Windows Vista SP1 client not getting ip address from 3750

This reminds me of something I saw.

I have 877 router as DHCP server and Vista, not sure about SP level when this was happening but now SP1.

I have extensive experience of Cisco DHCP on XP and it just works.

With vista DHCP was OK on Ethernet but not on Wireless. Wireless DHCP worked with other (cheap non cisco) WiFi routers.

I found that changing a registry setting, (something about DHCP broadcast reply? if I recall correctly) swapped the behaviour round. i.e. worked on cisco 877 but did not work on other routers.

Upgrade router to 12.4(15)T7 from something already not too old fixed it.

So I think that there is something going on here but don't know what it is. I do not have a wireless sniffer so never figured it out.

Maybe if you upgrade your 3750 to the latest sw it will magically work:)

I found this today:-

Deploying Microsoft Windows Server 2008 and Vista on a Cisco Network

It mentions that if IP V6 is enabled - and on vista it is enabled by default - vista does not get round to doing IP V4 DHCP for 128 seconds!!! after link up. I don't think I see that but maybe it has been changed by Microsoft since the Document was written.

This reminds me of something I saw.

I have 877 router as DHCP server and Vista, not sure about SP level when this was happening but now SP1.

I have extensive experience of Cisco DHCP on XP and it just works.

With vista DHCP was OK on Ethernet but not on Wireless. Wireless DHCP worked with other (cheap non cisco) WiFi routers.

I found that changing a registry setting, (something about DHCP broadcast reply? if I recall correctly) swapped the behaviour round. i.e. worked on cisco 877 but did not work on other routers.

Upgrade router to 12.4(15)T7 from something already not too old fixed it.

So I think that there is something going on here but don't know what it is. I do not have a wireless sniffer so never figured it out.

Maybe if you upgrade your 3750 to the latest sw it will magically work:)

I found this today:-

Deploying Microsoft Windows Server 2008 and Vista on a Cisco Network

It mentions that if IP V6 is enabled - and on vista it is enabled by default - vista does not get round to doing IP V4 DHCP for 128 seconds!!! after link up. I don't think I see that but maybe it has been changed by Microsoft since the Document was written.

I solved the same problem on two Vista laptops with this command (must be executed from cmd prompt in elevated mode): netsh winsock reset catalog

You have to restart your Windows after this. Make sure that your registry settings regarding dhcp are defaults, so don't turn on broadcast flag bit, etc. Only in the case that above command doesn't works for you proceed with registry modification according to MS KB article. My Vista has been working ok with all dhcp servers with no problem, but after installing drivers for USB 3G mobile internet stick I lost the ability to obtain IP address from my home wirelles router and also from Microsoft DHCP server in my company if my client is behind DHCP relay (Cisco 3750 with ip helper command), but I could obtain IP address if I where in the same broadcast domain as MS DHCP server. After reseting some stuff with above command I've restored my ability to obtain IP from my wirelles home routet and also from my company server even if I'm behind DHCP relay.

Regards, Igor

I will try this today.

Thanks

"Igor Mamuzic aka Pseto" wrote in message news:gne3ut$q68$ snipped-for-privacy@ss408.t-com.hr...

Tried everything nothing works and won't get a dhcp address from the 3750 dhcp pool.

Have you tried any debug commands for DHCP on the 3750? We don't use our Ciscos for DHCP so I'm not familiar with what there is. There shouldn't be that much traffic so it shouldn't break your terminal session.

Sam