Quote:
Originally Posted by gary
Hi Mike,
One other thing to check that comes to mind that can also
exhibit this symptom is the MTU size set in your ADSL router.
Your ISP will be able to provide a recommended value but sometimes
if it is set too large, things can go amiss with packet fragmentation
handling which one can only spot by running an Ethernet packet
sniffer.
For example, if your MTU is set to 1500, you might try a lower value such
as 1492.
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Gary, 1492 is indeed the magic number in ADSL, leaving room for LLC/SNAP headers. Cable and wireless might be different, but similar rules probably apply to their headers.
You will not see fragmentation with a sniffer unless your IP stack sets the "don't frag" bit. The router will silently do the fragging itself.
Unfortunately Windows makes this hard to set by being a registry entry. See
Article ID: 900926 but rather than 576 they are discussing use 1492.
If it seems to make no difference you can keep reducing the MTU insteps of 4 and rebooting after each trial, but the next magic number is probably 1456.
Andrew