You can disable RIP on a point-to-point link through the file /etc/gateways. This file does not come with your operating system: you must create it with a text editor.
Become superuser.
Edit /etc/gateways and add the following entry:
norip ipdptpn |
where ipdptpn represents the device name of the point-to-point PPP interface used.
For more information, refer to the in.routed(1M) man page.