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SubjectRe: PMTU, MSS and "fragmentation needed" problem with linux?
from my shorewall.conf.
# Set this variable to "Yes" or "yes" if you want the TCP "Clamp MSS to
# option. This option is most commonly required when your internet
# interface is some variant of PPP (PPTP or PPPoE). Your kernel must
# [From the kernel help:
# This option adds a `TCPMSS' target, which allows you to alter the
# MSS value of TCP SYN packets, to control the maximum size for that
# connection (usually limiting it to your outgoing interface's MTU
# minus 40).
# This is used to overcome criminally braindead ISPs or servers which
# block ICMP Fragmentation Needed packets. The symptoms of this
# problem are that everything works fine from your Linux
# firewall/router, but machines behind it can never exchange large
# packets:
# 1) Web browsers connect, then hang with no data received.
# 2) Small mail works fine, but large emails hang.
# 3) ssh works fine, but scp hangs after initial handshaking.
# ]
# If left blank, or set to "No" or "no", the option is not enabled.

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