icmp man page on DigitalUNIX

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icmp(7)								       icmp(7)

       icmp - Internet Control Message Protocol

       #include <sys/socket.h> #include <netinet/in.h>

       The  following  is  the	socket call for sockets using the IPv4 address

       s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

       The following is the socket call for sockets  using  the	 IPv6  address

       s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

       The  Internet  Control Message Protocol (ICMP) is the error and control
       message protocol used by the Internet Protocol (IP)  and	 the  Internet
       Protocol	 family.   It may be accessed through a raw socket for network
       monitoring and diagnostic functions. ICMP sockets  are  connectionless,
       and  are normally used with the sendto() and recvfrom() functions.  The
       connect() function may also be used to fix the destination  for	future
       packets, in which case the read() or recv() and write() or send() func‐
       tions may be used.

       Outgoing packets automatically have an  IP  header  prepended  to  them
       (based  on the destination address). Incoming packets are received with
       the IP header and options intact.

       If a socket operation fails, errno may be set to one of	the  following
       values: The socket is already connected.	 This error occurs when trying
       to establish connection on a socket or when trying to send  a  datagram
       with  the  destination address specified.  The destination address of a
       datagram was not specified, and the socket has not been connected.  The
       system  ran  out	 of memory for an internal data structure.  An attempt
       was made to create a socket with a network address for which no network
       interface exists.

       Functions: send(2), recv(2)

       Files: netintro(7), inet(7), ip(7)

       RFC 792, Internet Control Message Protocol

       RFC  2463,  Internet Control Message Protocol (ICMPv6) for the Internet
       Protocol Version 6 (IPv6)


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