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Date: Tue, 26 Sep 1995 18:14:44 -0500
Subject: Re: Why is Windows NT sending this pack
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Subject: Re: Why is Windows NT sending this pack
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Date: Tue, 26 Sep 1995 16:08:00 -0400
To: Larry Helber <lhelber @
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From: pnh1rgr @
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Subject: Re: Why is Windows NT sending this packet ? (fwd)
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At 02:18 PM 9/26/95, Larry Helber wrote:
>
>
>>
>>
>>On Sep 26, 2:45pm, Torsten Sturm (CIP 89) wrote:
>>> Subject: Why is Windows NT sending this packet ? (fwd)
>>>...
>>> Does anyone know why my Windows NT Server v3.5 would be sending packets
to...
>>>
>>> Name: MICROSOFT.MCAST.NET
>>> Address: 224.0.1.24
>>>
>>> I happened upon this with a packet analyzer yesterday. I am NOT aware of
>>> configuring ANYTHING having to do with "MICROSOFT.MCAST.NET"?
>>
>> Network 224 is a "special" network. It really refers to your local
>>network (I think).
>>
>
>IP address in the range of 224.0.0.1-239.255.255.255 are multicast address
>with a special attribute. Instead of the destination being a single machine
>it is a group of machines that have made a request to their NIC to receive
>any packets to this address. The most common place you will see this is with
>routers to send updates. Multicasting works the same as broadcasting except
>only the hosts that want to recieve the packets will see them.
>
>This does not explain why NT is sending request on this address. The only
>thing I can think of would be it is how it handles the concepts of "groups"
>for NetBIOS over TCP/IP.
>
>
Actually, if you do the command ROUTE PRINT, you will find that WIN NT is a
mutlicast router. NT is capable of selective routing of IP including
multicast
net 224. This can be/is (jury is still out) a problem. Local MBONE and
Multicast is a good thing. Becoming part of a Wide-area multicast group
could be a problem. NT really can only route 224 between its own NIC's (I
think). Normally, you need a UN!X box running mrouted to link multicasts
between networks.
---------------------------------------------------------------
Bob Resino (RGR24) pnh1rgr @
pnh10 .
med .
navy .
mil (804)398-7400
Healthcare Support Office Fax:(804)398-7265
Medical Construction Liaison Department
Management Information / Data-telecommunciations Div (Code 55)
6500 Hampton Blvd "To be or not to be...
Norfolk, VA 23707 What was the question ?"
---------------------------------------------------------------
The opinions are mine, NOT those of the Navy or the Healthcare
Support Office. If they happen to be the same, its got to be
coincidence!
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