Seq=0  
> Win=8192 Len=0 MSS=1380 WS=2 8192 52
>    2   0.000010 SERVER_IP -> CLIENT_IP TCP urd > 49168 [SYN, ACK]  
> Seq=0 Ack=1 Win=5840 Len=0 MSS=1460 WS=2 5840 52
>    3   0.000680 CLIENT_IP -> SERVER_IP TCP 49168 > urd [ACK] Seq=1  
> Ack=1 Win=66240 Len=0 66240 40
>    4   0.000990 CLIENT_IP -> SERVER_IP SSL Client Hello 66240 209
>    5   0.001005 SERVER_IP -> CLIENT_IP TCP urd > 49168 [ACK] Seq=1  
> Ack=170 Win=6912 Len=0 6912 40
>    6   0.009298 SERVER_IP -> CLIENT_IP TLSv1 Server Hello,  6912 1420
>    7   0.009313 SERVER_IP -> CLIENT_IP TLSv1 Certificate, Server Key  
> Exchange, Server Hello Done 6912 1356
>    8   0.010187 CLIENT_IP -> SERVER_IP TCP 49168 > urd [ACK] Seq=170  
> Ack=2697 Win=66240 Len=0 66240 40
>    9   0.024244 CLIENT_IP -> SERVER_IP TLSv1 Client Key Exchange,  
> Change Cipher Spec, Encrypted Handshake Message 66240 174
>   10   0.025339 SERVER_IP -> CLIENT_IP TLSv1 Change Cipher Spec,  
> Encrypted Handshake Message 7984 99
>   11   0.225653 SERVER_IP -> CLIENT_IP TLSv1 [TCP Retransmission]  
> Change Cipher Spec, Encrypted Handshake Message 7984 99
>   12   0.226324 CLIENT_IP -> SERVER_IP TCP 49168 > urd [ACK] Seq=304  
> Ack=2756 Win=66180 Len=0 SLE=1597629342 SRE=1597629401 66180 52

[snip]

>   23  25.548536 SERVER_IP -> CLIENT_IP TLSv1 [TCP Retransmission]  
> Change Cipher Spec, Encrypted Handshake Message 7984 99
>   24  25.549373 CLIENT_IP -> SERVER_IP TCP [TCP Dup ACK 12#6] 49168 >  
> urd [ACK] Seq=304 Ack=2756 Win=66180 Len=0 SLE=1597629342  
> SRE=1597629401 66180 52
>   25  29.280023 CLIENT_IP -> SERVER_IP TLSv1 Encrypted Alert 66180 77
>   26  29.280040 SERVER_IP -> CLIENT_IP TLSv1 Application Data 7984 157
>   27  29.280109 CLIENT_IP -> SERVER_IP TCP 49168 > urd [FIN, ACK]  
> Seq=341 Ack=2756 Win=66180 Len=0 66180 40
>   28  29.280147 SERVER_IP -> CLIENT_IP TCP urd > 49168 [FIN, ACK]  
> Seq=2873 Ack=342 Win=7984 Len=0 7984 40
>   29  29.280582 CLIENT_IP -> SERVER_IP TCP 49168 > urd [RST, ACK]  
> Seq=342 Ack=2873 Win=0 Len=0 0 40
> 
> They seem to get into a retransmit loop right after the client sends  
> the Change Cipher Spec message.
>
> If I'm running OpenSSL on the windows box and using s_client with  
> -connect, I can make it punch through by hitting a carriage return.

Hi Chris,

As the client seems to TCP ACK the server's Change Cipher Spec message,
I am guessing that it's application is ignoring it for some reason.
Does the problem occur if you take LVS out of the equation and simply
connect directly to one of the Real Servers from the Windows 7 machine?

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