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[Oldjim]

Thanks Chrysalis
Will change to the numbers suggested although before I do this page seems to suggest a value of 580,000 which is a lot higher https://community.plus.net/t5/Library/Guide-To-RWIN-amp-MTU/ba-p/1322233 also - and this contradicts both of these values - isn't the limit you can put in the field 65,535 as it is a 2 byte field or does the program do something with windows scaling - a value of 4 perhaps

[Chrysalis]

windows scaling increases the byte limit.

you can try the higher value its up to you, I just suggested that as a starting point.

[Weaver]

Oldjim - correct this is a two byte wide field, but window scaling means that it is to be reinterpreted as something shifted left n places, so this is how you get the big values. The wider (shifted) result value that you can enter clearly has to be a multiple of 2ⁿ bytes and it has been suggested that you make the thing a multiple of MSS as discussed earlier, a slight tweak, not critical, if my understanding is correct (very rusty). I have heard of window scale shift values that are quite high, they are not always the smallest values that will reach a particular result. ( eg << 8 even though the result is nowhere big enough to need it.)