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

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George Sheng

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

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

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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George Sheng

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

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 <[hidden email]> 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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