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Old 08-21-2014, 03:34 AM   #1
Registered: Sep 2012
Location: France
Distribution: debian
Posts: 56

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ipv6 protocol behavior

Hi all

I'm facing a strange ipv6 behavior and I don't know how to solve it because I'm not familiar with ipv6. Maybe this behavior is normal.
I hope that you will help me.
( I'm running under debian 6.0.9 with a custom kernel 3.2.58 )

machine A is "2a00:7d30:edf6:100::1" wants to ping machine B, which is "2a00:7d30:edf6:100::10". Both are on the same segment.

machine A asks for the address of machine B and I don't understand why machine B gives its global scope address instead of the local scope one ?

10:59:02.082785 IP6 2a00:7d30:edf6:100::1 > ff02::1:ff00:10: ICMP6, neighbor solicitation, who has 2a00:7d30:edf6:100::10, length 32
10:59:02.082821 IP6 2a00:7d30:edf6:100::10 > 2a00:7d30:edf6:100::1: ICMP6, neighbor advertisement, tgt is 2a00:7d30:edf6:100::10, length 32
after that machine A pings the global scope address of machine B and it works fine :

10:59:02.082927 IP6 2a00:7d30:edf6:100::1 > 2a00:7d30:edf6:100::10: ICMP6, echo request, seq 1, length 64
10:59:02.082960 IP6 2a00:7d30:edf6:100::10 > 2a00:7d30:edf6:100::1: ICMP6, echo reply, seq 1, length 64
Thank you for you help
best regards
Old 08-21-2014, 02:58 PM   #2
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Registered: Apr 2009
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The IPv6 address you used isn't local scope, such as FE80::/10.
Old 08-22-2014, 02:53 AM   #3
Registered: Sep 2012
Location: France
Distribution: debian
Posts: 56

Original Poster
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I think that I've understood my mistake.. I just made a confusion between link-layer and link-local address ...


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