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Bug 839999

Summary: tcpdump.el7 shows different output then tcpdump.el6 for ikev2four/ikev2fourv4 packets
Product: Red Hat Enterprise Linux 7 Reporter: Miroslav Vadkerti <mvadkert>
Component: tcpdumpAssignee: Jan Synacek <jsynacek>
Status: CLOSED NOTABUG QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: high Docs Contact:
Priority: high    
Version: 7.0CC: ksrot, msekleta
Target Milestone: beta   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-07-13 12:44:54 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
pcap dump used for testing
none
Patch for ike2 tests none

Description Miroslav Vadkerti 2012-07-13 12:29:54 UTC
Description of problem:
left is the RHEL7 tcpdump output
right is the RHEL6 tcpdump output

<     192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0649 -> 0x85b7!] isakmp 2.0 msgid 00000000 cookie 
                 1d9be9451d4f97a8->64a2a4b5d0e17b6a: parent_sa inf2[I]:
----
>     192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 6e7f!] isakmp 2.0 msgid 00000000 cookie 
                 1d9be9451d4f97a8->64a2a4b5d0e17b6a: parent_sa inf2[I]:

Version-Release number of selected component (if applicable):
tcpdump-4.2.1-3.el7

How reproducible:
100%

Steps to Reproduce:
1. run tcpdump on attached dump file
  
Actual results:
Differences

Expected results:
No differences

Additional info:

Comment 1 Miroslav Vadkerti 2012-07-13 12:30:16 UTC
Created attachment 598062 [details]
pcap dump used for testing

Comment 2 Michal Sekletar 2012-07-13 12:44:15 UTC
Created attachment 598064 [details]
Patch for ike2 tests

This is new behavior introduced by upstream, UDP checksums are handled more like TCP checksums. Please consider this behavior as correct and update test-suite accordingly.