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    SubjectRe: PMTU, MSS and "fragmentation needed" problem with linux?
    from my shorewall.conf.
    -----------------
    #
    # MSS CLAMPING
    #
    # Set this variable to "Yes" or "yes" if you want the TCP "Clamp MSS to
    PMTU"
    # option. This option is most commonly required when your internet
    # interface is some variant of PPP (PPTP or PPPoE). Your kernel must
    # have CONFIG_IP_NF_TARGET_TCPMSS set.
    #
    # [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.
    #
    CLAMPMSS=1412
    --------------------

    see also:
    http://en.tldp.org/HOWTO/IP-Masquerade-HOWTO/mtu-issues.html
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