RE: rfc 1918?

It is my intention to avoid having 1918 addresses leaving my network. At our egress points the filters are fairly short -- they allow only traffic with our IP source addresses to leave. This was my interpretation of the RFC's. Some in this discussion seem to be saying that we should also filter for RFC1918 destinations. Am I reading this correctly? I can see that packets destined for RFC1918 addresses will leave our network (due to default routes) but are promptly dropped at the first BGP speaking router they encounter. Is it worth the extra router processing time to check all outgoing packet destinations as well? I can't see where this extra filtering is worth the trouble. Mark Radabaugh VP, Amplex (419)833-3635 mark@amplex.net