Re: [ActiveDir] OT: WMI to retrieve DHCP leases
Thanks, I'll look at NMAP. One of the issues is that we still have a good amount (~1000) of Windows 95 in use. So the don't show up on alot of tools (OLDCMP, ADUC, etc.) We only have 2 DHCP servers so I know that if they get a lease I can count them which is what I'm concerned about right now. I can take the count, subract the NT/2K/XP computers and have a decent count of 95 computers. Thanks for the suggestions. Mitch On 1/26/06, Gil Kirkpatrick [EMAIL PROTECTED] wrote: Another tack to take is to use something like NMAP. It's a very effective IP discovery tool. I suppose it all depends on what you mean by out there. Counting objects in AD will tell you the computers have been joined to the domain at some point. They might or might not exist anymore, and if they exist, they might not be in use. Counting DHCP leases will tell you the computers that use DHCP and are on a subnet covered by a DHCP scope. It won't tell you anything about computers with static addresses, or computers whose lease has expired. And you have to know where all your DHCP servers (they might be routers or switches or WAPs (!), and not Windows servers). And some of the leases may be for printers and copiers and such, which might not fit your definition of a computer. UsingNMAPwilltellyouallthedevicesthatarereachableonthesubnetsyouspecify, areturnedon,andhavealoadedIPstack.The nicethingaboutNMAPisthatitwilltellyouwhatkindofadeviceitis,whatOSisloaded,andwhatservicesarerunningonit. It won't tell you anything about devices that aren't turned on. None of these schemes will tell you about standalone computers not on the network. Would you consider a non-networked computer out there? Some combination of the three (with appropriate duplicate removal) could give you a very accurate count. -gil From: [EMAIL PROTECTED] [mailto: [EMAIL PROTECTED]] On Behalf Of Brian DesmondSent: Thursday, January 26, 2006 7:14 PM To: ActiveDir@mail.activedir.orgSubject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is a much better metric than computers joined to the domain for this. You can't count non-domain-joined devices with any AD tool. Chances are however these devices have a DHCP lease. Thanks, Brian Desmond [EMAIL PROTECTED] c - 312.731.3132 From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED]Sent: Thu 1/26/2006 8:05 PMTo: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is NOT the authoritative source for how many computers are out thereIf you could, grab Joe's oldcomp tool and just run it against your domain.You should get something close to accurate from there. Sincerely,Dèjì Akómöláfé, MCSE+M MCSA+M MCTMicrosoft MVP - Directory Serviceswww.readymaids.com - we know ITwww.akomolafe.comDo you now realize that Today is the Tomorrow you were worried about Yesterday? -anonFrom: [EMAIL PROTECTED] on behalf of Mitch ReidSent: Thu 1/26/2006 12:55 PMTo: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] OT: WMI to retrieve DHCP leasesNo, I need to get a count of how many computers are out there. I'm lacking agood authoritative source and want to use the DHCP servers as a count. My script works that runs NETSH (for each scope on each server) but I like tokeep everything in VB/WMI when possible.Thanks for the replies.On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP: Would you be happy with pulling the info on the client side? You could use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtainedor DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [ mailto:[EMAIL PROTECTED]] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a _vbscript_ to pull current DHCP leases from a2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit.However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive:http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspxList FAQ : http://www.activedir.org/ListFAQ.aspxList archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
Re: [ActiveDir] OT: WMI to retrieve DHCP leases
No, I need to get a count of how many computers are out there. I'm lacking a good authoritative source and want to use the DHCP servers as a count. My script works that runs NETSH (for each scope on each server) but I like to keep everything in VB/WMI when possible. Thanks for the replies. On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP:Would you be happy with pulling the info on the client side? You could useWin32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtained or DHCPLeaseExpire values.back to my rabiit hole, folks :)Sincerely,Dèjì Akómöláfé, MCSE+M MCSA+M MCTMicrosoft MVP - Directory Serviceswww.readymaids.com - we know ITwww.akomolafe.comDo you now realize that Today is the Tomorrow you were worried aboutYesterday?-anonFrom: [EMAIL PROTECTED] on behalf of Alain LissoirSent: Wed 1/25/2006 6:45 PMTo: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leasesThere is no WMI exposure of the DHCP settings and data. Sorry.From: [EMAIL PROTECTED][mailto:[EMAIL PROTECTED]] On Behalf Of Mitch ReidSent: Wednesday, January 25, 2006 1:08 PMTo: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leasesI'm trying to write a _vbscript_ to pull current DHCP leases from a 2003 DHCPserver.I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit.Howeverit doesn'tappear to be able to pull leases.Is this possible?Thanks, Mitch.List info : http://www.activedir.org/List.aspxList FAQ: http://www.activedir.org/ListFAQ.aspxList archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
