A while ago, I tried to setup my SpeedTouch 510 ADSL modem with DHCP-spoofing. My ISA 2000 server received the correct IP-address and after enabling the built-in DHCP-client packet filter, my internet connection was stable.
After upgrading to ISA 2004, my internet connection isn't stable anymore when using DHCP-spoofing. I created access rules allowing all trafic on ports 67 and 68 from localhost to external network and vice versa, but nothing helps. I also adapted the DHCP lease time in the modem's config, but still, my modem keeps on disconnecting and after a second or two it connects again.
Has anyone seen this kind of behaviour and does anyone know of a solution?
In my situation it doesn't. My Internet is disconnected when idle for a few minutes. The disconnection lasts about 3 secondsand then Internet comes up again. 3 Seconds is not long, but long enough to be very annoying. My guess was it had something to do with the DHCP-lease. The standard lease-time is 30 seconds. When I extend the lease-time, the internet-connection goes down again and doesn't come up on it's own, until the lease has expired.
In ISA 2000 this worked perfect after enabling the standard DHCP-client packet filter.
I've found out what really happens. When the DHCP-lease has expired, my ISA server should require a new DHCP-lease. The time my ISA server is requesting a new lease, the CPU utilization is at 100%. The services wspsrv.exe and isastg.exe are both at 50%.
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All Forums >> [ISA Server 2004 Firewall] >> General >> ISA 2k4 and DHCP Spoofing 
ISA 2k4 and DHCP Spoofing - 
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