Bug ID 1041381: Tcpdump capture might not include broadcast and multicast egress (generated by the system and being sent out) when "--dls true" option is used

Last Modified: May 29, 2024

Affected Product(s):
F5OS Velos(all modules)

Fixed In:
F5OS-C 1.3.0

Opened: Aug 17, 2021

Severity: 3-Major

Symptoms

When DLS feature is enabled using the "--dls true" option, broadcast and multicast packets generated by the host CPUs of the system and egressing out of the VELOS system will not be part of the capture. The default mode when no "--dls" option is specified is "--dls false", which functions correctly.

Impact

Capture will not be complete and will not contain the egressing broadcast and multicast packets.

Conditions

The 'DLS' feature of tcpdump is enabled by explicitly invoking packet capture with the non-default mode "--dls true".

Workaround

Use the default mode (no "--dls" option specified) or explicitly turn off dls mode ("--dls false").

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips