[Dibbler] relay server configuration - icmpv6 port unreachable

Salim Engin salim.engin at gmail.com
Wed Feb 13 20:34:58 CET 2013


Hi Tomasz,

Indeed, the desstination is a unicast address.
I have wireshark captures in the attachment.
I will check the user guide and try the solution .

Thanks

Salim

On Wed, Feb 13, 2013 at 8:05 PM, Tomasz Mrugalski <thomson at klub.com.pl>wrote:

> On 13.02.2013 11:07, Salim Engin wrote:
> >
> > 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
> What does the relay forward messages to? What's the destination address?
>
> If the relay agent has not been explicitly configured, it MUST use the
> All_DHCP_Servers multicast address as the default. See section 20 of
> RFC3315. It seems that dibbler properly listens on that port. Perhaps
> your relay sends the packets to specific unicast address? That is
> allowed behavior, but Dibbler server must be explicitly configured to
> listen on that address. See examples of "unicast" in server.conf. They
> are explained in Dibbler User's Guide somewhere.
>
> Hope that helps,
> Tomek
>
> _______________________________________________
> http://klub.com.pl/cgi-bin/mailman/listinfo/dibbler
>
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