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(usagi-users 01941) Re: Delegated aggregatable subnet from Dual stack ISP- gateway unreachable

Peter Bieringer wrote:

--On Friday, November 08, 2002 01:21:45 PM +0100 Hans Rakers
<hans@xxxxxxxx> wrote:


2001:xxx:1290::1 is the gateway provided by our ISP and up on one
of their routers. It seems the boxes are deperately trying to get a
hold of 2001:xxx:1290::1 with no luck. I dont see any router
advertisements from 2001:xxx:1290::1 on the eth0 interface.



Perhaps not configured. Also it's not recommended to send RA's with
prefix length 48...




I've
had contact with our ISP and they say everything is ok on their end.

Both boxes are on a 3Com 3300XM switch, which has a uplink to our
ISP's extremenetworks switch.

Any help will be greatly appreciated!




Looks like this is a routing/prefix issue.

In your case you have to use /48 to the ISP's network.

Dig into routing and proper prefix length usage.

To split the /48 into /64's you'll need a second router on your site.

ISP - /48 -> your router - /64 -> LAN1
                +- /64 -> LAN2
...

BTW: would be good if your ISP route the assigned /48 either via an
unnumbered or a P-t-P numbered tunnel (different addresses than /48)
to you.

Peter


Hello Peter,

Thanks for your reply. Some clarification: not the whole /48 is active yet. We were assigned a /48 but only a /64 is active atm.
The gateway ip is up and running on the ISP's Juniper m20. I've checked this using the traceroute6 tool on www.ipng.nl

Still unreachable by my test hosts though. I was told by my ISP that the only things necessary was a 'ifconfig eth0 add 2001:xxx:1290:something/64' and 'route -A inet add default gw 2001:xxx:1290::1 dev eth0' as pointed out in my first posting. I've also tried a vanilla 2.4.19 kernel this afternoon to no avail.

Could it be the switch (3Com 3300XM) not handling or forwarding multicasts properly, since there is no reply to the neighbor solicitation?

Thanks again,

Hans Rakers