Ascend Archive
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Re: (ASCEND) Quake/QW and Pipeline 75 and NAT
At 09:34 AM 11/3/97 -0500, David P. Reed wrote:
>UDP does NOT have 'connections'. It is NOT required, and was NEVER
>intended that a UDP datagram must be part of a 'session' set up by some
>kind of initial datagram from the person 'opening' the 'session'. That may
>be a common use, but it is not the only use, and such a restriction was not
>intended in the original design. It's a peculiar rewrite of history to say
>(as one correspondent did) that Quake violates a rule of UDP by
>transmitting addresses in data portions of datagrams. That rule is not a
>UDP rule, but a NAT-compatibility limitation - a case where NAT does not
>work. But NAT-compatibility is not a requirement for Internet protocols -
>to the contrary, IP is an end-to-end protocol, and the IP spec says that
>certain parts of the IP datagram are to be delivered unchanged (and that
>includes the address fields). That NAT happens to work at all is a lucky
>accident.
Ahaluha! Amen brother.
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