Linux Help for ipv6

[Pekka Savola]

Hi,

Questions like this belong to, for example, linux-net mailing-list; to me,
6bone seems to generic.

If replying, please remove 6bone from Cc:.

As to the problem..

There might be some problem in router's neighbour discovery / NUD.

In any case, please install tcpdump 3.6 if not already installed, and
capture some data with 'tcpdump -n -vvv -s 512 -i any ip6'.

Please post that and the IPv6 routing table (/sbin/ip -6 r l) on the
router.

On Mon, 3 Sep 2001, Justin Hammond wrote:
> Ok,
> I'll see if you can help me.
>
> I have setup a IPV6 Tunnel and requested a subnet to my local lan.
> I'm using a Linux box running Kernel 2.4.9 on a Sparc as the gateway, and
> have several internal PC's and Servers (Win2k, NT4.0, Redhat's etc etc etc)
> and I've setup the gateway according to the howto on
> www.bieringer.de/linux/IPv6/
>
> (I wanted to use the usagi kernel, as I understand it has improved ipv6
> support, but the stable release kernel they have won't run on my sparc box,
> and the latest snapshot usually locks up, so I'm using a stock standard
> kernel, and the reason I'm using Linux, is I need to be able to firewall,
> and as far as I know, no other *nix or *bsd has stable firewall code, not to
> mention this is a production machine!)
>
> All is fine from the gateway, I can ping6 most of the 6bone sites I can find
> from both the Tunnel endpoint address, and also one of the Ip's that is
> included in my subnet routed to me.
> I've also setup radvd and it is handing out the prefix and routing
> information to the other pc's on the network.
> ipv6 forwarding has also been enabled on the box
>
> This is the problem I have:
>
> from any other PC on the internal network, I cant connect/ping past the
> gateway, *unless* I go to the gateway and ping the host first.
> then for a period of about 30 seconds, I can connect/ping only the host that
> I pinged from the gateway, but no other host past my gateway.
> after about 30 Seconds, any connections I have get droped. (for eg, right
> now, I have a ping script running in a loop, just so I can do some
> application testing!)
>
> The internal machines have the locallink ip address as the default gateway
> (fe80::a00:20ff:fec2:ad90)
> even if I manually add the global ip address, still no luck, I always get
> Destination Unreachable back from the "global" ip address of the gateway
>
> I'm not trying to do anything fancy with Mobile IP or anything, I just want
> these hosts to be accessable via IPv6.
>
> I got a feeling either I'm doing somthing stupid (as I understand it, this
> is something to do with Neighbour Solicitation, I read the RFC's but alas,
> no help)
> or there is a bug with my distro.
>
> Can anybody point me in the right direction?
>
> Thanks
>
> Justin
>
>
> ----- Original Message -----
> From: "Janos Mohacsi" <Janos.Mohacsi@dante.org.uk>
> To: "Justin Hammond" <fish@dynam.ac>
> Sent: Monday, September 03, 2001 7:10 PM
> Subject: Re: Linux Help for ipv6
>
>
> > At 05:19 PM 9/3/01 +0800, you wrote:
> > >Hi All,
> > >I'm attempting to setup a IPV6 network.
> > >but unfortuantly, i've hit a snag.
> > >Can anyone point me to a ipv6 related mailing list, that hopefully I can
> ask
> > >for help, instead of posting OT messages here?
> >
> > You can ask on this list. Either you can ask on IPv6 users mailing list:
> > http://www.ipv6.org/mailing-lists.html or you should consult Bieringer's
> > web pages: http://www.bieringer.de/linux/IPv6/
> >
> >          Janos Mohacsi
> >
> >
>

-- 
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