Bug #1641429 “tcpdump capture filter for vlans incorrect” : Bugs : tcpdump package : Ubuntu

The BPF code output by tcpdump -d looks suspicious: root@nucserver:/root# tcpdump -i eno1 vlan 114 -d (000) ldb [-4048] (001) jeq #0x1 jt 2 jf 5 (002) ldb [-4052] (003) jeq #0x72 jt 4 jf 5 (004) ret #262144 (005) ret #0 There are negative offsets for the ldb commands. It seems to work though: root@nucserver:/root# tcpdump -e -i eno1 vlan 114 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eno...