Bug 179400

Summary: can't sniff incoming traffic on interface that is part of a bond
Product: Red Hat Enterprise Linux 4 Reporter: Damian Menscher <menscher>
Component: kernelAssignee: John W. Linville <linville>
Status: CLOSED CANTFIX QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: jbaron
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2006-03-01 15:18:47 UTC Type: ---
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Description Flags
jwltest-enable-bind-to-slave-intf.patch none

Description Damian Menscher 2006-01-30 23:58:31 UTC 
Description of problem:
I have a system with interfaces eth0 and eth1 bonded together into an interface
named bond0.  If I sniff traffic on bond0, I see all traffic going both in and
out.  But sometimes I want to see exactly which interface is carrying the
traffic (for debugging, usually).  But if I sniff traffic on eth0 (or eth1) I
only see outbound traffic, not inbound traffic.

Version-Release number of selected component (if applicable):
kernel-2.6.9-22.0.1.EL

How reproducible:
All the time

Steps to Reproduce:
1. create a bonded interface
2. sniff traffic on eth0 or eth1 (NOT bond0)
Comment 1 John W. Linville 2006-01-31 22:12:29 UTC 
What you are observing is an artifact of how bonding is implemented in the 
kernel (i.e. the hack that is bonding). 
 
Incoming frames are marked as arriving on the bond at a very low level in the 
stack, while outgoing frames on the bond are intercepted and remarked for the 
physical interface, then re-injected high enough in the stack to allow them to 
be sniffed. 
 
I agree that sniffing incoming frames on the physical links in the bond would 
be potentially beneficial, I'm not sure how to do it without breaking 
something or implementing a nasty hack.  I'll give it some thought, but I 
can't be optimistic.
Comment 2 John W. Linville 2006-02-03 21:19:38 UTC 
Created attachment 124128 [details]
jwltest-enable-bind-to-slave-intf.patch
Comment 3 John W. Linville 2006-02-03 21:20:41 UTC 
Test kernels w/ the above patch are available here: 
 
   http://people.redhat.com/linville/kernels/rhel4/ 
 
Please give them a try and post the results here...thanks!
Comment 4 John W. Linville 2006-03-01 15:18:47 UTC 
Closed due to lack of response.  Please reopen when the requested info becomes 
available...thanks!