If you know your range of IP addresses, you can do the following:

I have a command file called 'NETLOAD'.  Below is a listing.

ECHO PING > J1
ECHO NUMBER >> J1
ECHO 1 >> J1
ECHO RANGEPING >> J1
ECHO 123.456.789.1 >> J1
ECHO 123.456.789.255 >> J1
ECHO QUIT >> J1
nettool.net.sys < J1

This will ping every address in the IP address range for 123.456.789.xxx and
information about every successful ping will be stored in the cache.

The following command file called 'NETCACHE' will display the cache for you and
you can scan through this to find your offending MAC address.  When you find the
MAC address, the same line will contain your IP address that is duplicated.  If
you don't know who has what IP address, you will still have to go to each
machine to find it, but you might recognize the address and know exactly what
has happened.

nettool.net.sys;info="nameaddr;mappings;mapping;quit"

Below is a sample of what this looks like:

HP-XL  8:33 AM: netcache
NETTOOL Version:      B05082B3

 Enter HELP HELP for an explanation of the help facility.

 Enter HELP OPERATION for guidance on NETTOOL use.

 Commands can be abbreviated, HELP keywords cannot.

 Menu-specific commands for the ROOT:

>>>nameaddr
>>>mappings
>>>mapping
    Subnet name filter:     @
    No link address filter
    Sorting by IP address
SUBNET: LOOP
===========
127.0.0.1      Loopback

SUBNET: LAN1
===========
123.456.789.1   Ethernet address :00E01E6F8D71
123.456.789.12  802 address      :0800098178AF
123.456.789.15  Ethernet address :AA0004003410
123.456.789.20  Ethernet address :00A024CE36FF
123.456.789.30  Ethernet address :0800092D6DC5
123.456.789.35  Ethernet address :0060B011C846
123.456.789.68  Ethernet address :0060B037C525
123.456.789.71  Ethernet address :00609770B5AB
123.456.789.80  Ethernet address :080009E76EFD
123.456.789.101 Ethernet address :080009E6942C
123.456.789.106 Ethernet address :0060B037FEC3
123.456.789.181 Ethernet address :0020AF0A6494
123.456.789.220 Ethernet address :080009B459EB
123.456.159.255 Ethernet address :FFFFFFFFFFFF
123.456.159.255 802 address      :FFFFFFFFFFFF
123.456.255.255 Ethernet address :FFFFFFFFFFFF
123.456.255.255 802 address      :FFFFFFFFFFFF
255.255.255.255 Ethernet address :FFFFFFFFFFFF
255.255.255.255 802 address      :FFFFFFFFFFFF
Total number of mappings = 22
>>>quit
HP-XL  8:34 AM:


I hope that this helps.

Kevin Newman

______________________________ Reply Separator _________________________________
Subject: Duplicate IP address
Author:  Curt Brimacomb <[log in to unmask]>  at trcinternet
Date:    3/31/98 8:30 AM


Hello,

I have an error showing up on my Unix console (yes, I know this is the 3000
list).  it says:

Duplicate IP address: sent from Ethernet address 00:60:47:80:b3:ac.

Is the only way to track this down do go from PC to PC and check the NIC for
this MAC address?

TIA

Curt Brimacomb
System Manager                                        www.magiclink.com Idaho
Computer Services, Inc.                 [log in to unmask] Voice:(208) 734-2245
                                Fax:(208) 733-9663