have cisco/805 in remote branch office, connecting it to public network [internet], and have a corpoarte vpn over that link, connecting branch office with head office through vpn. now, wan provider is [for some reason] changing the ip address of branch office link.
of course, in the moment the branch office router ip address change, vpn tunnel branch-head breaks [since the remote address is written into local router's config].
but, if the head office's router is readjusted, so new branch office ip address is written into head's router's config, could i expect that vpn branch-head may be reconnected automaticly [or with power switching of equipment]?
or the same question, but reformulated: is it the must for the router to know its own wan address to operate in vpn tunnel network over public network?
i am interested in problem, because if remote ip address change may not be performed automaticly, i need to pay engineer to adjust remote router manualy.
any suggestion/oppinion?
thnx.