NAME 名稱

protocols - 協(xié)議定義文件  

描述

該文件為普通 ASCII 文件，它描述了 TCP/IP 子系統(tǒng)中各類 DARPA internet 協(xié)議族．你應該參考這個文件, 而不是使用 ARPA 的 include 文件中的號碼, 更不必去猜測它們. 這些號碼將出現(xiàn)在任何 ip 包頭的協(xié)議字段中.

你應該保持這個文件不變, 因為修改會導致不正確的 ip 包. 協(xié)議號碼和名字由 DDN 網(wǎng)絡信息中心指定.

每行的格式如下:

協(xié)議 號碼 別名 ...

這里的字段以空格或者 tab 鍵分隔. 空行和以散列符 (#) 開頭的行將忽略. 從散列符起始的行的剩余部分也將忽略.

字段描述如下:

協(xié)議

協(xié)議的本名.例如 :ip, tcp 或者 udp.

號碼

協(xié)議的正式號碼, 它將出現(xiàn)在 ip 包頭中.

別名

協(xié)議的可選別名.

該文件也可以使用網(wǎng)絡范圍中的名字服務，如黃頁/NIS 或 BIND/Hesoid，在網(wǎng)絡分發(fā)．

文件

/etc/protocols

協(xié)議定義文件.

參見

getprotoent(3)

#p#

NAME

protocols - the protocols definition file  

DESCRIPTION

This file is a plain ASCII file, describing the various DARPA internet protocols that are available from the TCP/IP subsystem. It should be consulted instead of using the numbers in the ARPA include files, or, even worse, just guessing them. These numbers will occur in the protocol field of any ip header.

Keep this file untouched since changes would result in incorrect ip packages. Protocol numbers and names are specified by the IANA (Internet Assigned Numbers Authority).

Each line is of the following format:

protocol number aliases ...

where the fields are delimited by spaces or tabs. Empty lines are ignored. If a line contains a hash mark (#), the hash mark and the part of the line following it are ignored.

The field descriptions are:

protocol

the native name for the protocol. For example ip, tcp, or udp.

number

the official number for this protocol as it will appear within the ip header.

aliases

optional aliases for the protocol.

This file might be distributed over a network using a networkwide naming service like Yellow Pages/NIS or BIND/Hesiod.

FILES

/etc/protocols

The protocols definition file.

SEE ALSO

getprotoent(3)