Undeliverable Mail

FRI 23 SEP 1988 13:20:21 CDT

The following errors occurred while attempting to send this mail file.

Best guess - SENDER is: TCP-IP @SRI-NIC.ARPA

*13.20.18 FROM: Invalid user/address string

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Date: Thu, 15 Sep 88 17:37:25 GMT
Sender: "(TCP-IP ARPA Discussions)" <Sender: "(TCP-IP ARPA Discussions)" <TCPIP-L@BYUADMIN>
Comments: Warning -- original Sender: tag was tcp-ip-request@SRI-NIC.ARPA
From: Karl Kleinpaste
Subject: Re: ICMP's & IP src addrs
X-To: tcp-ip@sri-nic.arpa
To: jeff consoer <To: jeff consoer <CC57000@SDSUMUS>

As long as I was at it, I decided to look at what a large collection
of diverse machines did with pings to .255. I hit our backbone
ethernet (128.146.8, a little over 100 hosts) with a ping like this,
and the results are:

Responding with
Sun-3/180 (SunOS 3.5.1 [UNIX]).

Responding with their own addresses:
HP-9000 (HP-UX [UNIX]), IBM-RT/PC (Mach), Proteon P4200, BBN Butterfly
(Mach), Pyramid (OSx 4.x [UNIX]), Encore Annex telnet server.

Not responding:
DEC-2060 (TOPS 6.1; responds to direct ping), AT&T 3B2/400 (SysV
Rel3.0 + TWG WIN; responds to direct ping), Kinetics Mac gateways
(KIP; doesn't respond to direct ping), Encore Multimax (Umax 4.2;
responds to direct ping), TI Explorer (Zetalisp; responds to direct
ping), Xerox-1108 (Interlisp; responds to direct ping).

Also, we have one HP-9000 client subnet. When pinging that subnet's
broadcast addr (, *only the server* responded - the
rest were silent. Weird.


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