how to host asp.net website with dynamic ip?

Question

hello friends

i had hosted my site in iis on 192.168.1.178 with 80 port. i access my site on all network amchines it was working correctly. but today i tried to access this ip to access my website i was issued following error message.
could not access 192.168.1.178
for that i found my server ip had been changed by router.the current ip is 192.168.1.179. i wanted my website to work on dynamic ip. how to host my website in iis on dynamic ip?
plz help