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From: tucker@ccvaxa.UUCP
Newsgroups: net.lan
Subject: Re: License violation detection
Message-ID: <7300006@ccvaxa>
Date: Sun, 23-Mar-86 20:33:00 EST
Article-I.D.: ccvaxa.7300006
Posted: Sun Mar 23 20:33:00 1986
Date-Received: Sun, 20-Apr-86 11:10:23 EST
References: <141@suneast.uucp>
Lines: 16
Nf-ID: #R:suneast.uucp:141:ccvaxa:7300006:000:699
Nf-From: ccvaxa.UUCP!tucker    Mar 23 19:33:00 1986


> Any 4.2 system should have this in /etc/services ....

Just because a service is listed in /etc/services doesn't mean a hill
of beans.  /etc/services is just there to aid a user program in finding
its service port number symbolicly.  Those services like discard, echo,
ascii, date and etc will get ICMP messages unless the 4.2 host has a
user program bound to that port.  Most systems don't.  Such user 
programs are not distributed with 4.X BSD, and 4.X doesn't intercept
these in the kernel even though it would be easy to do it.  The bottom
line is yes you will get lots of ICMP messages if you try this.

Note: I assume you mean the UDP/TCP reserved services and not the ICMP
      ones.

tim