I'm setting up a dhcpv6 server and seeing the initial request come, and
the server replies, however the reply is not getting out on any of the
network interfaces.
tshark -V -n -i <interface> ip6 and \(port 546 or port 547\)
dhcp server (centos 7)
ens192 - Primary network for access
ens224 - one dhcp v4 vlan
ens256 - another dhcp v4 vlan + dhcpv6
Oct 9 17:57:45 dhcp01 dhcpd: Solicit message from
fe80::4a77:46ff:fef9:bc06 port 546, transaction ID 0xF021F100
Oct 9 17:57:45 dhcp01 dhcpd: Picking pool address 2607:f678:1fff:1011::1caa
Oct 9 17:57:45 dhcp01 dhcpd: Picking pool prefix 2607:f678:2fff::/60
Oct 9 17:57:45 dhcp01 dhcpd: Sending Advertise to
fe80::4a77:46ff:fef9:bc06 port 546
> 13870 select(6, [4 5], [], NULL, NULL) = 1 (in [5])
> 13870 recvmsg(5, {msg_name={sa_family=AF_INET6, sin6_port=htons(546), inet_pton(AF_INET6, "fe80::4a77:46ff:fef9:bc06", &sin6_addr), sin6_flowinfo=htonl(0), sin6_scope_id=if_nametoindex("ens256")}, msg_namelen=28, msg_iov=[{iov_base="\1\361!\360\0\10\0\2\377\377\0\6\0\36\0\21\0\25\0\26\0\27\0\30\0\37\08\0@\0C"..., iov_len=65536}], msg_iovlen=1, msg_control=[{cmsg_len=36, cmsg_level=SOL_IPV6, cmsg_type=0x32}], msg_controllen=40, msg_flags=0}, 0) = 107
> 13870 socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 7
> 13870 ioctl(7, SIOCGIFINDEX, {ifr_name="ens256", }) = 0
> 13870 close(7) = 0
> 13870 sendto(3, "<30>Oct 9 17:39:27 dhcpd: Solic"..., 109, MSG_NOSIGNAL, NULL, 0) = 109
> 13870 sendto(3, "<31>Oct 9 17:39:27 dhcpd: Picki"..., 73, MSG_NOSIGNAL, NULL, 0) = 73
> 13870 sendto(3, "<31>Oct 9 17:39:27 dhcpd: Picki"..., 66, MSG_NOSIGNAL, NULL, 0) = 66
> 13870 sendto(3, "<30>Oct 9 17:39:27 dhcpd: Sendi"..., 82, MSG_NOSIGNAL, NULL, 0) = 82
> 13870 socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 7
> 13870 ioctl(7, SIOCGIFINDEX, {ifr_name="ens256", }) = 0
> 13870 close(7) = 0
> 13870 sendmsg(5, {msg_name={sa_family=AF_INET6, sin6_port=htons(546), inet_pton(AF_INET6, "fe80::4a77:46ff:fef9:bc06", &sin6_addr), sin6_flowinfo=htonl(0), sin6_scope_id=0}, msg_namelen=28, msg_iov=[{iov_base="\2\361!\360\0\3\0(\0\0\0\1\0\0\16\20\0\0\34 \0\5\0\30&\7\366x\37\377\20\21"..., iov_len=184}], msg_iovlen=1, msg_control=[{cmsg_len=36, cmsg_level=SOL_IPV6, cmsg_type=0x32}], msg_controllen=36, msg_flags=0}, 0) = 184
> 13870 select(6, [4 5], [], NULL, NULL <detached ...>
I note the reply is going to the link local address, which makes sense
since it doesn't have anything else yet, but I'm not sure how it figures
out how to route it, and ping6 seems confused too:
ping6 fe80::4a77:46ff:fef9:bc06
connect: Invalid argument
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