MTU Size

feriso · 29 Jun 2006 at 15:47

Whats the best MTU/RWAIN (?) settings to use, I read somewhere that altering these can improves speed/stability of the line.

On F2S and using a Belkin 7630 wireless

just_grass · 29 Jun 2006 at 16:08

feriso said:
Whats the best MTU/RWAIN (?) settings to use, I read somewhere that altering these can improves speed/stability of the line.

On F2S and using a Belkin 7630 wireless

I think the standard MTU in BT's ipstream is 1500.... some find varying settings all the way down to about 1432 better, you really need to just try it out.

http://www.dslreports.com/tweaks/MTU - All about MTU settings.

&

http://www.dslreports.com/faq/5793 - How-to for setting it correctly.

Will no doubt help you out. - Dont forget to set it both on your router, AND on your computers for best efficiency. it wont have any effect just changing it on your computer. (I dont think modems can have the MTU set on them, so computer is all you need to change).

Hope this helps,
Alex

feriso · 30 Jun 2006 at 13:40

I'll give this a whirl when I get home then, ta....

Curiosityx · 30 Jun 2006 at 14:16

Nearly all consumer broadband products specify an MTU of 1500, but there are some companies that specify different for there networks.

F2s in believe lease there services of Easynet, whom i believe use an MTU of 1500 also.

BT Wholesale for example suggest that an MTU of 1458 is is the optimal setting for devices on there DSL network

http://www.adslguide.org.uk/guide/mtu.asp

Curiosityx · 30 Jun 2006 at 14:21

Ignore

tolien · 30 Jun 2006 at 14:41

Curiosityx said:
BT Wholesale for example suggest that an MTU of 1458 is is the optimal setting for devices on there DSL network

http://www.adslguide.org.uk/guide/mtu.asp

1500's the recommended setting for BTw as well (unless you're using PPPoE) - there used to be a problem with using 1500 (which is probably what that page is referring to), but it's long since been fixed.

You might see a (tiny) improvement tweaking your MTU and RWIN, but it's hardly worthwhile. The defaults have been fine for me anyway - some users at the upper end of the ADSL2+ setups might get an advantage though.

It certainly isn't going to improve the "speed/stability of the line", especially not the stability.

Gavin · 30 Jun 2006 at 15:59

Mines set at 1432 due to using vpn at 1500 it is to flaky

tang0 · 30 Jun 2006 at 18:01

Nildram is 1478

tolien · 30 Jun 2006 at 18:06

Gavin said:
Mines set at 1432 due to using vpn at 1500 it is to flaky

VPN's different because you've got an extra packet overhead.

Nildram is 1478

Nope.

tang0 · 30 Jun 2006 at 19:17

so why is it when is set my router and pc to 1500 it says 1478 in testers ?

tolien · 30 Jun 2006 at 19:38

Is the tester on the Nildram network?

tang0 · 1 Jul 2006 at 20:09

Everyone on ADSL guide forums are saying that nildram capped their mtu to 1478, which would explain it

tolien · 1 Jul 2006 at 20:18

Where "everyone" = 2 posts in the last month.
Older posts suggests Nildram's playing around, though if you've got path MTU discovery enabled, it still doesn't matter

slipd · 1 Jul 2006 at 21:31

tang0 said:
Nildram is 1478

I'm with Nilly and my router's MTU is set to 1458 from my old Pipex days?

Do I need to change it?

SW.

tolien · 1 Jul 2006 at 22:04

Try it and see.

Gavin · 2 Jul 2006 at 22:43

tolien said:
VPN's different because you've got an extra packet overhead.

Hence why is said "due" to, of course i havnt got a clue further that clever clogs

Damn you annoy me some times as i know you are the jedi at this stuff

cyclopopcicle · 2 Jul 2006 at 22:55

whats the actual differance will it make changing the MTU?

tolien · 2 Jul 2006 at 22:58

If you try sending packets larger than the MTU, they get fragmented, which takes up CPU time.

Locky · 3 Jul 2006 at 00:08

best for me is 1430