[Dibbler] relay server configuration - icmpv6 port unreachable

Salim Engin salim.engin at gmail.com
Wed Feb 13 11:07:34 CET 2013


Hi all,

I have been trying a setup where  dibbler dhcpv6 server has to assign ipv6
via relay .
dhcpv6 relay is a router between client and dhcpv6 server .

Without relay, if the client is connected to server directly, it can get
ipv6 address. But if it is connected through relay, even though dhcpv6
server receives dhcpv6 relay forw  message, it does not send relay reply.
Instead, I see "icmpv6 port unreachable"  being sent to router .
It does not matter if dhcpv6 server is running or not. This message is
always sent .

icmpv6 port unreachable message is sent if the port is not available.
However, as the server provides IP to the directly connected users and as
we see udp port 547 is open, why the linux sends that message ?

debian:/etc/dibbler# lsof -i :547
COMMAND   PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
dibbler-s 706 root    5u  IPv6 12955868      0t0  UDP
[ff05::1:3]:dhcpv6-server
dibbler-s 706 root    6u  IPv6 12955871      0t0  UDP
[ff02::1:2]:dhcpv6-server


Your help is appreciated .
Thanks
Kind Regards

Salim Engin
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