And are other client pcs really getting addresses, or is it just that their leases haven’t run out yet? What happens if you release one of the leases from a “working” computer, does it correctly get a new one assigned?
Besides looking for another DHCP server, is there ANY chance someone has cross connected two networks (ie subnets/Vlans) together that both get addresses from that same DHCP server? We still have some areas with no spanning tree (not my choice) and it sort of sounds like what we would see if that were to happen. Machines try to get an address but the server thinks they’re connected on the wrong network so doesn’t hand one out. Shows up in the logs as nacks for those systems, and the clue is that you can match the mac address of the requesting system and see it’s trying to hand an address out from the wrong pool. In the same scenario, some machines still get addresses correctly. -Bonnie From: [email protected] [mailto:[email protected]] On Behalf Of Melvin Backus Sent: Friday, March 10, 2017 8:41 AM To: [email protected] Subject: [NTSysADM] RE: Unable to obtain IP from DHCP server We still haven’t had an answer to the “what do the logs say” question. They’re there for precisely this purpose. -- There are 10 kinds of people in the world... those who understand binary and those who don't. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Pierre-Marie Camilleri Sent: Friday, March 10, 2017 8:26 AM To: [email protected]<mailto:[email protected]> Subject: [NTSysADM] RE: Unable to obtain IP from DHCP server DHCP server is running on a Windows 2008 R2 domain controller It is on the same subnet and this is an existing machine. We are not having issues with new or other current machines. Just 2/3. Pierre-Marie Camilleri B.Sc. (Hons.), MBCS ICT Systems Engineer [Laferla] Direct (+356) 20939321<tel:(+356)%2020939321> Dept (+356) 20939300<tel:(+356)%2020939300> Mobile (+356) 79007864<tel:(+356)%2079007864> Email [email protected]<mailto:[email protected]> Web www.laferla.com.mt<http://www.laferla.com.mt/> Address 204A | Old Bakery Street | Valletta VLT 1453 | Malta [Facebook]<http://facebook.com/LaferlaInsurance/> [Twitter]<http://twitter.com/laferlains> [Google]<http://google.com/+laferlainsurancevalletta> [YouTube]<https://www.youtube.com/user/laferlainsurance> [ITunes]<https://itunes.apple.com/mt/app/laferla-insurance/id896547301?mt=8> [Android]<https://play.google.com/store/apps/details?id=com.conduit.app_363d89b63be84bbc8f6b85fe86fe2e01.app&hl=en> Laferla Insurance Agency Limited is licensed to act as an insurance agent for Mapfre Middlesea p.l.c. and both companies are authorised to transact insurance business by the Malta Financial Services Authority. [cid:[email protected]] Consider the environment. Do you really need to print this email? Disclaimer<http://www.laferla.com.mt/laferla-email-disclaimer> From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Melvin Backus Sent: 10 March 2017 12:56 To: [email protected]<mailto:[email protected]> Subject: [NTSysADM] RE: Unable to obtain IP from DHCP server There are numerous possible causes but without more detail it’s hard to provide anything meaningful. What DHCP server is running? Is it on the same IP subnet / vlan? Are there any log entries or either the client or the server to indicate attempts to communicate? Are these new machines or existing machines which suddently stopped getting an IP? -- There are 10 kinds of people in the world... those who understand binary and those who don't. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Pierre-Marie Camilleri Sent: Friday, March 10, 2017 5:41 AM To: [email protected]<mailto:[email protected]> Subject: [NTSysADM] Unable to obtain IP from DHCP server Hi all We are encountering a problem with some of our Windows 7 workstations and which are on the same LAN. They are unable to obtain an IP from the DHCP server and the only solution is to set a static IP which of course works. I cannot understand why this is happening to just a few. The others work fine. Could this be due to some system corruption? I’ve tried resetting the TCP/IP network stack and the Winsock all to no avail. Has anyone encountered this issue before? Any help would be much appreciated. Thanks Pierre Pierre-Marie Camilleri B.Sc. (Hons.), MBCS ICT Systems Engineer [Laferla] Direct (+356) 20939321<tel:(+356)%2020939321> Dept (+356) 20939300<tel:(+356)%2020939300> Mobile (+356) 79007864<tel:(+356)%2079007864> Email [email protected]<mailto:[email protected]> Web www.laferla.com.mt<http://www.laferla.com.mt/> Address 204A | Old Bakery Street | Valletta VLT 1453 | Malta [Facebook]<http://facebook.com/LaferlaInsurance/> [Twitter]<http://twitter.com/laferlains> [Google]<http://google.com/+laferlainsurancevalletta> [YouTube]<https://www.youtube.com/user/laferlainsurance> [ITunes]<https://itunes.apple.com/mt/app/laferla-insurance/id896547301?mt=8> [Android]<https://play.google.com/store/apps/details?id=com.conduit.app_363d89b63be84bbc8f6b85fe86fe2e01.app&hl=en> Laferla Insurance Agency Limited is licensed to act as an insurance agent for Mapfre Middlesea p.l.c. and both companies are authorised to transact insurance business by the Malta Financial Services Authority. [cid:[email protected]] Consider the environment. Do you really need to print this email? Disclaimer<http://www.laferla.com.mt/laferla-email-disclaimer>
