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Thread: Problem with MTU
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06-13-2006, 07:38 AM #1Web Hosting Evangelist
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- Jun 2004
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Problem with MTU
Hi there, i know this isn’t really something web hosts deal with but it is do with tcp/ip specs and networking so I’m going to ask anyway!
I picked up an xbox360 the other week, its sat in my living room next to my media center pc. The media center PC has a d-link dwl-520+ wireless network card which in turn is hooked up to a standard 54mbps Belkin router.
Rather than pay over the odds for a MS wireless adaptor i decided i would just use ICS on the media center pc (especially since i intend to stream audio through it)
While configuring the connection the Xbox failed on the MTU test, after reading several KB articles I discovered the MTU needs to be no lower than around 1370 - that’s fine I thought ... XP defaults to 1480
So i hopped on the media center pc and at CMD prompt rang a: ping google.com -f -l 1400 (ping google with 1400byte file and don’t fragment packet)
I got back:Packet needs to be fragmented but DF set.
i tried the old higher-lower method and found it is set to 1281
I tried to change the MTU with drtcp but it didn’t change.
I checked the MTU on my router - 1480 (default)
I checked the MTU between my XP media center and my Xbox 360 - fine (above 1400 didn’t bother to check exactly where)
Essentially the MTU on my wireless card is set to 1281 and i need it set higher.
I thought perhaps it would be fixed by a re-install so i re-formatted the machine installed only the latest drivers from the d-link site, no software, no other drivers (other than those detected by windows)
repeated the ping google.com -f -l 1400 and ....Packet needs to be fragmented but DF set.
If anyone has any ideas it would be appreciated, cheers!
P.S if you need clarification just post ... it’s not the easiest thing to explain on a forum!
Cheers.
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06-13-2006, 11:11 AM #2Web Hosting Master
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<erno> hm. I've lost a machine.. literally _lost_. it responds to ping, it works completely, I just can't figure out where in my apartment it is.
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06-13-2006, 11:33 AM #3Web Hosting Evangelist
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I tried to change the MTU with drtcp but it didn’t change.
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06-14-2006, 10:58 PM #4An Awesome Dude
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- Oct 2002
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You have to reboot after you change the MTU setting (That part of the registry is only looked @ at bootup (@ least on 98se))
Good luck!
Tinyurl is the answer for posting long urls!!!
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06-15-2006, 05:53 AM #5Web Hosting Evangelist
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- Jun 2004
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Ive tried that, actually on 2k/XP based machines it only required a restart of networking, but even so i rebooted the whole machine.
Im wondering if it is my network drivers :/
time to buy a new network card i think!