How to set your MTU value
ping bbc.co.uk -f -l 1464
Pinging bbc.co.uk [212.58.241.131] with 1464 bytes of data:
Reply from 212.58.241.131: bytes=1468 time=22ms TTL=243
Reply from 212.58.241.131: bytes=1468 time=26ms TTL=243
Reply from 212.58.241.131: bytes=1468 time=32ms TTL=243
Reply from 212.58.241.131: bytes=1468 time=20ms TTL=243
change by increaments of 10 until fragments
ping bbc.co.uk -f -l 1474
Pinging bbc.co.uk [212.58.241.131] with 1474 bytes of data:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
once fragments go back to the previous and then increament by 2 until fragments again
so back to 1464 and test
fragments and no-response around 1470 1472
then take that value and add 28 to give you your MTU
this was done or virgin media fibre and it uses the max MTU 1500
Hope this helps
Cheers
Rescue PC
more work to be done