* Malcolm Beattie (mbeattie@???) [990420 08:53]:
> hangs". What's happening is that the client sends larger and larger
> packets with the "Don't Fragment" bit set so that, when the maximum
> MTU is reached, it'll get back an "ICMP Frag Needed" packet and thus
> know the optimum MTU. If some idiot has configured a firewall or
> router wrongly and drops all ICMP on the floor then the "ICMP Frag
> Needed" never arrives and the client thinks the packet has just
> been a random drop and keeps resending.
Using a combination of tcpdump/tcpshow, it should be pretty simple to verify
if this is the case. Having a copy of "TCP/IP Illustrated Volume 1" would
also be a great help.
--
j.
James FitzGibbon (JF647) james@???
EHLO Solutions Voice/Fax +1 416 410-0100
--
*** Exim information can be found at
http://www.exim.org/ ***
