Date: Tue, 12 Mar 1996 09:30:34 +0200 (SAT) From: R Bezuidenhout <rbezuide@mikom.csir.co.za> To: hackers@freebsd.org Subject: UP/DOWN ?bug? with slattach Message-ID: <199603120730.JAA07648@zibbi.mikom.csir.co.za>
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Hi all
I have experienced the following problem with slattach on a system
running FreeBSD 2.1-STABLE with a multiport io card.
Setup
>more /etc/start_if.sl0
slattach -a -h -s 9600 /dev/aso01
in sysconfig
ifconfig_sl0="inet 146.64.54.9 146.64.54.10 netmask 255.255.255.252"
The same on another FreeBSD 2.1-STABLE machine with the appropriate
ifconfig.
Symptoms:
If both the routers boot at the same time, the link UPs and I can
ping between the two machines. If I now disconnects the table at
the back (break the link) the devices DOWN ... everything is fine
up to now.
I then reconnect the cables and the devices UP, but down if I ping
I get a "Network is down" response and with a 'netstat -i' I see
that there are no packets going out the interface.
If I reboot one of the machines it sends the packets but the other
side can't reply.
I've played around and found that adding -l to slattach prevents
the device from going DOWN and thus in a way solves the problem,
but now it would be impossible to notice that the line has gone
down.
After reading the man page carefully I tried to add a
-r '/mydir/dummy.redial'
to slattach and removing the -l. The dummy.redial script does
an echo and that is all. Everything them works fine when I
disconnect the cables (device DOWNs) and reconnects and then
I can ping again.
I had a look at the source code of slattach as I don't see that
it is necessary to have a -r option to get it to wotk with modem
control set to on.
I made apatch that solved my problem and I have tested a few senarios
and to date nothing broke :), but I am not sure. So .. if anyone
can have a look at the patch and see if it is all right I would
appreciate it. It seems that a call to acquire_line() was forgotten.
Thanx
Reinier
Summary:
If slip device DOWN/UP with no -l or -r option set in slattach
a "Network is down" error occurs.
Patch:
*** /usr/src/sbin/slattach/slattach.c Thu Oct 26 08:44:37 1995
--- slattach.c Mon Mar 11 16:28:12 1996
***************
*** 497,502 ****
--- 497,503 ----
syslog(LOG_NOTICE, "SIGHUP on %s (sl%d); exiting", dev, unit);
exit_handler(0);
#endif
+ acquire_line();
if (ioctl(fd, TIOCSETD, &ttydisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
exit_handler(1);
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