RE: ip6-localhost (::1) 2990.86 ms !H -> Why ?

From: NDSoftware (extml@ndsoftware.net)
Date: Sun Nov 18 2001 - 05:54:14 EST


> -----Original Message-----
> From: Pekka Savola [mailto:pekkas@netcore.fi]
> Sent: Sunday, November 18, 2001 11:39 AM
> To: NDSoftware
> Cc: linux-net@vger.kernel.org
> Subject: RE: ip6-localhost (::1) 2990.86 ms !H -> Why ?
>
>
> On Sun, 18 Nov 2001, NDSoftware wrote:
> > > -----Original Message-----
> > > From: Pekka Savola [mailto:pekkas@netcore.fi]
> > > Sent: Sunday, November 18, 2001 11:07 AM
> > > To: NDSoftware
> > > Cc: linux-net@vger.kernel.org
> > > Subject: RE: ip6-localhost (::1) 2990.86 ms !H -> Why ?
> > >
> > >
> > > On Sun, 18 Nov 2001, NDSoftware wrote:
> > > > > > traceroute to 6bone.net (3ffe:b00:c18:1::10) from
> > > > > 3ffe:8271:2101:1::1,
> > > > > > 30 hops max, 16 byte packets
> > > > > > 1 ip6-localhost (::1) 2990.86 ms !H 2999.53 ms !H
> > > 2999.92 ms !
> > > > > >
> > > > > > Routes on Woody:
> > > > > >
> > > > > > Kernel IPv6 routing table
> > > > > > Destination Next Hop
> > > > > > Flags Metric Ref Use Iface
> > > > > > ::1/128 ::
> > > > > > U 0 0 0 lo
> > >
> > > > > > 3ffe:8271:2101:1::1/128 ::
> > > > > > U 0 8 1 lo
> > > > > > 3ffe:8271:2101:1::/64 ::
> > > > > > UA 256 594 0 eth0
> > >
> > > Please also remove these two routes above (at least the
> former), as
> > > pointed out in the 6bone etc lists.
> >
> > route -A inet6 del 3ffe:8271:2101:1::1/128 dev lo
> > SIOCDELRT: No such process
> >
> > I can't remove it.
> >
> > If i add a another ip to eth0 et /128 route for lo will be
> created :(
>
> Hmm, it may be that I'm misremembering your network topology.
>
> In short, locally assigned addresses should have a /128 route
> to loopback.

Yes.

> The on-link prefix (/64) should have a /64 route to Ethernet.

Yes.

>
> Off-link prefixes should not have routes, except a default or
> a 2000::/3
> route to the link-local address of the gateway. Global
> address of the
> gateway also works, but is deprecated and is easier to get broken.
>
> >
> > traceroute6 fe80::2d0:70ff:fe01:811b
> > connect: Invalid argument
>
> ping6 -I eth0 fe80::2d0:70ff:fe01:811b

PING fe80::2d0:70ff:fe01:811b(fe80::2d0:70ff:fe01:811b) from ::1 eth0:
56 data bytes
64 bytes from fe80::2d0:70ff:fe01:811b: icmp_seq=1 ttl=64 time=119 usec
64 bytes from fe80::2d0:70ff:fe01:811b: icmp_seq=2 ttl=64 time=88 usec
64 bytes from fe80::2d0:70ff:fe01:811b: icmp_seq=3 ttl=64 time=84 usec
 
--- fe80::2d0:70ff:fe01:811b ping statistics ---
3 packets transmitted, 3 received, 0% loss, time 1998ms
rtt min/avg/max/mdev = 0.084/0.097/0.119/0.015 ms

>
> With link-local addresses, the interface must always be
> specified, in some
> way or another.
>
> When that works, try ping6'ing the global address of your
> gateway. If
> that doesn't work, most probably your gateway has wrong
> routes pointing
> towards your system (and return packets get lost).

PING fe80::a0:2434:1d91(fe80::a0:2434:1d91) from
fe80::2d0:70ff:fe01:811b eth0: 56 data bytes
>From ::1 icmp_seq=1 Destination unreachable: Address unreachableFrom ::1
icmp_seq=2 Destination unreachable: Address unreachableFrom ::1
icmp_seq=3 Destination unreachable: Address unreachableFrom ::1
icmp_seq=4 Destination unreachable: Address unreachableFrom ::1
icmp_seq=5 Destination unreachable: Address unreachableFrom ::1
icmp_seq=6 Destination unreachable: Address unreachable
--- fe80::a0:2434:1d91 ping statistics ---
8 packets transmitted, 0 received, +6 errors, 100% loss, time 7029ms

fe80::a0:2434:1d91 is the link adddress of eth2 of the router.

I understand why with the same configuration Potato ping router and
6bone but Woody not.

>
> Hope this helps.

Thanks very much.
>
> --
> 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
>
>

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This archive was generated by hypermail 2b29 : Fri Nov 23 2001 - 21:00:38 EST