Conclusion
As you can see, ripad2 can provide RIP gateway functionality without the complexities of a full-blown routing daemon.
rip2ad, written by Andrea Beck, is a RIP version 2 broadcast (actually multicast) utility available at http://www.ibh.de/~beck/stuff/ripper/. rip2ad provides RIP advertising functionality without having to run a full-blown routing daemon or support RIP on the local network. In the past, this functionality was often provided by bcastd; however, bcastd is no longer maintained and does not support RIP version 2.
This article is excerpted from Linux Routing, by Dee-Ann LeBlanc, Joe Brockmeier, and Ronald McCarty.