Date: Tue, 13 Feb 2007 13:18:59 -0500 From: Stephen Clark <Stephen.Clark@seclark.us> To: dart@es.net Cc: freebsd-net@freebsd.org Subject: Re: pmtud problem Message-ID: <45D20113.1060403@seclark.us> In-Reply-To: <45D1F216.1090708@es.net> References: <45D1E669.30402@seclark.us> <45D1F216.1090708@es.net>
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Eli Dart wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > > > >Stephen Clark wrote: > > > >>if the pc sends a packet of 1460 bytes with the DF bit set shouldn't the >>freebsd 4.9 system >>send back an icmp dest unreachable - fragmentation needed and DF bit set? >> >> > >Are you blocking icmp with a firewall filter? > > --eli > > > Good question - but the answer is no. The other interesting fact is when I drop the mtu on the gre to 1412 I do see the icmp messages. >>$ sysctl -a | grep mtu >>net.inet.tcp.path_mtu_discovery: 1 >> >>Now if I change the mtu of the gre to 1412 everything works. >> >>Any insight would be appreciated. >> >>Thanks, >>Steve >> >> > >- -- >Eli Dart Office: (510) 486-5629 >ESnet Network Engineering Group Fax: (510) 486-6712 >Lawrence Berkeley National Laboratory >PGP Key fingerprint = C970 F8D3 CFDD 8FFF 5486 343A 2D31 4478 5F82 B2B3 >-----BEGIN PGP SIGNATURE----- >Version: GnuPG v1.4.6 (FreeBSD) > >iD4DBQFF0fIWLTFEeF+CsrMRAig5AKDLp0PzYvaH93VZSfkiTMWorKCkBwCY6a78 >qWtMMH4GdqHFac6frQjb7w== >=06S0 >-----END PGP SIGNATURE----- >_______________________________________________ >freebsd-net@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-net >To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > > -- "They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin) "The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson)
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