Path: utzoo!mnetor!uunet!husc6!uwvax!dogie!uwmcsd1!ig!agate!ucbvax!BRL.ARPA!phil
From: phil@BRL.ARPA (Phil Dykstra)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Ping, checksum algorithm?
Message-ID: <8803211804.aa03395@SPARK.BRL.ARPA>
Date: 21 Mar 88 23:04:22 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 23

Ping.c as found in Berkeley Unix was originally written by
Mike Muuss at the U.S.Army Ballistic Research Laboratory
<mike@brl.arpa>.  It is public domain distribution unlimited.
Berkeley made some modifications to it but maintained its
public domain status.

Recently we at BRL modified it to do RECORD_ROUTE, provide
more detailed ICMP messages (read subcodes), dump the fields
of returned IP headers in ICMP messages, etc.  Our version
does not yet do LSRR or SSRR (though since I heard that the
core gateways honor it, it will almost certainly be added).
[Note: record route can not be done on a SunOS <= 3.4 since
the IP_OPTIONS socket option does not exist - the rest of
the code works fine on the Sun however.]

Anticipating a possible high demand, I have made the source
code publicly FTP'able from VGR.BRL.MIL [192.5.23.5 or
128.63.4.4] in pub/ping.tar.  Man page included.

- Phil
<phil@brl.arpa>

ps: warning - our main gateway was having hardware problems today.