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PA2AGA > TCPDIG 04.12.96 05:37l 173 Lines 6421 Bytes #-10800 (0) @ EU
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Message-Id: <tcp_96_255>
From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 96/255
X-BBS-Msg-Type: B
TCP-Group Digest Mon, 2 Dec 96 Volume 96 : Issue 255
Today's Topics:
IP v 6 (3 msgs)
IPv6 and MTU for 1200
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----------------------------------------------------------------------
Date: Sun, 1 Dec 1996 08:07:47 -0600
From: "Steve Sampson" <ssampson@oklahoma.net>
Subject: IP v 6
Dennis Rosenauer <rosenave@octoblob.rfnet.sfu.ca> says:
> I think this MTU discussion is kind of pointless. You just run what
> makes sense for the local RF network in question.
Wow, that's pretty technical. Can we quote you?
Steve
------------------------------
Date: Sun, 1 Dec 1996 17:02:32 GMT
From: brian@nothing.UCSD.EDU (Brian Kantor)
Subject: IP v 6
>Isn't 256 the maximum packet length for the standard ax25 ??
Yes, officially. We've been ignoring that restriction for years.
- Brian
------------------------------
Date: Mon, 02 Dec 1996 00:04:19 -0500
From: "Fred R. Goldstein" <fgoldstein@bbn.com>
Subject: IPv6
At 09:03 PM 11/30/96 GMT, Brian Kantor wrote:
>Since Fred is far from being a Luddite, I'd be interested in more
>discussion of v4 vs v6 and why we might NOT want to change over
>from him and from others.
The race for bigger address space comes about because of the growth in
TCP/IP usage, which really is spectacular. But we're no longer seeing
addresses being assigned as rapidly as TCP/IP stations come onto the net.
There are two large groups of new TCP/IP users. One is corporate
intranets", using TCP/IP where in the past they might have used DECnet, SNA
or IPX. These often use the private address space, like Net 10. This has
security benefits, making the networks less reachable from undesirables
outside the perimeter. Firewalls implement Network Address Translation or
application relaying, so there is still public connectivity; the firewall in
turn owns a small window of addresses used for these features, shared by the
whole intranet.
The other large group is The Great Unwashed, public dial-in ISP subscribers.
These as a general rule use dynamic IP, addresses leased for the term of the
phone call. Since only 2-5% of ISP retail users are usually on line at
once, even given a required "quiet" time after the call, there are many more
potential users (subscribers) than addresses required (active lines).
Dynamic addresses are issued over LANs using DHCP, and over dial-up using
IPCP. Our old static host addresses, familiar on AMPRnet, are a luxury.
Static still has its role for servers, etc., and for non-broadcast multiple
access media, and other special cases like radio. But there is less
pressure on the address space than before. IPv4 can keep going for years to
come.
And given the free market ("cheap") nature of the Internet, who's to say
that anyone will pay for a transition that isn't really necessary?
---
Fred R. Goldstein k1io fgoldstein@bbn.com +1 617 873 3850
Opinions are mine alone. Sharing requires permission.
------------------------------
Date: Sun, 1 Dec 96 15:56:47 DST
From: "Demetre Ch. Valaris" <sv1uy@nest.sv1uy.ampr.org>
Subject: IPv6 and MTU for 1200
Dear friends,
I have been following the discussion about IPv6 and I saw that someone said
that you only use 256 bytes MTU on 1200 bps links.
Well here in Athens we have been using an MTU of 576 on 1200 bps RF links
over the last 5 years with very few problems!!! When one station has a
problematic RF link, we urge him to have an MTYU of 256 and again this solves
the problem. Everyone else uses 576 and is fully compatible with him (on IPv4
of course).
Again on 9600 bps we use 576 and all seems to work fine here in Athens!!!
I am reading all the discussion about IPv6 with great interest!!!
73 from Demetre - SV1UY - IP coordinator of AMPRnet in Greece
+-----------------------------------------------------------------------------
+
| Demetre Ch. Valaris - SV1UY ///// //// //// / ////
|
| e-mail (home) : sv1uy@sv1uy.ampr.org / / //// / ////
|
| e-mail (work) : sv1uy@natbank.ath.forthnet.gr / //// / / /
|
| AX25 packet : SV1UY@SV1AAW.ATH.GRC.EURO
|
+-----------------------------------------------------------------------------
+
| Recyclable bits and bytes have been used for the message above.
|
+-----------------------------------------------------------------------------
+
------------------------------
Date: Sun, 1 Dec 1996 01:55:20 -0800 (PST)
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------------------------------
End of TCP-Group Digest V96 #255
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