> When customers of retail Internet service start demanding a NAT > standard, then that's when the IETF might want to think about > documenting the standard that the market seems to want. here's the only thing that a NAT standard should say: an intermediary MUST NOT alter the source or destination field in an IP header. an intermediary MUST NOT route an IP packet to other than its intended destination. an intermediary MUST NOT alter the payload of an IP packet.