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PA2AGA > TCPDIG 24.08.96 21:29l 119 Lines 4390 Bytes #-10909 (0) @ EU
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Message-Id: <tcp_96_167>
From: pa2aga
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Subject: TCP-Group Digest 96/167
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TCP-Group Digest Wed, 21 Aug 96 Volume 96 : Issue 167
Today's Topics:
Nice NOS code
PPP/SLIP in connected AX25?
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----------------------------------------------------------------------
Date: Tue, 20 Aug 1996 15:59:04 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: Nice NOS code
>What module or file would people consider "the way to do it"? If there are
>suggestions, I'll follow that person's lead. I'm not so worried about C
>coding style or normal C stuff like x = x + 1 vs x++ but how to talk to NOS
>and get things like:
> - Certain types of packets
At what level? TCP? UDP? Raw IP? If it's TCP or UDP, I'd use the existing
socket interface, which is supposed to follow the BSD interface fairly
closely.
For something that runs directly on IP you can hook directly into the
protocol switch table defined in config.c, but this would be unique to
NOS. So I'd recommend the raw IP socket interface that I tried to
model after the one in BSD. This kind of thing is admittedly
notoriously unportable or at least nonstandard across BSD variants, so
if there's something you need that's not in the existing Raw IP interface,
tell me and I might be able to make it more general.
> - Access to interface statistics.
This is probably too ad-hoc and implementation specific to ever be well
standardized. Just peek at the control blocks directly.
> - Creating, modifying and destroying linked-lists
These are simple enough operations that you can do them yourself any way
you like. Just use the existing heap management functions malloc/calloc/free.
Note there is a separate manager in NOS for the mbuf (message buffers) used
to hold data packets.
Phil
------------------------------
Date: Tue, 20 Aug 1996 15:06:24 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: PPP/SLIP in connected AX25?
Hi. G8GON sent me mail that got me thinking about ways to more easily
support end users who want to run Windows TCP/IP applications like
Netscape over amateur packet radio without requiring a second machine
running NOS or Linux to act as a router and AX.25 end point.
What about plugging a standard Winsock stack that supports PPP or SLIP
(like the one that built into Windows 95) into a conventional (not
KISS) AX25 TNC and connecting it to a suitably configured NOS gateway?
The over-the-air interface would then be PPP or SLIP in connected-mode
AX25 with PID F0. To distinguish this mode from conventional "dumb
terminal" (e.g., BBS) mode, the NOS router could either set aside a
separate AX25 SSID. Or it could get clever and look for the
distinguishing characteristics of a SLIP or PPP frame in the incoming
data, e.g., the leading C0 or 7E flag character. I understand that
some dialup IP routers/terminal servers already do this.
Comments? Thoughts? Has this been done already in some version of NOS?
Phil
------------------------------
End of TCP-Group Digest V96 #167
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