Can't Renew IP From ISP

[tertone100]

Info: before I installed ISA I used RRAS with nat and had no problem renewing my lease from my isp. If I left my server running or rebooted I always got an ip (and it was even the same one). But I noticed that if I did ipconfig/release & /renew, it could not find the dhcp server.This was not a problem because it automaticly renew it's ip every 24 hrs, it was just somthing I noticed. Since I installed ISA server I have to reboot my server every morning to renew my ip. I have enabled and configured the dhcp packet packet filter, disabled APIPA in the reg and read all the relivent docs from isaserver.org many times. I'm using UDP ports 67&68 both directions and have tried lots of different configs in the filter and in ISA (I dont think this the problem). When I check my ip configs I get an ip of 24.200.x.x and the ip of the ISP's dhcp is a private address of 10.23.125.2, I cannot ping this address but somehow when I reboot my computer or cable modem can communicate with the dhcp and renew the ip?. It is not a PPPOE connection and I think that authentication occurs through the modem. I think that maby the brodcast for a renewal is different at reboot then from isa server. Is somthing else blocking the request?? Thanks tertone100

 

[MoltenUniverse]

Have you activated the DHCP Packet Filter?

 

[tertone100]

Yes it is enabled, I also noticed that if my computer is turned off at the time that my lease expires I have to re-set the modem first then re-start. Also my Isp does not support proxies or firewalls with dynamic ip's.

 

[MoltenUniverse]

Have you installed Windows SRP1?

Believe me: Don´t install it!

I have a week of headache after installed SRP1 on my ISA machine. I was losing my routing table w/ no reason.

My simptom was, suddenly my externar connection stops. So i had to stop my FW service, disable my Cable connection, reactivate it and after thism and only after this i was the service up and running. It was a hell.

(My english is not so good. If you couldn´t get what i would to say above, please let me know... ;-) )

 

[tertone100]

I have installed SP2 and SP1 for ISA. I know that it is my cable modem that communicates with the dhcp by its mac address. With out ISA server, my computer sends a request for a renewell to the cable modem and the cable modem forwards a request to the ISP dhcp and "it works". With ISA , the request is not going to the modem even with the filter configured correctly. ???

 

[MoltenUniverse]

If you run IPCONFIG on your machine, the DHCP Server of your cable modem is 10.xxx.xxx.xxx or it´s other IP?

If your machine is 24.200.xxx.xxx, what is its network mask?

Don´t give up, Spectreman! ;-)

 

[MoltenUniverse]

Take a look at Q244268!

Tell me if worx!

 

[tertone100]

I'll check it out, thanks.