Making 3 Mobile Broadband work with googlemail (and other sites)

February 15, 2011 at 12:32 am Leave a comment

It appears that people in the london area have been having issues with timeouts using 3 Mobile broadband for the last month or so

http://www.3g.co.uk/3GForum/showthread.php?t=99773

Someone on this forum found a work around – but forums lack readability and everything good be rather clearer.

Symptoms: Connection seems to mostly work but some https sites simply timeout (in particular wordpress and google mail)

Causes: This has something to do with MTU discovery.

Solution: Lower your mtu

On windows this can be done by:

* Opening a command as an administrator (Type cmd into the start bar, then select the shell and press ctrl-shift-enter)
* Typing “netsh interface ipv4 show subinterfaces” to list all connections, and identify the three connection.
* Typing “netsh interface ipv4 set subinterface “3Connect (or similar)” mtu=700″

See http://www.richard-slater.co.uk/archives/2009/10/23/change-your-mtu-under-vista-or-windows-7/ for more details.

I’m going to send three an e-mail. I wonder how long it will take them to fix this.

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