A new sysadmin has recently joined the company where I work (I am a software engineer and part-time sysadmin). As he's the only full-time sysadmin here, the network now falls under his purview. Today he showed me his plans for reorganisation of the network, and they involve introducing NAT on a big scale. His main arguments in favour of NAT are security (which I debunked), address shortage (which we don't have), and administrative convenience (which he never explained enough for me to see). I've argued strongly against NAT, but he's one of those people who seem to be willing to accept arbitrary amounts of pain ("we don't need to use [protocols that put IP addresses in payload]", "timeouts aren't a problem"). I'm now pointing him at some relevant RFCs. My question for the list is is there a web page or other document anywhere that comprehensively states the case against NAT? -zefram