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[root@2_01 ~]# /sbin/ip -6 addr show pubeth0

inet6 2001:1::6/64 scope global inet6 2001:1::1/64 scope global inet6 fe80::20c:29ff:fe69:f9e8/64 scope link

[root@v2_01 ~]# /sbin/ip -6 addr show pubeth1

inet6 fe80::20c:29ff:fe69:f906/64 scope link

[root@2_01 ~]# ping6 fe80::20c:29ff:fe69:f9e8%pubeth1

PING fe80::20c:29ff:fe69:f9e8%pubeth1(fe80::20c:29ff:fe69:f9e8) 56 data bytes 64 bytes from fe80::20c:29ff:fe69:f9e8: icmp_seq=1 ttl=64 time=0.259 ms --- fe80::20c:29ff:fe69:f9e8%pubeth1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 286ms rtt min/avg/max/mdev = 0.259/0.259/0.259/0.000 ms

[root@2_01 ~]# ping6 fe80::20c:29ff:fe69:f9e8%pubeth0

PING fe80::20c:29ff:fe69:f9e8%pubeth0(fe80::20c:29ff:fe69:f9e8) 56 data bytes 64 bytes from fe80::20c:29ff:fe69:f9e8: icmp_seq=1 ttl=64 time=0.057 ms --- fe80::20c:29ff:fe69:f9e8%pubeth0 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 390ms rtt min/avg/max/mdev = 0.057/0.057/0.057/0.000 ms

Why can I ping6 "fe80::20c:29ff:fe69:f9e8" via pubeth1?

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  • Which OS is this? I cannot reproduce the symptoms on Ubuntu 14.04. Commented Aug 25, 2014 at 8:46
  • [root@2_01 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.5 (Santiago) Commented Aug 25, 2014 at 10:39
  • Could you include output of cat /proc/version? Commented Aug 25, 2014 at 10:42
  • [root@2_01 ~]# cat /proc/version Linux version 2.6.32-431.11.2.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Mon Mar 3 13:32:45 EST 2014 Commented Aug 25, 2014 at 10:44
  • I realized this behavior might not only depend on the kernel but also on the ping6 command. This is due to ping6 doing a few things on its own that other programs let the kernel do. May be worth checking if the problem affects other programs like for example ssh. Commented Aug 25, 2014 at 10:57

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