[Dibbler] Solicit Client-Id Problem

Куприяшин Михаил kmickle at yandex.ru
Wed Apr 1 11:52:49 CEST 2015

Greetings, Dibbler community!

I have a Windows Server 2008 machine with two separate Ethernet 
interfaces. The first one is connected to LAN and configured with static 
IPv4. The second is connected to WAN and uses DHCP to get both IPv4 and 
IPv6 leases.

Ever since the IPv6 protocol was enabled, I have problems getting an 
IPv6 lease. Sometimes the address is absent. Sometimes it is present for 
~1 hour after the boot, but the machine is unable to renew the lease.

Careful analysis of DHCPv6 traffic showed, that the Solicit message 
broadcasted from the WAN interface is malformed: being sent from the 
second (WAN) interface it has the MAC address of the first (LAN) 
interface in the "Link-Local Address" field of the Solicit message. So, 
the Advertise messages sent in reply are discarded, as if they are 
intended for another machine.

Even more curious: sometimes the machine IS able to get and refresh the 
lease, but the "working" Solicit message is still malformed as described 

The problem appears either with the Dibbler client and with the regular 
Windows client. I appreciate any information or help on the issue. 
Provider's technical support is trying to identify the problem, but they 
have had no luck so far; no reply from Microsoft community either.
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