[Bug 229226] net/tcpdump ... wrong interface capturing

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229226

            Bug ID: 229226
           Summary: net/tcpdump ... wrong interface capturing
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: garga at FreeBSD.org
          Reporter: feh at fehcom.de
             Flags: maintainer-feedback?(garga at FreeBSD.org)
          Assignee: garga at FreeBSD.org

tcpdump behaves erratically capturing packets:

1. IPv6 packets are not correctly captured to an interface (see  below).
2. Capturing IPv4 packets on the loopback IF lo0 though does not work. 

root at bigchief:/home/djbdns/DEVELOP/VERS_2/djbdnscurve6-29/compile # tcpdump -i
lo0 -vvvv udp port 53
tcpdump: listening on lo0, link-type NULL (BSD loopback), capture size 262144
bytes
11:35:12.033774 IP6 (hlim 64, next-header UDP (17) payload length: 40)
fd00::1:21e:90ff:fead:5a07.22884 > fd00::1:21e:90ff:fead:5a07.domain: [bad udp
cksum 0xd1e2 -> 0x93e8!] 6765+ A? www.spiegel.de. (32)
11:35:12.033968 IP6 (hlim 64, next-header UDP (17) payload length: 40)
fd00::1:21e:90ff:fead:5a07.22884 > fd00::1:21e:90ff:fead:5a07.domain: [bad udp
cksum 0xd1e2 -> 0xb378!] 64193+ AAAA? www.spiegel.de. (32)
11:35:12.034279 IP6 (hlim 64, next-header UDP (17) payload length: 170)
fd00::1:21e:90ff:fead:5a07.domain > fd00::1:21e:90ff:fead:5a07.22884: [bad udp
cksum 0xd264 -> 0x62f2!] 6765 q: A? www.spiegel.de. 7/0/0 www.spiegel.de. [0s]
CNAME aacfb9d106f4.link11.de., aacfb9d106f4.link11.de. [4m57s] A
128.65.210.181, aacfb9d106f4.link11.de. [4m57s] A 128.65.210.185,
aacfb9d106f4.link11.de. [4m57s] A 128.65.210.183, aacfb9d106f4.link11.de.
[4m57s] A 128.65.210.180, aacfb9d106f4.link11.de. [4m57s] A 128.65.210.182,
aacfb9d106f4.link11.de. [4m57s] A 128.65.210.184 (162)

FreeBSD bigchief.fehnet.de 11.0-RELEASE-p15 FreeBSD 11.0-RELEASE-p15 #0: Tue
Nov 14 08:04:40 UTC 2017    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

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