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Re: IPv6 bugs introduced in 2.4.21

To: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@xxxxxxxxxxxxxx>
Subject: Re: IPv6 bugs introduced in 2.4.21
From: Andre Tomt <andre@xxxxxxxx>
Date: 18 Jun 2003 16:10:54 +0200
Cc: netdev@xxxxxxxxxxx, usagi-users@xxxxxxxxxxxxxx
In-reply-to: <20030618.224257.130940019.yoshfuji@xxxxxxxxxxxxxx>
Organization:
References: <1055793048.24660.160.camel@xxxxxxxxxxxxxxxxxxxxxxx> <20030618.224257.130940019.yoshfuji@xxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On ons, 2003-06-18 at 15:42, YOSHIFUJI Hideaki / 吉藤英明 wrote:
> In article <1055793048.24660.160.camel@xxxxxxxxxxxxxxxxxxxxxxx> (at 16 Jun 
> 2003 21:50:48 +0200), Andre Tomt <andre@xxxxxxxxxxx> says:
> 
> > I mailed you guys a little while ago on the "unable to use
> > SOMENETWORK::0000 as a nexthop gateway" bug in 2.4.21-pre/rc a while
> > ago. It is still present in 2.4.21, rendering the "first" /128 of a
> > arbitrary prefixlen unusable - :0000. This is especially bad with /127
> > tunnels, rendering :0000 and :0001 unusable). But! There is one more
> :
> 
> This is NOT the bug but by the spec.
> prefix:: is an anycast address, not a unicast;
> you cannot use it like an unicast address.

Ok, that probably is correct. It works in 2.4.20, that does not mean
it's correct behavior though ;-)

> Well...
> 
> Do you really need to assign global address on the point-to-point device?

Yes.

> If yes, you should not use /127 prefix; please use /64 instead.

No one in their right mind assigns /64's for a linknetwork with two
peers. It's a pointopoint-link. All people I know use either /128
pointopoint or pointomultipoint semantics (BSD, KAME), or /127's as
Linux refuses to use the traditional pointopoint or peer parameter in
ifconfig and iproute for ipv6.

The /127 matches both 2a and 2b, why does it end up at localhost?



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