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To: markk@knigma.org
Cc: freebsd-current@FreeBSD.ORG
Subject: Re: IPv6 diagnostic VMWARE 2 beta
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Date: Thu, 02 Mar 2000 11:29:10 +0900
From: Yoshinobu Inoue <shin@nd.net.fujitsu.co.jp>
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> World of 20000228 under VMWARE 2.0-468 under NT4.
> 
> Is this one for VMWARE?
> 
> lnc0 = bridged adapter (network cable disconnected)
> lnc1 = host adapter
> 
> The following kernel diagnostics are presented during boot.
> 
> lnc0: starting DAD for fe80:0001::0250:56ff:fe98:95ec
> lnc1: starting DAD for fe80:0002::0250:56ff:fee7:93ca
> lnc0: DAD detected duplicate IPv6 address fe80:0001::0250:56ff:fe98:95ec
> : 1 NS, 0 NA
> lnc0: DAD complete for fe80:0001::0250:56ff:fe98:95ec - duplicate found
> lnc0: manual intervention required
> lnc1: DAD complete for fe80:0002::0250:56ff:fee7:93ca - no duplicates
> found
> -- 
> Mark Knight

The above log message is of IPv6 duplicated address detection.
It is defined in RFC2462, and briefly it does following
things, on each of connected interfaces.

  -Automatically create own addr.
  -But before actually enable it, do link local multicast
   query for the addr to the assocated interface, to check if
   there is already same addr assigned to another host.
  -Usually it success if no reply is obtained in some period,
   and fails if an reply is obtained.
   (It think same addr is already used by some other host.)

So this procedure will fail in following cases.

  -Its own outstanding multicast packets are copyied back from network.
  -The interface is in PROMISCUS mode. (e.g. tcpdump is
   exec,ed on the interface.)

I have not ever used VMWARE, but I suppose the above lnc0 is
VMWARE's virtual bridging interface and copying back its own
outstanding multicast packets?


Yoshinobu Inoue


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