Date: Wed, 22 Sep 93 04:30:08 PDT
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
Precedence: Bulk
Subject: TCP-Group Digest V93 #245
To: tcp-group-digest
TCP-Group Digest Wed, 22 Sep 93 Volume 93 : Issue 245
Today's Topics:
KA9Q base code and scrollback
SunOS 4.X AX25 kernel driver
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Date: Wed, 22 Sep 93 07:31:45 UTC
From: wj8q@wsu.n8fow.ampr.org
Subject: KA9Q base code and scrollback
To: tcp-group@ucsd.edu
Hiya..
Just a note- I'm the one that had the problem. I have since figured out
what it was. I'm not sure if it was intended to work this way or not, but
what happens is that it won't open the TMP files into any TMP environment
setting set to a root directory of a drive. I had my TMP environment
set to a ramdrive, d:\, and it wouldn't do any temp file opening.
Same on testing using main drives, etc-But I kept setting to root and
it didn't help--
Once I made a directory in the ramdrive + set my TMP environment to that
drive+directory, no problem.
Thought I'd let y'all know.
73's,
Wes
_______
SMTP/Internet: wj8q@hamgate.cc.wayne.edu
LAN: wj8q@wsu.n8fow.ampr.org
: Wj8q@wj8q.ampr.org : 44.102.40.18
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Date: Wed, 22 Sep 1993 01:02:01 -0700 (PDT)
From: William.Dorsey@Corp.Sun.COM (Bill Dorsey)
Subject: SunOS 4.X AX25 kernel driver
To: tcp-group@ucsd.edu
Hi,
Earlier, I asked a question about setting netmasks and broadcast addresses,
and setting up routing on a Sparcstation running SunOS 4.X and the AX25
kernel driver in the /hamradio/packet/sun directory on ucsd.edu. I was
able to establish outgoing connections from my machine to other hosts on
amprnet, but they were not able to establish connections with me. I was
led to believe this was because I didn't have routing set up correctly,
or perhaps because I was using the wrong netmasks.
After having spent many hours pulling my hair out trying to figure out
what was going on, I finally bit the bullet and began sprinkling some
printf's in the AX25 driver to see what was going on. After a few more
hours of debugging, I realized that incoming ARP requests weren't being
answered. As you can see below from the context diffs between the orig-
inal tty_ax.c and my tty_ax.c, this is because the network interface
ethernet address was being compared against the ax25 broadcast address
in code which determines whether or not a packet is destined for our
host. This is incorrect, and should be a comparison between the incoming
ethernet address and the ethernet broadcast address.
The original code would never pass ARP requests (which have their ethernet
destinations set to be the ethernet broadcast address) to our host to the
kernel, and thus the kernel would never generate an ARP reply. This
prevents other stations from establishing a connection to the Sun, and
thus severely limits the utility of the driver.
I hope this is useful to someone... The full source code to the driver is
available for anonymous ftp from n3lmf.ampr.org. The connection is very
slow and the w6yx gateway seems to be down a lot, so if there is much
demand, I can put it on ucsd.edu.
*** tty_ax.c.old Fri Sep 3 14:24:18 1993
--- tty_ax.c Tue Sep 21 19:46:30 1993
***************
*** 472,478 ****
ax_ax2ether(ax->ah_dst, &oureth);
if( bcmp((caddr_t)&oureth, (caddr_t)&axp->arpcom.ac_enaddr,
sizeof oureth) &&
! bcmp((caddr_t)ax25broadcastaddr, (caddr_t)&a->arpcom.ac_enaddr,
sizeof oureth)) {
*forusp = 0;
}
--- 472,478 ----
ax_ax2ether(ax->ah_dst, &oureth);
if( bcmp((caddr_t)&oureth, (caddr_t)&axp->arpcom.ac_enadd
sizeof oureth) &&
! bcmp((caddr_t)&oureth, (caddr_t)ðerbroadcastaddr,
sizeof oureth)) {
*forusp = 0;
}
--
Bill Dorsey william.dorsey@corp.sun.com
PGP 2.X public key n3lmf@n0ary.#norcal.ca.us.na
available on request dorsey@n3lmf.ampr.org
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End of TCP-Group Digest V93 #245
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