IP fragmentation problem Post: 302771032

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Special Forums IP Networking IP fragmentation problem Post 302771032 by arichard on Tuesday 19th of February 2013 11:06:49 AM

02-19-2013

Registered User

IP fragmentation problem

Hello all, I am experiencing a problem with IP fragmentation.
I am receiving an udp packet that is larger than the MTU and it is fragmented along the network.
I am receiving the two fragments but they are not being reassembled correclty.

The MTU of the system is 1500 and I cannot increase it, because I am getting this error: SIOCSIFMTU: Numerical result out of range.
Is it necessary to build the kernel with support for jumbo frames?

There's any option that should be enabled on the kernel (2.6.34.8) to support this feature? Shouldn't this be a default feature?

Any hint that may assist in debugging this issue is welcome.

The first packet it is considered (bad) as a complete packet and I am getting an error at the app level.
https://picasaweb.google.com/1053854...94371327482338

The second packet is the last part of the fragment which should be ignored completely:
https://picasaweb.google.com/1053854...94366260648562

As reference I am sending the same packet to my laptop which is implementing correctly the fragmentation re-assembly:
https://picasaweb.google.com/1053854...94364006259698

arichard

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LEARN ABOUT CENTOS

trace-cmd-check-events

TRACE-CMD-CHECK_EV(1)													     TRACE-CMD-CHECK_EV(1)

NAME

       trace-cmd-check-events - parse the event formats on local system

SYNOPSIS

       trace-cmd check-events [OPTIONS]

DESCRIPTION

       The trace-cmd(1) check-events parses format strings for all the events on the local system. It returns whether all the format strings can
       be parsed correctly. It will load plugins unless specified otherwise.

       This is useful to check for any trace event format strings which may contain some internal kernel function references which cannot be
       decoded outside of the kernel. This may mean that either the unparsed format strings of the trace events need to be changed or that a
       plugin needs to be created to parse them.

OPTIONS

       -N - Don't load plugins

SEE ALSO

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1),
       trace-cmd-list(1), trace-cmd-listen(1), trace-cmd-start(1)

AUTHOR

       Written by Vaibhav Nagarnaik, <vnagarnaik@google.com[1]>

RESOURCES

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

COPYING

       Copyright (C) 2011 Google, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

	1. vnagarnaik@google.com
	   mailto:vnagarnaik@google.com

								    06/11/2014						     TRACE-CMD-CHECK_EV(1)