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To: Carlos Antonio Ruggiero <TOTO@ifqsc.sc.usp.br>
cc: freebsd-hackers@freebsd.org
Subject: Re: Slip hangs my machine :-( 
In-reply-to: Your message of "Fri, 02 Jun 95 15:46:00 +0700."
             <EB77704EB17F001AA6@IFQSC.SC.USP.BR> 
Date: Fri, 02 Jun 1995 11:57:27 -0700
From: "Justin T. Gibbs" <gibbs@freefall.cdrom.com>
Sender: hackers-owner@freebsd.org
Precedence: bulk

>Hi everybody,
>
>I'm having trouble with my slip connection. I waited for 2.0.5
>to see if the problem went away but it is still there...
>
>I have a leased line to my university ( a cisco router) and a
>US Robotics V.FC 28.800 on each side of the connection. The cisco
>router is rather old and only supports slip (no VJ compression)
>
>I've been using this setup since september 1993 (the modem was 14400) 
>with no problems whatsoever. However, since one of the latest
>snaps (the march one I think) the slip connection hangs 
>the machine after 1 or 2 megabytes of transfers. When I say
>"hangs" I mean it! No activity, no ALT-FN, nada. Only the big
>red button...
>
>I'm sure it's not a hardware problem because DOS, OS/2 (aaarrrgh)
>and linux seem to be very happy with it. I've been transferring
>hundreds of megabytes using linux with no problems.
>
>I believe it's got to do with some configuration thing but I am
>really not sure. What I do is:
>slattach -s 38400 -h /dev/cuaa1
>ifconfig sl0 143.107.228.51 143.107.228.4
>route add default 143.107.228.4
>
>And that is all. It works for a while and ... freezes... Do
>I have to set cuaa1 to some state? Any other parameter to slattach?
>
>Please help!! It is funny that I have to use linux when FreeBSD
>was so nice in this respect when linux was quite shaky, two years
>ago...
>
>Ahh, FreeBSD 2.0 Release seems to be fine but I need the
>2940 device driver to use my 2.1G disk and my Exabyte tape :-)
>
>Thanks
>
>Carlos Ruggiero (toto@ifq.sc.usp.br)

In /etc/sysconfig, set:

#
# Some broken implementations can't handle the RFC 1323 and RFC 1644
# TCP options.  If TCP connections randomly hang, try disabling this,
# and bug the vendor of the losing equipment.
#
tcp_extensions=NO

--
Justin T. Gibbs
==============================================
TCS Instructional Group - Programmer/Analyst 1
  Cory | Po | Danube | Volga | Parker | Torus
==============================================