Why would my router have different MAC addresses for IP and IPv6 transactions?

Posted by user329161 on Super User See other posts from Super User or by user329161
Published on 2014-06-04T02:51:03Z Indexed on 2014/06/04 3:27 UTC
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Filed under:

router

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IPv6

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mac-address

Today I was using tcpdump and I noticed my computer was having IPv6 traffic with a particular MAC address that I could not match with an IP using nmap or arping. After looking at the tcpdump logs a little more closely, I figured out it was another MAC address my router was using but exclusively for IPv6 traffic.

22:49:01.936830 90:0d:cb:ff:31:91 (oui Unknown) > 33:33:00:00:00:01 (oui Unknown), ethertype IPv6 (0x86dd), length 158: fe80::920d:cbff:feff:3191 > ip6-allnodes: ICMP6, router advertisement, length 104

Why would a router offer a different MAC address for IPv6?

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