VPN server does not work when a second network adapter is enabled

I have an Xserve providing DNS, filesharing, and VPN services on an office LAN. The server sits behind a gateway router and is set as a DMZ host.
VPN has been working absoluely flawlessly on the server for some time. However, I've recently discovered that this all changes when the Xserve's second ethernet adapter is enabled.
To illustrate:
en0: static IP 192.168.2.250
en1: disabled
VPN works perfectly
en0: static IP 192.168.2.250
en1: static IP 192.168.2.251
DNS settings unchanged, DMZ host unchanged
VPN doesn't work
The above is even true when attempting to connect internally.
VPN is configured for L2TP, and when the second NIC is connected the VPN server logs the following (below). There are a number of other users of Lion Server users that seem to be experiencing the same log pattern, but there doesn't seem to be a definitive solution.
I was wondering if anyone has any advice on how I could solve this problem? Is it possible to bind the VPN server to a specified network adapter?
Thanks in advance for any help or ideas.
(And to preempt the question of "why do you need to use both NICs", the two interfaces are to be used for load balancing. See https://discussions.apple.com/message/17655599?ac_cid=142432)
Wed Feb 22 15:53:53 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:53:53 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:53:53 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:53:53 2012 : L2TP received SCCRQ
Wed Feb 22 15:53:53 2012 : L2TP sent SCCRP
2012-02-22 15:53:54 GMT          Incoming call... Address given to client = 192.168.2.229
Wed Feb 22 15:53:54 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:53:54 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:53:54 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:53:54 2012 : L2TP received SCCRQ
Wed Feb 22 15:53:54 2012 : L2TP sent SCCRP
2012-02-22 15:53:56 GMT          Incoming call... Address given to client = 192.168.2.220
Wed Feb 22 15:53:56 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:53:56 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:53:56 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:53:56 2012 : L2TP received SCCRQ
Wed Feb 22 15:53:56 2012 : L2TP sent SCCRP
2012-02-22 15:54:00 GMT          Incoming call... Address given to client = 192.168.2.221
Wed Feb 22 15:54:00 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:54:00 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:54:00 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:54:00 2012 : L2TP received SCCRQ
Wed Feb 22 15:54:00 2012 : L2TP sent SCCRP
2012-02-22 15:54:04 GMT          Incoming call... Address given to client = 192.168.2.222
Wed Feb 22 15:54:04 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:54:04 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:54:04 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:54:04 2012 : L2TP received SCCRQ
Wed Feb 22 15:54:04 2012 : L2TP sent SCCRP
2012-02-22 15:54:08 GMT          Incoming call... Address given to client = 192.168.2.226
Wed Feb 22 15:54:08 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:54:08 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:54:08 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:54:08 2012 : L2TP received SCCRQ
Wed Feb 22 15:54:08 2012 : L2TP sent SCCRP
2012-02-22 15:54:12 GMT          Incoming call... Address given to client = 192.168.2.223
Wed Feb 22 15:54:12 2012 : Directory Services Authentication plugin initialized
Wed Feb 22 15:54:12 2012 : Directory Services Authorization plugin initialized
Wed Feb 22 15:54:12 2012 : L2TP incoming call in progress from 'xxx.xxx.xxx.xxx'...
Wed Feb 22 15:54:12 2012 : L2TP received SCCRQ
Wed Feb 22 15:54:12 2012 : L2TP sent SCCRP
2012-02-22 15:54:13 GMT             --> Client with address = 192.168.2.228 has hungup
2012-02-22 15:54:14 GMT             --> Client with address = 192.168.2.229 has hungup
2012-02-22 15:54:16 GMT             --> Client with address = 192.168.2.220 has hungup
2012-02-22 15:54:20 GMT             --> Client with address = 192.168.2.221 has hungup
2012-02-22 15:54:24 GMT             --> Client with address = 192.168.2.222 has hungup
2012-02-22 15:54:28 GMT             --> Client with address = 192.168.2.226 has hungup
2012-02-22 15:54:32 GMT             --> Client with address = 192.168.2.223 has hungup

Try switching the order of the services in System Preferences > Network.
Put the second one at the top.
HTH,
b.

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