Maximum I can ping BBC is with a packet size of 1464, above that it fails.
I can however ping my isp with 1492.
Just out of interest would setting the MTU at 1500 cause packets to certain websites to fragment and cause inefficiency?
See my pings below...
C:\Users\Paul >ping bbc.co.uk -l 1464
Pinging bbc.co.uk [212.58.246.104] with 1464 bytes of data
Reply from 212.58.246.104: bytes=1464 time=30ms TTL=54
Reply from 212.58.246.104: bytes=1464 time=31ms TTL=54
Reply from 212.58.246.104: bytes=1464 time=32ms TTL=54
Reply from 212.58.246.104: bytes=1464 time=31ms TTL=54
Ping statistics for 212.58.246.104:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 30ms, Maximum = 32ms, Average = 31ms
C:\Users\Paul >ping bbc.co.uk -l 1465
Pinging bbc.co.uk [212.58.246.104] with 1465 bytes of data
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 212.58.246.104:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\Users\Paul >ping zen.co.uk -l 1492
Pinging zen.co.uk [212.23.0.100] with 1492 bytes of data:
Reply from 212.23.0.100: bytes=1492 time=28ms TTL=120
Reply from 212.23.0.100: bytes=1492 time=26ms TTL=120
Reply from 212.23.0.100: bytes=1492 time=26ms TTL=120
Reply from 212.23.0.100: bytes=1492 time=26ms TTL=120
Ping statistics for 212.23.0.100:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 26ms, Maximum = 28ms, Average = 26ms
Freeserve Dial-Up --> BTopenworld --> <n>ildram -->Talk Talk LLU --> ZeN
ASUS RT-AC66U