MTI value to get the best throughput?

[#1]

My connection is good but is bobbing up and down between 1500 Kbps and 2000 Kbps synch speed.
What value should MTU be in this situation?

[#2]

MTU should always be whatever is specified by the ISP, it's not speed -related.
I think PN use 1400 on BT links.
Are you thinking of RWIN, that is best increased as sync speed rises?
(defaults will generally be OK at under 2meg)

[#3]

MTU has no affect whatsoever on sync speed!
(I have MTU on my router set to 1500)

[#4]

Mine is currently set at 1458, just wondered if reducing this might increase stability a little.

[#5]

If you mean stability of sync speed, then no it won't.
FWIW, after much tweaking I've settled on 1430, with an RWIN of 41700. IP Profile is 3500. YMMV of course.

[#6]

I'll have a tinker when I get some time

[#7]

I use 1430.

[#8]

dosent really matter that much as long as your not over 1500 as then packets have to be choped up