Re: [Xen-users] Windows "modern.ie" Network Problem

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2015-01-20 at 09:24 -0200, Wanderson Camargo wrote:

> mac=13:D3:93:36:40:37

This is a multicast mac address. See
http://en.wikipedia.org/wiki/MAC_address for the meanings of the two
lowest bits in the most significant byte.

Unless you are doing something special with multicast this is unlikely
to be what you want and I wouldn't be surprised if things were filtering
such traffic in your infrastructure.

MAC addresses should either be in an OUI which has been assigned to you
by the IEEE, or you can use Xen's OUI (00:16:3e) or you can use a random
mac address with the locally administered bit set and the multicast bit
clear[0].

See http://wiki.xenproject.org/wiki/Xen_Networking#MAC_addresses on all
this.

Ian.

[0] http://www.hellion.org.uk/cgi-bin/randmac.pl can help with the
generation of properly formed randomized mac addresses.


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