FreeBSD router problems

Tue Jul 16 12:57:34 UTC 2013

--------------------------------------------
On Tue, 7/16/13, Eugene Grosbein <eugen at grosbein.net> wrote:

 Subject: Re: FreeBSD router problems
 To: "Barney Cordoba" <barney_cordoba at yahoo.com>
 Cc: freebsd-net at freebsd.org
 Date: Tuesday, July 16, 2013, 1:10 AM

 On 15.07.2013 22:04, Barney Cordoba
 wrote:

 > Also, IP fragmentation and TCP segments are not the
 same thing. TCP
 > segments regularly will come in out of order, NFS is
 too stupid to do
 > things correctly; IP fragmentation should not be done
 unless necessary
 > to accommodate a smaller mtu.

 The PR is about NFS over UDP, not TCP.

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Ok, so is there evidence that it's UDP and not an IP fragmenting problem?

Out of Order UDP is the same issue; its common for packets to traverse
different paths through the internet in the same connection, so OOO packets
are normal.

IP fragmentation is rare, except for NFS. A lot of ISPs will block fragmentation
because it's difficult to shape or filter fragments; they're often used to defeat
simple firewalls and filters.  

BC

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