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#92454 - 2003-07-18 11:36 AM find dhcp servers
Radimus Moderator Offline
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in a win2k AD, with win2k DHCP servers

I need to programmatically find all dhcp servers. Even those on seperate subnets/sites

help.. I'm drowning... need dhcp servers.... ack.
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#92455 - 2003-07-18 11:44 AM Re: find dhcp servers
Jochen Administrator Offline
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Yuk !

in NT Reskit there was a tool to list all DHCP servers in subnet.

Don't know the name actually but know that it's there because we had once a mix of Networks in one of our Centers and this one helped me to spot the looney
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#92456 - 2003-07-18 11:48 AM Re: find dhcp servers
Jochen Administrator Offline
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Found it :

dhcploc.exe to be found in the NT 4.0 Servers resource kit (Ummm Sup. 4 I think)

[Ooops. We're in COM forum; So you search for a script not a way to s(h)ell out, eh ?]

[ 18. July 2003, 11:56: Message edited by: Jochen ]
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#92457 - 2003-07-19 12:05 AM Re: find dhcp servers
Lonkero Administrator Offline
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and I can code it without com, but that should be little slooow.
and supports only wintosh dhcp.
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#92458 - 2003-07-19 12:26 AM Re: find dhcp servers
Jochen Administrator Offline
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Ja.

even dhcploc is a slow fart, but that is not so dependant on the code but the task to accomplish, me thinx.
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#92459 - 2003-07-18 01:00 PM Re: find dhcp servers
Radimus Moderator Offline
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it only works on the local subnet...

it basically send a request packet and displays the ack and IP of the server giving it
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#92460 - 2003-07-18 01:08 PM Re: find dhcp servers
Jochen Administrator Offline
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thats why it's slow, Ja.

But it fits your need, no ?

No, it doesn't fit; saw that now as I reread your post [Frown]

[ 18. July 2003, 13:09: Message edited by: Jochen ]
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#92461 - 2003-07-18 01:16 PM Re: find dhcp servers
Lonkero Administrator Offline
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so, my code might be better or even faster.
take all the servers in your corp into array and check their registry or wmi for running DHCP server-service [Wink]
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#92462 - 2003-07-18 01:52 PM Re: find dhcp servers
Jochen Administrator Offline
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Hmmm ... that's the easiest way.

I don't think that your environment changes too often or even dynamically regarding DHCP Servers, so this is kind of listing/surveillance script easily done by doing 


;build your array here

'List of DHCP Servers :' ? ?
for each $Server in $asServers
	shell '%ComSpec% /c xnet list \\' + $Server + ' |find /c "DHCPServer" >nul'
	if not @error
		$Server ?
	endif
next


[Wink]
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#92463 - 2003-07-18 04:59 PM Re: find dhcp servers
Radimus Moderator Offline
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If I have to code the list of servers, why not just just list the DHCP servers.

I know this is a hard one... I'm thinking that DHCP servers have to be authorized in a win2k domain, so they have to be listed in AD somewhere.
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#92464 - 2003-07-22 06:21 AM Re: find dhcp servers
BogdanSUA Offline
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Loc: Chicago
Can you tell us why you need to find DHCP servers? It might help in the end solution. Are you having problems with people bringing up unauthorized DHCP servers?
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#92465 - 2003-07-23 12:16 AM Re: find dhcp servers
Radimus Moderator Offline
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I have a WOL routine, that queries the DHCP servers for the computername/Mac address.

I want the script to automatically discover the dhcp servers without me hardcoding the server addresses.
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#92466 - 2003-07-22 01:18 PM Re: find dhcp servers
Breaker Offline
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Rad,

I know this a bit off topic (apologies for that) but is there any chance you could post what you're doing with WoL? I'm interested in using it for our remote disaster recovery site, but not sure what would be a good way to implement/use the technology.

Thanks,

Breaker
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#92467 - 2003-07-22 03:05 PM Re: find dhcp servers
Radimus Moderator Offline
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see:

http://www.kixtart.org/board/ultimatebb.php?ubb=get_topic;f=2;t=004484
http://www.kixtart.org/board/ultimatebb.php?ubb=get_topic;f=14;t=000892
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#92468 - 2003-07-22 03:51 PM Re: find dhcp servers
Sealeopard Offline
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KSMS also uses WOL, see KiXtart Systems Management Server (Part III, The Client) [a.k.a The Complete Package]
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#92469 - 2003-07-23 03:16 AM Re: find dhcp servers
Les Offline
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Rad,
All Windows 2000 DHCP servers are registered in Active Directory, so it should be simple enough to query AD for them. I was looking for a COM method but so far have only found the following Q article.

How to Use Netsh.exe to Authorize, Unauthorize and List DHCP Servers in Active Directory (303351)
http://premier.microsoft.com/premier/library/default.aspx?scid=kb;en-us;303351
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#92470 - 2003-07-23 10:15 AM Re: find dhcp servers
Jochen Administrator Offline
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Les,

you are aware that you post links for privileged ppl, are you ?

[Wink]
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#92471 - 2003-07-23 11:00 AM Re: find dhcp servers
NTDOC Administrator Offline
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Here is that link for those without the Microsoft Premier account

http://support.microsoft.com/default.aspx?scid=kb;en-us;303351

You might also be able to use code that queries the SERVERS OU in AD with code something like this.

UNTESTED CODE


For each $server in $serverlist
 $DHCP=ReadValue('HKLM\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters', 'DhcpLogFilePath')
 ? 'Server '+$server+' lists the DHCP log path as: '+$DHCP
Next
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#92472 - 2003-07-23 02:23 PM Re: find dhcp servers
Les Offline
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Registered: 2001-06-11
Posts: 12734
Loc: fortfrances.on.ca
J,
Yes, I was aware of it. That is why I also posted the full title to the Q article. I figured Rad to be privileged too.

If people are unable to find the poor man's Q article then they should be flipping burgers instead.
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#92473 - 2004-06-14 08:58 PM Re: find dhcp servers
Radimus Moderator Offline
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Loc: Tampa, FL
got it..


cmd /c netsh dhcp show server |find "Address"
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