protocols man page on Tru64

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protocols(4)							  protocols(4)

NAME
       protocols - Defines the Internet protocols used on the local host

SYNOPSIS
       /etc/protocols

DESCRIPTION
       The  /etc/protocols file contains information about the known protocols
       used in the Internet.  Each protocol is represented by a single line in
       the protocols file.  Each entry is of the form:

       Name Number Aliases

       The  fields contain the following information: Official Internet proto‐
       col name.  Protocol number.  Unofficial names used for the protocol.

       Items on a line are separated by one or more spaces or tab  characters.
       Comments	 begin	with the # (number sign), and routines that search the
       protocols file do not interpret characters from the beginning of a com‐
       ment to the end of the line.  A protocol name can contain any printable
       character except a field delimiter, newline character, or comment char‐
       acter.

       The lines in the file appear as follows:

       # # Internet (IP) protocols # ip	     0	  IP	     # internet proto‐
       col, pseudo protocol number icmp	   1	ICMP	   # internet  control
       message	protocol  igmp	   2	IGMP	   # internet group management
       protocol ggp	3    GGP	# gateway-gateway protocol  tcp	     6
       TCP	   #  transmission  control protocol pup     12	  PUP	     #
       PARC universal packet protocol udp     17   UDP	      # user  datagram
       protocol	 hopopt		   0	HOPOPT		  # hop-by-hop options
       for ipv6 ipv6		 41	IPV6		   #  ipv6  ipv6-route
       43     IPV6-ROUTE	 #  routing header for ipv6 ipv6-frag	    44
       IPV6-FRAG	 # fragment header for ipv6 esp		    50	   ESP
       #    encapsulating    security	payload	  ah		    51	    AH
       # authentication header ipv6-icmp       58    IPV6-ICMP	       #  icmp
       for  ipv6  ipv6-nonxt	  59	IPV6-NONXT	  # no next header for
       ipv6 ipv6-opts	    60	  IPV6-OPTS	    # destination options  for
       ipv6.oE

SEE ALSO
       Functions: endprotoent(3), getprotobyname(3), getprotobynumber(3), get‐
       protoent(3), setprotoent(3)

								  protocols(4)
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