root@e894f6f58040:/tmp/usr/sbin# ./tcpdump -i br-freifunk icmp6

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on br-freifunk, link-type EN10MB (Ethernet), capture size 65535 bytes
20:32:26.518155 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:32:27.521492 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:32:28.520168 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:32:29.520171 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:32:35.954879 IP6 fe80::3e97:eff:fe9d:b5f1 > ff02::1: ICMP6, echo request, seq 1, length 64
20:32:35.955116 IP6 fe80::ea94:f6ff:fef5:8040 > fe80::3e97:eff:fe9d:b5f1: ICMP6, echo reply, seq 1, length 64
20:32:53.273126 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:33:11.780939 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:33:26.946337 IP6 fe80::3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:36.272927 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:33:38.669235 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:39.668558 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:39.670259 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:40.668593 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:40.670154 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:41.670166 IP6 2001:67c:20a0:b111:ea94:f6ff:fef5:8040 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:43.702137 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:44.700602 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:45.700639 IP6 2001:67c:20a0:b111:3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:33:46.672499 IP6 fe80::3e97:eff:fe9d:b5f1 > fe80::ea94:f6ff:fef5:8040: ICMP6, neighbor solicitation, who has fe80::ea94:f6ff:fef5:8040, length 32
20:33:46.672704 IP6 fe80::ea94:f6ff:fef5:8040 > fe80::3e97:eff:fe9d:b5f1: ICMP6, neighbor advertisement, tgt is fe80::ea94:f6ff:fef5:8040, length 24
20:34:00.684945 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:34:22.977196 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:34:28.736412 IP6 fe80::3e97:eff:fe9d:b5f1 > fe80::ea94:f6ff:fef5:8040: ICMP6, neighbor solicitation, who has fe80::ea94:f6ff:fef5:8040, length 32
20:34:28.736632 IP6 fe80::ea94:f6ff:fef5:8040 > fe80::3e97:eff:fe9d:b5f1: ICMP6, neighbor advertisement, tgt is fe80::ea94:f6ff:fef5:8040, length 24
20:34:46.248806 IP6 fe80::1 > ff02::1: ICMP6, router advertisement, length 88
20:34:49.479252 IP6 fe80::3e97:eff:fe9d:b5f1 > ff02::1:ff00:1: ICMP6, neighbor solicitation, who has fe80::1, length 32
20:34:51.824336 IP6 fe80::3e97:eff:fe9d:b5f1 > fe80::ea94:f6ff:fef5:8040: ICMP6, neighbor solicitation, who has fe80::ea94:f6ff:fef5:8040, length 32
20:34:51.824549 IP6 fe80::ea94:f6ff:fef5:8040 > fe80::3e97:eff:fe9d:b5f1: ICMP6, neighbor advertisement, tgt is fe80::ea94:f6ff:fef5:8040, length 24