DHCP is NOT the authoritative source for how many computers are out there If you could, grab Joe's oldcomp tool and just run it against your domain. You should get something close to accurate from there. Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Mitch Reid Sent: Thu 1/26/2006 12:55 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] OT: WMI to retrieve DHCP leases No, I need to get a count of how many computers are out there. I'm lacking a good authoritative source and want to use the DHCP servers as a count. My script works that runs NETSH (for each scope on each server) but I like to keep everything in VB/WMI when possible. Thanks for the replies. On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP: Would you be happy with pulling the info on the client side? You could use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtained or DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a VB script to pull current DHCP leases from a 2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit. However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ: http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ: http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
DHCP is a much better metric than computers joined to the domain for this. You can't count non-domain-joined devices with any AD tool. Chances are however these devices have a DHCP lease. Thanks, Brian Desmond [EMAIL PROTECTED] c - 312.731.3132 From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED] Sent: Thu 1/26/2006 8:05 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is NOT the authoritative source for how many computers are out there If you could, grab Joe's oldcomp tool and just run it against your domain. You should get something close to accurate from there. Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Mitch Reid Sent: Thu 1/26/2006 12:55 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] OT: WMI to retrieve DHCP leases No, I need to get a count of how many computers are out there. I'm lacking a good authoritative source and want to use the DHCP servers as a count. My script works that runs NETSH (for each scope on each server) but I like to keep everything in VB/WMI when possible. Thanks for the replies. On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP: Would you be happy with pulling the info on the client side? You could use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtained or DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a VB script to pull current DHCP leases from a 2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit. However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ: http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ: http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ winmail.dat
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
Title: RE: [ActiveDir] OT: WMI to retrieve DHCP leases Another tack to take is to use something like NMAP. It's a very effective IP discovery tool. I suppose it all depends on what you mean by "out there". Counting objects in AD will tell you the computers have been joined to the domain at some point. They might or might not exist anymore, and if they exist, they might not be in use. Counting DHCP leases will tell you the computers that use DHCP and are on a subnet covered by a DHCP scope. It won't tell you anything about computers with static addresses, or computers whose lease has expired. And you have to know where all your DHCP servers (they might be routers or switches or WAPs (!), and not Windows servers). And some of the leases may be for printers and copiers and such, which might not fit your definition of a computer. UsingNMAPwilltellyouallthedevicesthatarereachableonthesubnetsyouspecify, areturnedon,andhavealoadedIPstack.The nicethingaboutNMAPisthatitwilltellyouwhatkindofadeviceitis,whatOSisloaded,andwhatservicesarerunningonit. It won't tell you anything about devices that aren't turned on. None of these schemes will tell you about standalone computers not on the network. Would you consider a non-networked computer "out there"? Some combination of the three (with appropriate duplicate removal) could give you a very accurate count. -gil From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian DesmondSent: Thursday, January 26, 2006 7:14 PMTo: ActiveDir@mail.activedir.orgSubject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is a much better metric than computers joined to the domain for this. You can't count non-domain-joined devices with any AD tool. Chances are however these devices have a DHCP lease. Thanks, Brian Desmond [EMAIL PROTECTED] c - 312.731.3132 From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED]Sent: