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Optimal MTU for wifi?

VileReynard
Seasoned Pro
Posts: 10,976
Thanks: 265
Fixes: 11
Registered: 01-09-2007

Optimal MTU for wifi?

Should the MTU size of a PC on a wifi network be identical to that of the WAN side of a network?
Typically the WAN side is set to 1500 bytes.
My Linux system defaults:-
Loopback MTU= 16436
Ethernet MTU = 1500
Wifi = 1500
On a WEP "security" wifi network is this optimal?
Regards,

3 REPLIES
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Re: Optimal MTU for wifi?

Having them all the same (ignore the linux loopback, its an internal pipe) is the best policy.
Whether 1500 is actually the best for your connection you can only find out by experimenting with some other values.
Community Veteran
Posts: 26,718
Thanks: 929
Fixes: 10
Registered: 10-04-2007

Re: Optimal MTU for wifi?

The big no, no is having the PC MTU larger than the WAN as this can cause fragmentation if the MTU path discovery doesn't work - that can apply to wired and wireless although the effect is less noticeable on wired.
jelv (a.k.a Spoon Whittler)
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Will
Grafter
Posts: 44
Registered: 19-08-2007

Re: Optimal MTU for wifi?

As jelv says, always ensure your router MTU is the same or greater than windows.
There are a number of ways you can tweak this. I find 1430 works best for me. But it's different for each user.
www.kitz.co.uk is a great took to help you tweak it.