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RE: who makes the firewall that puts asterisks in the initial greeting?

2001-08-10 17:29:49

PMTU probing?

why should PMTU probing take several minutes?  especially between a 
firewall and the SMTP server inside the firewall, on an already-
established connection?

Unless the firewall is busy handling Code Red analysis -- which is
pretty likely right now, by the way -- this was the only thing that
comes to mind as something I have seen take awhile.  If ICMP 'must
fragment' messages are being dropped, the TCP stack has to decide
its dealing with a broken network and start experimenting with 
smaller packets.