Parts of the internet keep on disappearing on me

[Shachar Shemesh]

Hail the conquering hero!

Color me dumbfounded. Disabling TCP timestamps actually allows me to
connect to Google. Reenabling them re-introduces the problem.

The only question still remaining is "why"? I have up on the site two
captures. One of the working session, and one of the not working
session. To me, this still looks like a kernel bug.

Get them:
http://www.shemesh.biz/connection/working.dump
http://www.shemesh.biz/connection/notworking.dump

Ideas, anyone?

Thanks,
Shachar

On 01/20/2013 10:59 PM, shimi wrote:
>
>
> On Sun, Jan 20, 2013 at 9:49 PM, Shachar Shemesh <shachar at shemesh.biz
> <mailto:shachar at shemesh.biz>> wrote:
>
>     Hi all,
>
>     I have a really strange problem. On one of the computers in my
>     house, parts of the internet keep on disappearing. Sometimes half
>     the internet is inaccessible, and sometimes it's just a couple of
>     sites (google is a favorite for this problem).
>
>     This is, most definitely, NOT a router or ISP problem. Other
>     computers on the same network are working fine. A virtual machine
>     connecting via a bridge on the same network is working fine (via
>     NAT it does not).
>
>     Bringing the interface down and back up does not help.
>
>     Existing connections remain connected, without a problem.
>
>     The only thing that restores connectivity is rebooting (!!)
>
>     There is nothing out of the ordinary in the routing table.
>
>     Ideas?
>
>
>
> Does ping work when the internet is 'down'? If so, I would go for:
>
> TCP Timestamps, TCP SYN Cookies, Selective ACKs, Window Scaling
>
> try eliminating all of them ;)
>
> -- Shimi
>
>
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> Linux-il at cs.huji.ac.il
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-- 
Shachar Shemesh

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