(usagi-users 00873) Default route in router mode Re: Re: How can I enable global IPv6 forwarding in kernel

[You Yamagata <youy@xxxxxxxxxxxxx>]

Hi, I just happened to meet with this default route problem 
in router mode, so please let me report it.

I use usagi-20010917-linux22 with Vine Linux (RH6.2 based dist.),
and use Freenet6's /48 prefix delegation service. 

I built kernel with CONFIG_IPV6_EN_DFLT to 'Y' and set default route 
to sit1 as follows:

route -A inet6 add default dev sit1

But, I couldn't access to outer network from client machie in LAN. 

So I added route to my router Linux Box as follows:

route -A inet6 add 3ffe::0/16 dev sit1
route -A inet6 add 2001::0/16 dev sit1

In this setting, the client machine in LAN succeed to access outer network.
So I think default route is not used in router mode.

Does anyone know how to enable default route in router mode?

--
You Yamagata 
E-mail: youy@xxxxxxxxxxxxx, youy@xxxxxxxxxxxxx




> On Fri, 12 Oct 2001, Parijat Mishra wrote:
> > On Tuesday 09 October 2001 14:22, you wrote:
> > > Please also note a Linux kernel feature:  in Router mode, default route
> > > will not work for forwarded packets.
> >
> > There's a kernel compilation option where you can specify that default route
> > be used.
> 
> Do you mean?
> 
> IPv6: allow default route when forwarding is enabled
> CONFIG_IPV6_EN_DFLT
>   Do not purge default route(s) in router mode.  Say Y.
> 
> Basically this is in addrconf.c r1.25; the removal of
> 'rt6_purge_dflt_routers(0);' in addrconf_forward_change.
> 
> As far as I can see, this affects only whether default route, possibly
> obtained in Host mode by autoconfiguration, is retained when changing to
> Router mode.
> 
> You still will get 'Destination unreachable: Address unreachable' from the
> router, I believe.
> 
> -- 
> Pekka Savola                 "Tell me of difficulties surmounted,
> Netcore Oy                   not those you stumble over and fall"
> Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords
> 
> 
>