Re: RFC 1918

If the only excuse for outlawing RFC 1918 router interface addresses is breaking path MTU discovery, then it seems to me that it should be perfectly legal to use RFC 1918 addresses for most router point-to-points; the only place where the Path MTU Discovery argument could possibly apply would be when a box routes between different interfaces onto links with different link MTUs. Considering how often Path MTU Discovery doesn't work, folks normally try pretty hard to avoid that circumstance anyway, so I'd expect a great many routers to be able to be assigned RFC 1918 addrs on their point-to-points with no operational problems. -Bennett