Check of the message type in case of DHCPv6 messages fails:

Received packet on ens7 of len 66
###[ Ethernet ]###
dst = ff:ff:ff:ff:ff:ff
src = fa:16:3e:72:fa:73
type = 0x86dd
###[ IPv6 ]###
version = 6L
tc = 0L
fl = 0L
plen = 12
nh = UDP
hlim = 32
src = 3ffe:62::1
dst = fe80::1
###[ UDP ]###
sport = dhcpv6_server
dport = dhcpv6_client
len = 12
chksum = 0xbaae
###[ DHCPv6 Advertise Message ]###
msgtype = ADVERTISE
trid = 0x0

Source IP address: OK.
Checksum: OK.

Traceback (most recent call last):
File "resources/traffic_scripts/dhcp/send_dhcp_v6_messages.py", line 342, in <module>
main()
File "resources/traffic_scripts/dhcp/send_dhcp_v6_messages.py", line 329, in main
server_ip, server_mac, proxy_to_server_mac, interface_id)
File "resources/traffic_scripts/dhcp/send_dhcp_v6_messages.py", line 174, in dhcpv6_advertise
msgtype))
RuntimeError: Message type error: 2 != ADVERTISE