This procedure is a false positive, and it would be best to stop the Checksum checking on both TCP and UDP. This procedure can repeated in the same manner for UDP checksums. To stop Wireshark from performing the checksum validation entirely, then open a packet with the checksum error, right click on the red TCP header, and select Protocol Preferences> and deselect the Validate the TCP Checksum entry: Remember – this will be saved in whatever profile you have open! You can easily return to this and re-enable the rule at any time. If you want to completely stop the checksum validation in Wireshark then continue with the next step. Wireshark is still checking the checksums and will still report these issues in the protocol detail view. You will see a line drawn through the rule: In the prior version 1.x interface, select that rule by clicking on the entry once. If you want to delete the rule in this profile, click the "-" box. This does not delete the rule, it simply is a way to turn on and off rules. ![]() Simply click the tick bow next to the rule: Keep in mind that these changes will be immediately written to whatever profile you have open! Step 3 If you click on either of the Foreground or Background boxes, you will get a color palette dialogue to change them. Select any of the rules, and in the new version of Wireshark, you will see the foreground and background colors (I have selected the Checksum Errors below): If you are using a Wireshark version 1.x then it is a little different:Ĭlick on the Edit Coloring rules icon. The Coloring Rules dialogue will show up: In the new Version 2.x of Wireshark, you access the coloring rules from the View menu: All the TCP and UDP packets will be colorized Red on Black and the Expert analysis function will report checksum errors. If the Wireshark host performs TCP and UDP checksum offloading – the process of calculating the checksum on the NIC and not by the protocol stack – Wireshark will trip on this. Our Udemy course on Wireless Packet capture Our custom profiles repository for Wireshark 0 of 5 - 0 votes Thank you for rating this article.Ĭheck out these great references as well:
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