is this before or after a reboot ?
also ACL's have a deny any any at the end. so you will have to redo the whole ACL to add that line in ...
do a show run, copy all the access-list 5 statements into notepad
do a no access-list 5 in global config
in notepad add access-list 5 permit 10.10.30.18
then past the new acl in....
wr mem
and that should do it.
We must go always forward, not backward
always up, not down and always twirling twirling towards infinity.