Problems with IPVS

Joseph Mack NA3T jmack at wm7d.net
Tue Oct 17 13:48:28 BST 2006


On Tue, 17 Oct 2006, Mindaugas wrote:

>
>>  Web clients are Sony Ericsson phones so I cannot upgrade all of them. :)

Do you know if this is a problem with the phone or ipvs 
(does it work with a regular client)?

>
> I investigated a bit further and that's what I found:
>
> 1. phone sends SYN packet to proxy;
> 2. proxy responds with SYN,ACK;
> 3. phone sends ACK;
> 4. phone sends HTTP GET request;
> 5. proxy ACKs packet 4;
> 6. proxy sends HTTP data packet;
> 7. proxy sends another HTTP data packet;
> 8. proxy sends FIN packet;
>
> weird things starts here
>
> 9. phone once more sends ACK packet acknowledging packet 2 (duplicate of 
> packet 3);
> 10. and one more dupe of packet 3;
> 11.-14. proxy repeats packet 6. 4 times.
>
> The problem is that LVS does not pass packets 11. to 14. to phone. Why?

this is out of my league sorry

Joe

> In case of DNAT packets 11.-14. are passed to phone which at the end 
> acknowledges packets 6. and 7. and then acknowledges packet 8. thus closing 
> TCP connection.
>
> Mindaugas
>
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-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!


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