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PA2AGA > TCPDIG 12.01.97 04:04l 214 Lines 6608 Bytes #-10761 (0) @ EU
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From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 96/260A
X-BBS-Msg-Type: B
TCP-Group Digest Sun, 22 Dec 96 Volume 96 : Issue 260
Today's Topics:
Finding aol.com IP Address (4 msgs)
NRZI encoder
Success: Finding aol.com IP Address (3 msgs)
TCP-Group Digest V96 #259
Send Replies or notes for publication to: <TCP-Group@UCSD.Edu>.
Subscription requests to <TCP-Group-REQUEST@UCSD.Edu>.
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the TCP-Group Digest are available
(by FTP only) from ftp.UCSD.Edu in directory "mailarchives".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Sat, 21 Dec 1996 15:35:38 +0100 (MET)
From: Magne Mahre <magne@radar.no>
Subject: Finding aol.com IP Address
On Sat, 21 Dec 1996, Bill Bytheway wrote:
> I can't seem to find an IP address for aol.com that will
> accept SMTP mail. Anyone have a good address.
>
> I tried an assortment of different Domain Name Servers
> and they all reply "Unknown host aol.com"
>
> I tried calling aol.com's tech line, and they said that
> they couldn't give me the address, it was proprietatary.
Huh?????
First, there is no host called aol.com - it's a domain.
The domain has several mail exchangers defined. These are
[a,b].mr.aol.com and [c,d,e,f,g,h,i].mx.aol.com.
The MX's are again aliases for other hosts:
example:
| a.mr.aol.com is a nickname for mrin04.mx.aol.com
| mrin04.mx.aol.com has address 198.81.11.106
Dunno what you need this IP-address for, but there you go...
The others can be found by querying the DNS..B
--Magne / la1bfa
------------------------------
Date: Sat, 21 Dec 1996 08:49:11 -0500
From: Bill Edwards <bedwards@trytel.com>
Subject: Finding aol.com IP Address
Bill,
Just tried from here. Nslookup returns the addresses of 8 MX (Mail
Exchanger) servers at aol called f.mx.aol.com or g.mx.aol.com. I
suspect with something as big as aol there are lots of smtp servers. To
get nslookup to do this, just [SET type=MX] at the nslookup prompt and
type aol.com.
If this comes back to you then your smtp server should be able to find
the server address that goes with the aol address you are trying to
reach. If it doesnt work then the dns server you are using is broken,
but you still should be able to send the message through a "smart
mailhost" further up the line.
Hope this helps,
Bill, VE3WCE
------------------------------
Date: Sat, 21 Dec 1996 10:13:56 -0600 (CST)
From: System Administrator <root@disco.okc.oklahoma.net>
Subject: Finding aol.com IP Address
>
> I can't seem to find an IP address for aol.com that will
> accept SMTP mail. Anyone have a good address.
They expect you to use a mailer capable of resolving an
MX record. If you are using xNOS, then make sure you have
smtp usemx on turned on.
To answer your real question, do this on a Unix machine:
nslookup
set type=mx
aol.com
After doing this, you will see that they have "several"
mail machines. As an administrator I wouldn't want you
picking just one, as it may fail. Usually you share the
load (especially when you're as big as AOL).
> I tried calling aol.com's tech line, and they said that
> they couldn't give me the address, it was proprietatary.
>
Thus, while the tech line used the word "propietary", they
really mean't "don't do it manually sir."
>
> I tried an assortment of different Domain Name Servers
> and they all reply "Unknown host aol.com"
Try this on a Unix machine:
nslookup
set type=soa
aol.com
That will give you what you are looking for. You are
correct that there is no machine called aol.com, but that
doesn't really matter.
--
Steve, n5owk
------------------------------
Date: Sat, 21 Dec 96 19:19:00 -0000
From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow)
Subject: Finding aol.com IP Address
Bill Bytheway wrote in a message to Mike Bilow:
BB> I can't seem to find an IP address for aol.com that will
BB> accept SMTP mail. Anyone have a good address.
BB> I tried an assortment of different Domain Name Servers
BB> and they all reply "Unknown host aol.com"
Try querying for an MX:
nslookup -query=mx aol.com
What is it exactly that you are trying to do?
BB> I tried calling aol.com's tech line, and they said that
BB> they couldn't give me the address, it was proprietatary.
That's pretty funny! Maybe they were trying to get rid of you.
-- Mike
------------------------------
Date: Sat, 21 Dec 1996 15:11:08 -0800 (PST)
From: Dennis Rosenauer <rosenave@octoblob.rfnet.sfu.ca>
Subject: NRZI encoder
I have a "dumb" question. Does anyone out there know of a simple
circuit to implement an NRZ -> NRZI encoder? I am pretty sure all
it takes is a D flip-flop and an XOR, but the egg-nog is fogging
my brain too much to work the fool thing out :-).
Dennis.
--
Dennis Rosenauer VE7BPE | A computer running for 2 seconds
rosenave@octoblob.rfnet.sfu.ca | can make as many mistakes as 20
| men working for 20 years.
------------------------------
Date: Sat, 21 Dec 96 10:42:59 UTC
From: bytheway@aa6ed.ampr.org (Bill Bytheway)
Subject: Success: Finding aol.com IP Address
Many thanks to the following individuals for their quick response:
Bill Edwards <bedwards@trytel.com>
Magne Mahre <magne@radar.no>
Brian Mullaney <mullaneb@mccc.edu>
I'm sure that there will also be other responses, and thanks to
you as well. For those of you wondering why I needed aol.com's
address, the answer is simple. I'm running JNOS 1.13 TCP/IP
amateur radio software with two local radio ports. The local
DNS could not resolve address '@aol.com' and was not accepting
SMTP mail. Attempts to resolve aol.com using my ISP failed, and
I didn't have access to nslookup. I see now how it works.
The new IP addresses have been added to my local DNS and
To be continued in digest: tcp_96_260B
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