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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

4649.0. "Detection of duplicate decnet/ip address?" by ZPOVC::RAMARAJ () Mon Mar 08 1993 09:55

    Since duplicate addresses can cause alot of problems in a network and
    with the proliferation of PCs/MACs and workstation on the network these
    is getting very serious.
    
    Alot of customers want to know if there are any ways in MCC to detect 
    duplicate address for DECnet, OSI or TCP/IP?
    
    Can any other vendors' product do this?
    
    Raj
    Singapore
T.RTitleUserPersonal
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4649.1LANalyzers can do thisCUJO::HILLDan Hill-Net.Mgt.-Customer ResidentThu Mar 11 1993 14:3816
    Network General's Sniffer can do this via the use of a timing
    algorithm.  It assumes that a node will send out a hello message every
    15 seconds.  
    
    If it sees a hello packet outside this range (e.g., 12 seconds), then
    it assumes there is another node on the network with the same address. 
    You can set a threshhold to give you more breathing room on very busy
    networks, though.
    
    I assume that HP will be able to do this soon, if not already, since
    their LAN monitoring utilities/hardware are getting better.
    
    DECmcc should be able to do this, also, but it doesn't.  For those of
    you who desire such functionality, please continue to lobby for it.
    
    -dan
4649.2we can find somethingUFHIS::WSIEGMUNDSeaboard riding on SeahorseFri Mar 12 1993 04:0215
If you are looking for a doubble Decnet address do:

$ mc ncp loop circuit sva-0 node 1.1 assistant node 1.1

This command is supposed to fail!
If it ever succedes you will have at least two nodes using
address 1.1 on your LAN.

Of course you can also
MCC> test node4 0 circuit.....

I have not yet tried a similar 
MCC> test station .....

Wolfgang