[Bug 228163] ipfw & tunnel interfaces - strange tags are keeped after packet processing in kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228163

--- Comment #1 from bugs.freebsd.org at mx.zzux.com ---
via gif - in and out
00020    3326    3524078 count tag 999 ip from 216.66.80.26 to me proto 41 in
recv ext1
00020    2283     346596 count tag 998 out xmit gif1
00030    2283     392256 count ip from me to 216.66.80.26 proto 41 out xmit
ext1 tagged 998
00030    3326    3457558 count in recv gif1 tagged 999


via ng - out only
00020    307807     60722644 count tag 998 udp from any to me src-port 1701 in
recv ext1
00020         0            0 count in recv ng_l2tp tagged 998
00030      1273       106932 count tag 999 out xmit ng_l2tp
00030      1273       155306 count udp from me to any dst-port 1701 out xmit
ext1 tagged 999

00040    294012    366590329 count tag 997 ip from any to me gre in
00040         0            0 count in recv ng_pptp tagged 997
00050    194140     11160154 count tag 996 out xmit ng_pptp
00050    194239     18957853 count gre from me to any out tagged 996


vif if_ipsec - in and out
00020       28       15344 count tag 992 esp from any to me in
00020       28       13616 count in recv vpn1 tagged 992
00030        6         381 count tag 993 out xmit vpn1
00030        6         752 count esp from me to any out tagged 993


Is this bug or by design?

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