Thu 1/26/2006 8:05 PMTo: ActiveDir@mail.activedir.orgSubject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is NOT the authoritative source for "how many computers are out there"If you could, grab Joe's oldcomp tool and just run it against your domain.You should get something close to accurate from there.Sincerely,Dèjì Akómöláfé, MCSE+M MCSA+M MCTMicrosoft MVP - Directory Serviceswww.readymaids.com - we know ITwww.akomolafe.comDo you now realize that Today is the Tomorrow you were worried aboutYesterday? -anonFrom: [EMAIL PROTECTED] on behalf of Mitch ReidSent: Thu 1/26/2006 12:55 PMTo: ActiveDir@mail.activedir.orgSubject: Re: [ActiveDir] OT: WMI to retrieve DHCP leasesNo, I need to get a count of how many computers are out there. I'm lacking agood authoritative source and want to use the DHCP servers as a count.My script works that runs NETSH (for each scope on each server) but I like tokeep everything in VB/WMI when possible.Thanks for the replies.On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP: Would you be happy with pulling the info on the client side? Youcould use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtainedor DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a _vbscript_ to pull current DHCP leases from a2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit.However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive:http://www.mail-archive.com/activedir%40mail.activedir.org/List info : http://www.activedir.org/List.aspxList FAQ : http://www.activedir.org/ListFAQ.aspxList archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
Title: RE: [ActiveDir] OT: WMI to retrieve DHCP leases You have a point. Except that if your DNS scavenging and lease duration are not in synch, then you get a highly skewed report. I understand your point about non-domain-members. Deji From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Desmond Sent: Thursday, January 26, 2006 6:14 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is a much better metric than computers joined to the domain for this. You can't count non-domain-joined devices with any AD tool. Chances are however these devices have a DHCP lease. Thanks, Brian Desmond [EMAIL PROTECTED] c - 312.731.3132 From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED] Sent: Thu 1/26/2006 8:05 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases DHCP is NOT the authoritative source for how many computers are out there If you could, grab Joe's oldcomp tool and just run it against your domain. You should get something close to accurate from there. Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Mitch Reid Sent: Thu 1/26/2006 12:55 PM To: ActiveDir@mail.activedir.org Subject: Re: [ActiveDir] OT: WMI to retrieve DHCP leases No, I need to get a count of how many computers are out there. I'm lacking a good authoritative source and want to use the DHCP servers as a count. My script works that runs NETSH (for each scope on each server) but I like to keep everything in VB/WMI when possible. Thanks for the replies. On 1/26/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: To the OP: Would you be happy with pulling the info on the client side? You could use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtained or DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a _vbscript_ to pull current DHCP leases from a 2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit. However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mitch ReidSent: Wednesday, January 25, 2006 1:08 PMTo: ActiveDir.OrgSubject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a _vbscript_ to pull current DHCP leases from a 2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit. However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch.
RE: [ActiveDir] OT: WMI to retrieve DHCP leases
To the OP: Would you be happy with pulling the info on the client side? You could use Win32_NetworkAdapterConfiguration and retrieve the DHCPLeaseObtained or DHCPLeaseExpire values. back to my rabiit hole, folks :) Sincerely, Dèjì Akómöláfé, MCSE+M MCSA+M MCT Microsoft MVP - Directory Services www.readymaids.com - we know IT www.akomolafe.com Do you now realize that Today is the Tomorrow you were worried about Yesterday? -anon From: [EMAIL PROTECTED] on behalf of Alain Lissoir Sent: Wed 1/25/2006 6:45 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] OT: WMI to retrieve DHCP leases There is no WMI exposure of the DHCP settings and data. Sorry. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mitch Reid Sent: Wednesday, January 25, 2006 1:08 PM To: ActiveDir.Org Subject: [ActiveDir] OT: WMI to retrieve DHCP leases I'm trying to write a VB script to pull current DHCP leases from a 2003 DHCP server. I can do it with NETSH but I'd like to do it only with WMI in VBS. The closest I could find was dhcpobj.dll from the 2000 Resource Kit. However it doesn't appear to be able to pull leases. Is this possible? Thanks, Mitch. List info : http://www.activedir.org/List.aspx List FAQ: http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
