ipv6, stateful config and non-default prefixlen

[Christian Kratzer]

Hi,

On Fri, 18 Mar 2011, Eugene M. Zheganin wrote:

> Hi.
>
> I'm trying to get a working freebsd workstation with an ipv6 network where 
> addresses are received from DHCP.
> ATM my IPv6 setup copies the IPv4 layout with vlans and /24 masks, so I'm 
> using /120 prefixes.
> Is that even possible ?
> As the Handbook lacks any information about such setup, I decided to ask for 
> help here.

why not just use /64 prefixes ? You have 16 bits in your /48 to each
ipv4 /24 network to an ipv6 /64 network.

Don't fight the system.

Greetings
Christian


>
> Currently I'm having problems with prefixes.
> I'm using the net/isc-dhcp41-client port (as the dhclient from the base 
> system is unable to work with DHCPv6).
> I have a working rtadvd on a router, and a working DHCPv6 setup.
> But my client FreeBSD still gets  64 prefix length, with or without running 
> rtsold.
> Since DHCPv6 doesn't advertise any routing information at all (including the 
> prefix information), and its only function is to provide the client with an 
> address, I assume that the prefix information has to be received from the 
> router advertisements. I am currently looking at the wireshark dump, and it 
> appears that my workstation is receiving such advertisements. However it 
> doesn't affect the 64 prefix displayed in ifconfig, and all operation 
> involving the nodes outside the actual link are simply not working.
>
> Also I want to say that other operating systems on the same link are working 
> properly (for example they can exchange with nodes in other networks).
>
> Thanks.
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-- 
Christian Kratzer                      CK Software GmbH
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