Can't seem to make dhcrelay or dhcpd working(receive) for DHCPv6

[George Sheng]

Never mind. Forgot to check the firewall, and need to punch a hole in
ip6tables.

George

On Thu, Dec 15, 2016 at 5:57 PM, George Sheng <georgesheng14 at gmail.com>
wrote:

>
> I'm playing with the ISC dhcp 4.3.5 code, on centos 6 and 7 hosts.
>
> client                           relay or server
>  host1 <-- ethernet --> host2
>       vlan20                 vlan20
>
> I can see the dhclient send out solicit packets from host1, and
> tcpdump on host2 prints out it gets the packets:
>
> tcpdump -i enp3s0.20 udp -vv:
>
> 17:44:23.377713 IP6 (hlim 1, next-header UDP (17) payload length: 71)
> fe80::211:2fff:fe85:8cf4.dhcpv6-client > ff02::1:2.dhcpv6-server: [udp
> sum ok] dhcp6 solicit (xid=8cb62a (client-ID hwaddr/time type 1 time
> 535166114 00112f858cf4) (option-request DNS-server DNS-search-list)
> (elapsed-time 709) (Client-FQDN) (IA_NA IAID:797281524 T1:3600 T2:5400))
>
> 17:44:31.365915 IP6 (hlim 1, next-header UDP (17) payload length: 71)
> fe80::211:2fff:fe85:8cf4.dhcpv6-client > ff02::1:2.dhcpv6-server: [udp
> sum ok] dhcp6 solicit (xid=8cb62a (client-ID hwaddr/time type 1 time
> 535166114 00112f858cf4) (option-request DNS-server DNS-search-list)
> (elapsed-time 1508) (Client-FQDN) (IA_NA IAID:797281524 T1:3600 T2:5400))
>
>
> But the dhcrelay never receives any packet on the vlan20 interface:
>
>
> relay/dhcrelay -6 -d -l enp3s0.20 -u e3s0.10
>
> [sudo] password for naiming:
>
> Internet Systems Consortium DHCP Relay Agent 4.3.5
>
> Copyright 2004-2016 Internet Systems Consortium.
>
> All rights reserved.
>
> For info, please visit https://www.isc.org/software/dhcp/
>
> Bound to *:547
>
> Listening on Socket/enp3s0.10
>
> Sending on   Socket/enp3s0.10
>
> Listening on Socket/enp3s0.20
>
> Sending on   Socket/enp3s0.20
>
>
> I have debugs inside the socket code trying to see if there is any
> receiving packet, no.
>
>
> Has anyone have experience on this DHCPv6 setup? maybe this is particular
> to vlan?
>
> thanks.
>
>
> George
>
>
>
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