On 7/22/05, Alex Randjelovic <alexr at atnetplus dot com> wrote:
> 
> Is it possible to create IPsec tunnel between 2 devices, one with
> dynamic IP address (dynDNS)? So in IPsec tunnel setting, instead of
> static IP address to use DynDNS name as remote gateway.
> 

been discussed a few dozen times before.
http://www.google.com/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial_s&hl=en&q=ipsec+dyndns+site%3Am0n0.ch&btnG=Google+Search

in short, you have to use mobile clients for one end.  and at that,
it's not always reliable though it works fine for some.  The current
version of racoon used in m0n0wall doesn't really support dynamic
endpoints, anything that does sort of work is a hack that's likely to
be unreliable.

-Chris