netdev - Re: Default TCP Options creating problems

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Date:	Fri, 27 Jan 2012 15:49:34 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nanda Kumar <heramba85@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: Default TCP Options creating problems

Le vendredi 27 janvier 2012 à 19:45 +0530, Nanda Kumar a écrit :
> Hi,
> 
> I am using Ubuntu 11.10 and unable to connect to my ISP login server.
> The same is working under windows. Under linux, ISP server does not
> respond TCP SYN packet even. I did a comparison of packet capture of
> windows and linux and found, linux include TCP options by default.
> After manually disabling TCP Timestamp via sysctl, the login is
> happening fine.
> 

> 
> Is there any reason why TCP option is enabled by default? The same
> problem was happening under OpenSUSE 12.1 x86_64 also. My friend
> informed me that his android mobile is also unable to connect to ISP
> login server.

I am very sorry, but you should complain to your ISP, 20 years after RFC
1323, it should support it.

TCP options are ... options, and as such should not be denied by a
conformant TCP stack.



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