null routes and VPN's

Hello,

is it a wise idea to put a default route on the inside (trusted) side of
a firewall with a high metric for when a VPN drops. Essentially,
blackholing all traffic until the VPN comes back and the default route
is again the end of the VPN?

Assuming there is a rule on the outside which allows only VPN traffic
from the other end (point to point and only traffic allowed through the
VPN) should both ends of the VPN have null routes for when its down (
for traffic within the VLAN for this VPN)?

What would be the implementation side affects, something along the lines
of once the VPN is up its a matter of timeout on the routing protocol
(say OSPF) to propagate the default route? Should a modernish firewall
do this automagically anyway??

Cheers,
Kerry.

-- 
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