Preview:
pi@pi /etc/default $ sudo tcpdump -i eth0 port 547
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
21:21:36.935479 IP6 2a02:1234:420a:112d::1.dhcpv6-server > 2a02:1234:420a:100b::10.dhcpv6-server: dhcp6 relay-fwd
21:21:36.942854 IP6 2a02:1234:420a:100b::10.dhcpv6-server > 2a02:1234:420a:112d::1.dhcpv6-server: dhcp6 relay-reply
21:21:36.951406 IP6 2a02:1234:420a:112d::1.dhcpv6-server > 2a02:1234:420a:100b::10.dhcpv6-server: dhcp6 relay-fwd
21:21:36.955437 IP6 2a02:1234:420a:100b::10.dhcpv6-server > 2a02:1234:420a:112d::1.dhcpv6-server: dhcp6 relay-reply
21:22:16.092006 IP6 2a02:1234:420a:112d::1.dhcpv6-server > 2a02:1234:420a:100b::10.dhcpv6-server: dhcp6 relay-fwd
21:22:16.094353 IP6 2a02:1234:420a:100b::10.dhcpv6-server > 2a02:1234:420a:112d::1.dhcpv6-server: dhcp6 relay-reply
21:22:16.169193 IP6 2a02:1234:420a:112d::1.dhcpv6-server > 2a02:1234:420a:100b::10.dhcpv6-server: dhcp6 relay-fwd
21:22:16.171748 IP6 2a02:1234:420a:100b::10.dhcpv6-server > 2a02:1234:420a:112d::1.dhcpv6-server: dhcp6 relay-reply
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