https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270417
Bug ID: 270417
Summary: tcpdump does not capture any packets on lagg(4)
interface when choosing receive direction
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Observed the problem while repeating
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240106#c28
A minimal script to repeat:
```
#!/bin/sh
epa=$( ifconfig epair create )
epb=${epa%a}b
lagg=$( ifconfig lagg create laggport $epa )
ifconfig $epa up
ifconfig $lagg up
j0=$( jail -ic vnet persist )
ifconfig $epb vnet $j0
jexec $j0 ifconfig $epb inet 192.168.1.2/24
tmp=$( mktemp )
nohup tcpdump -nvi $lagg --direction in > $tmp &
jexec $j0 ping -t5 -c3 192.168.1.1
kill $!
jail -R $j0
ifconfig $lagg destroy
ifconfig $epa destroy
cat $tmp
rm $tmp
```
The output:
==============
PING 192.168.1.1 (192.168.1.1): 56 data bytes
--- 192.168.1.1 ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss
tcpdump: listening on lagg0, link-type EN10MB (Ethernet), capture size 262144
bytes
0 packets captured
0 packets received by filter
0 packets dropped by kernel
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