[138643] in North American Network Operators' Group
Re: ipv6 question
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Mar 11 14:22:26 2011
To: ann kok <oiyankok@yahoo.ca>
In-Reply-To: Your message of "Fri, 11 Mar 2011 11:15:36 PST."
<735479.99562.qm@web111316.mail.gq1.yahoo.com>
From: Valdis.Kletnieks@vt.edu
Date: Fri, 11 Mar 2011 14:21:54 -0500
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Fri, 11 Mar 2011 11:15:36 PST, ann kok said:
> inet6 addr: fe80::20c:29ff:fe3c:92a1/64 Scope:Link
This is a link level address, only valid on one interface. So you need to look
at which interface it is attached to in the ifconfig output.
> ping6 fe80::20c:29ff:fe3c:92a1
> connect: Invalid argument
ping6 wants the interface name for link-scope addresses, because on some
hardware setups, the same MAC is used for all interfaces, which means that
each interface has the same link-scope address. So to disambiguate it,
you have to feed it the interface name so it knows which link to use.
On my laptop, I currently have:
wlan0 Link encap:Ethernet HWaddr 00:24:D6:53:C5:BA
inet6 addr: fe80::224:d6ff:fe53:c5ba/64 Scope:Link
% ping fe80::224:d6ff:fe53:c5ba%wlan0
ping6 fe80::224:d6ff:fe53:c5ba%wlan0
PING fe80::224:d6ff:fe53:c5ba%wlan0(fe80::224:d6ff:fe53:c5ba) 56 data bytes
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=1 ttl=64 time=0.072 ms
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=2 ttl=255 time=0.081 ms
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=3 ttl=255 time=0.090 ms
^C
--- fe80::224:d6ff:fe53:c5ba%wlan0 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.072/0.081/0.090/0.007 ms
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