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

From: Pekka Savola (pekkas@netcore.fi)
Date: Sun Nov 18 2001 - 09:33:31 EST


On Sun, 18 Nov 2001, NDSoftware wrote:

Ok, these pings look sane.

A few pointers on what to check.

 - Make sure Woody is listening to solicited-node multicast address
(ff02::1:fe01:811b) -- netstat -g
 - Make sure Router is listening to solicited-node multicast address
(ff02::1:ff34:1d91) -- netstat -g

 - Make sure the ethernet interfaces have MULTICAST flag in them
(ifconfig)
 - If you are using PCMCIA cards, you could try also putting ALLMULTI flag
on the interface(s); e.g. Xircom cards are buggy in this aspect.

 - Make sure Woody's link local address is configured properly; before
this, check that loopback0 is up, then:

/sbin/ip -6 a a fe80::2d0:70ff:fe01:811b/10 dev eth0

 - Make sure Router's link local address is configured properly; before
this, check that loopback0 is up, then:

/sbin/ip -6 a a fe80::a0:2434:1d91/10 dev eth2

 - Capture tcpdump on woody with 'tcpdump -vvv -s 500 -w tcpdump.log -n
ip6' and send the file to me privately. I'm mostly interested in
possible neighbour solicitation options that are used.

 - Show the most up-to-date routing table on both nodes. Preferable
output is '/sbin/ip -6 r l'.

 - Show the most up-to-date interface addresses on both nodes. Preferable
output is '/sbin/ip -6 a l'.

The latter could also be mailed to me directly if you prefer.

I hope this is enough to get started..

> On Woody, i ping router:
>
> ping6 -I eth0 fe80::a0:2434:1d91
> 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 unreachable
> --- fe80::a0:2434:1d91 ping statistics ---
> 6 packets transmitted, 0 received, +3 errors, 100% loss, time 5026ms
>
> On router, when i try to ping it from Woody:
>
> 14:12:15.259604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
> 14:12:16.259604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
> 14:12:17.259604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
> 14:12:18.289604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
> 14:12:19.289604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
> 14:12:20.289604 fe80::2d0:70ff:fe01:811b > ff02::1:ff34:1d91: icmp6:
> neighbor sol: who has fe80::a0:2434:1d91
>
> On router, i ping Woody:
>
> PING fe80::2d0:70ff:fe01:811b(fe80::2d0:70ff:fe01:811b) from
> fe80::a0:2434:1d91 eth2: 56 data bytes
> >From ip6-localhost: Destination unreachable: Address unreachable
> >From ip6-localhost: Destination unreachable: Address unreachable
> >From ip6-localhost: Destination unreachable: Address unreachable
>
> --- fe80::2d0:70ff:fe01:811b ping6 statistics ---
> 4 packets transmitted, 0 packets received, 100% packet loss
>
> On Woody, when i try to ping it from router:
>
> 14:10:35.301780 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b
> 14:10:36.294003 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b
> 14:10:37.293058 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b
> 14:10:38.296243 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b
> 14:10:39.292719 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b
> 14:10:40.293872 fe80::a0:2434:1d91 > ff02::1:fe01:811b: icmp6: neighbor
> sol: who has fe80::2d0:70ff:fe01:811b

-- 
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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