Slow DSL (Router) + MTU/RWIN settings...

doodah

doodah

doodah

Caporegime
Joined
18 Oct 2002
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Location
London
Just got back from uni and having a problem with my home wireless network. The speed of the WLAN connection is always changing (11Mbps > 54Mbps), whenever its on 11MBps the internet grinds to a halt when loading web pages. The router is only one floor below. Looked on ADSL guide and saw something about changing the MTU to improve speeds, seems simple enough but a couple of questions:

DRTcp doesnt have a box to change RWIN, is it important?

On ADSL guide it says to change comp MTU settings and not routers, i have seen elsewhere i should change the routers MTU settings and not the comptuers.

Here is the extract relating to my ISP and MTU settings.

In our forums a lot of Virgin ADSL users appear to be experiencing problems with slow or intermittent downloads. For at least some people it appears that tweaking the TCP/IP settings and mainly the Maximum Transmission Unit (MTU) will improve things.

The optimal values appear to be a MTU of 1430, and a RWIN value of 13900. To help people set these values we suggest you look at the two guides here and here.

1) For those with a router, it is best to change the MTU to 1430 on the computers, rather than on the router
 
It is pointless to change the MTU on the router but not on the computers and vice versa.

Changing the MTU isn't going to help your fluctuating wireless speeds though so I'd suggest you try to get that sorted before trying minor tweaks.
 
what i dont get is why its soooo slow when its connected at 11Mbps - not exactly a slow speed is it? I have moved the router closer and its worse :( , its staying on 11Mbps the whole time now.
 
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11Mbit wireless would give 5Mbit or so real throughput so unless you've got > 5Mbit broadband there shouldn't really be any problems.

I'd suspect that either your AP or wireless card are on the blink. Have you tried new drivers and firmware? Can you borrow different kit from a friend to try and track down where the fault is? Failing that, I'd considering buying replacements.
 
Found a sweet spot for the router. Will give MTU settings a try as d/l speeds even at full connection arent all that (Virgin net :rolleyes: )
 
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