MTU advice

I'm currently using 1500 on both machines and the router. The figure of 1458 has been mentioned wrt to IDNet, I'd appreciate any experience people have on the best choice.

Thanks.

I use 1500 with Path MTU Discovery set to "On", and let it sort itself out- works fine for me

Unless you're lucky enough to have rock stable download speeds, I don't think it's worth trying to tune MTU/RWIN much- the variations you get are swamped by the speed changes due to traffic variation (aka contention- BT, not IDNet as far as I can tell).

I've had speed tests range from about 6700Kbps down to an occasional one less than 900Kbps, so I don't try to tune

Thanks, Bill. Living in Milton Keynes, at the end of a long length of aluminium, I have an IP profile of 2500kbps, so I can only drool at your speeds. However, I do get fairly consistent speed tests at 2400kbps down - one advantage of not being able to go much faster I guess.

I must admit I'm quite happy with my speeds, even though they vary all over the place (BT claim my exchange isn't contended.... yeah, right )

According to Samknows, I'm only just over a kilometre from the exchange- 8128 down, 448 up and a profile of 7150

You know how to make a boy feel jealous, Bill...

I've had consistent high speeds of approx. 4 to 6.5 Mbps for months - then my exchange went Red a month ago (using this checker: Zen Support - Exchange Checker) -- and surprisingly I still got good speeds for 2-3 weeks, now it's plummeted:
Downstream 878.8 Kbps ( = 0.9 Mbps )
Upstream 366.4 Kbps ( = 0.4 Mbps )

Things can certainly change fast ...

S

I know, look at Nildram.

Update:
I went out after I posted above speed test, returned 45 mins later to find connection dropped (very rare here), re-booted router [with 30 minutes unplugged], speed now:
Downstream 5,251.7 Kbps ( = 5.1 Mbps )
Upstream 373.1 Kbps ( = 0.4 Mbps)

stale sessions? with an ongoing Red exchange status, I don't jump to any conclusions.

S

Toes crossed for you.

I was just wondering if it's really worth me tweaking the MTU and RWIN? I searched back to a few other threads based on this and different people tried different values... the problem is I've tried to set my MTU to 1500, but it keeps getting detected as 1458 by dslreports.com.

I tried using 2 tools (TCPOptimizer and DrTCP) however I had to manually change the registry because these 2 don't seem to be writing to the registry under the latest build of Windows Vista (the registry protection blocks it) so I did that and it still hasn't really done anything.

I'm always trying to get that last ounce of speed if I can change a few things, but I don't know if it matters as much as it used to (as on 2Mb).

Any ideas/suggestions please?
Thanks