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Help configuring Windows Server 2008 MTU size to work with Linksys router

Posted on 2008-06-11
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Last Modified: 2008-06-26
At work we have a Windows Server 2008 server and I am having problems accessing its websites from home.  At home I am behind a Linksys Wireless Router that apparently has a max MTU size.  I think the problem is that the packets that the server sends to the router are too large and they are getting dropped because the browser just kind of stops while saying "Waiting for www.whatever.com" and eventually times out.  If I take out the router and connect directly to my cable modem, I can access the websites.  My question is how to configure the server so that it send proper size packets because I imagine that many people have a linksys router and cannot access our site.
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Question by:MarkAOlsen
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6 Comments
 
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Expert Comment

by:Michael Worsham
ID: 21759743
Which Linksys router do you have at the server-side site?

Most Linksys-side MTU settings for handing websites is 1492, however this depends solely on your Internet connection (i.e. cable, DSL, etc), not on your server-side handling rate.
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by:MarkAOlsen
ID: 21759961
Actually, the server is behind a NETGEAR ProSafe VPN Firewall FVS388.  Could that be causing the problem?
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LVL 29

Expert Comment

by:Michael Worsham
ID: 21760022
Do you have TCP port 80 opened to the outside world so that it can be seen?

A quick way to test is to try 'telnet www.sitename.com 80' and see if it connects.
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Author Comment

by:MarkAOlsen
ID: 21760053
Yes, 80 is open and I can access the web site from most places.  I think the netgear is the problem in that it may be sending packets that are too large.  I'm going to do some experimenting when I get home (at work now) and see if lowering the MTU on the netgear will solve the problem.  If it does I will close the question.
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Michael Worsham earned 500 total points
ID: 21760133
Another thing you can do on the Windows Server 2008 side is this:

In the console enter the following commands to change the MTU:
netsh interface ipv4 show interfaces

Take note of the id number of the wireless interface (as you will need it below), then do:
netsh interface ipv4 set subinterface id mtu=1492 store=persistent
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Author Comment

by:MarkAOlsen
ID: 21875282
Interesting solution to this one.  I had the HyperV RC role installed on the server and removed it the same time that I lowered the MTU on the interface.  It appeared that the MTU solution was what made me able to see my websites from anywhere but now I believe it was the uninstallation of the HyperV server role because I reinstalled it and the problem started happening again and it was fixed when I uninstalled it again.  So basically, I don't think the MTU solution worked and if anyone else comes upon this problem and they have HyperV installed, uninstall it and see if it helps you out.

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