AirPort Extreme Crash during PPTP connect using VPN on demand

I can reproduce this crash consistently every time.
My AEBSn is running 7.4.2. My MBP is running 10.6.2.
I set up a PPTP connection, tick "send all traffic over VPN connection" in the advanced options.
I add a domain to the "VPN on Demand" list and apply changes.
I click connect, and the AEBS light immediately goes amber. A few seconds later, it's back to green and everything is groovy...unless I try to connect again.
The problem is solved by simply removing the domain from "VPN on Demand."
Here's the relevant snippet from ppp.log:
Sat Jan 30 00:22:36 2010 : PPTP connecting to server 'xxxx.xxxx.xxx' (xx.xxx.xx.xx)...
Sat Jan 30 00:22:37 2010 : PPTP connection established.
Sat Jan 30 00:22:37 2010 : Using interface ppp0
Sat Jan 30 00:22:37 2010 : Connect: ppp0 <--> socket[34:17]
Sat Jan 30 00:22:40 2010 : pptpwaitinput: Address deleted. previous interface setting (name: en0, address: 10.0.1.14), deleted interface setting (name: en0, family: Ether, address: 10.0.1.14, subnet: 255.0.0.0, destination: 10.0.1.255).
Sat Jan 30 00:22:40 2010 : linked service found: Setup:/Network/Service/C1126C24-140A-4AE4-A35D-553148185E2F/Interface
Sat Jan 30 00:22:40 2010 : starting wait-interface timer for pptp: 20 secs
Sat Jan 30 00:22:51 2010 : pptpwaitinput: Address deleted. previous interface setting (name: en0, address: 10.0.1.14), deleted interface setting (name: en1, family: Ether, address: 10.0.1.5, subnet: 255.0.0.0, destination: 10.0.1.255).
Sat Jan 30 00:23:00 2010 : pptpwait_interfacetimeout: 20 secs TIMEOUT waiting for interface to be reconfigured. previous setting (name: en0, address: 10.0.1.14).
Sat Jan 30 00:23:00 2010 : PPTP has detected change in the network and lost connection with the server.
Sat Jan 30 00:23:00 2010 : Connection terminated.
Sat Jan 30 00:23:00 2010 : PPTP disconnecting...
Sat Jan 30 00:23:00 2010 : PPTP disconnected
Funny, huh?

Hi
I have had this problem with my Airport Extreme since day 1 and it is extremely irritating. Using Windows Vista, Windows 7, Windows Server 2008 and Windows Server 2003 I can crash the router any time I like (or more to the point, really really dislike) by simply initiating a PPTP VPN from any client (wired or wireless) behind the Airport Extreme. The device flashes orange, drops everyone's internet connection and then about a minute later, comes back up again.
Whenever I have to connect to another site using VPN, I need to use NextG internet connection instead of my home cable connection. Any help with this would be gold because other than this really annoying problem (oh and the 'must reboot everytime you make a minor modification to configuration' requirement) I find it a great rock solid wireless access point.

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