Procedure 32 Capturing A Packet Dump; Procedure 33 Disabling Wireshark Packet Checksum Verification; Nortel Mobile Communication 3100 Series Portfolio; Nn42030-600 01.04 Standard - Nortel MCG3100 Administration Manual

When you view the packet captures from the MCG 3100 packet capture utility,
all of the checksums in the trace are incorrect. This occurs because the network
interface on the MCG 3100 performs checksum offloading. This means that the
network interface (rather than the OS TCP/IP stack) adds the checksum to the
packets. During the capture process, the host OS sends the packets (being
captured) directly to the capture interface without the addition of a checksum.
Wireshark performs checksum verification; packet checksum errors can prevent
TCP reassembly. You can disable Wireshark checksum verification. For more
information, see
(page
Procedure 32
Capturing a packet dump
Step
1
2
3
4
5
6
Procedure 33 "Disabling Wireshark packet checksum verification" (page
75)
more information, see the Wireshark documentation for your version of
Wireshark or visit www.wireshark.org.
Procedure 33
Disabling Wireshark packet checksum verification
Step
1
2
Copyright © 2007, Nortel Networks
.
Procedure 33 "Disabling Wireshark packet checksum verification"
75).
Action
Log on to the MCG 3100 Web Console as an administrative user.
Select the Tools tab.
On the Tools page, under Packet Dump, select an interface.
MCG 3100 traffic is typically carried on the eth0 interface.
Click Capture to start capturing data.
Click Stop to stop capturing data.
Click Save and then navigate to the folder in which you want to save
the packet dump.
provides the steps for Wireshark Version 0.99.6a (SVN Rev 22276). For
Action
From the Wireshark Edit menu, select Preferences.
In the left pane of the Preferences dialog box, expand Protocols.

Nortel Mobile Communication 3100 Series Portfolio

Nortel Mobile Communication Gateway 3100 — Administration

NN42030-600 01.04 Standard

Release 2.0 14 November 2007
ATTENTION
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Packet dump utility 75