Date: Mon, 3 Apr 1995 11:15:41 EST5EDT From: "Andrew Webster" <awebster@dataradio.com> To: freebsd-questions@FreeBSD.org Subject: Re: SLIP-server + Notes on this Message-ID: <9504031508.AA15329@rf.dataradio.com>
next in thread | raw e-mail | index | archive | help
> Hi,
>
> I have set up a SLIP server and it's running quite well. But I in the
> slip.login script I only execute the ifconfig command. How can I send some
> string to the dialup-terminal. I use Winsock under MS-Windows to call in for
> a SLIP-connection. But what command should i execute to sned a string to the
> Winsock-client. I've tried echo 'line of text' > /dev/ttyd0 but this doesn't
> seem to work.
>
> Help?!
>
>
The bad news is that the tty device has been closed, and attached to the
SLIP driver by the time you want to print something. You can log
information to a file, but not to the screen.
See the sliplogin.c source if you want to make changes.
[Hint to developpers] One useful fix I'd like to see added is the local and
remote IP addresses printed out to the terminal's console before slip
starts.
One VERY imporant thing that I uncovered when using SLIP connections is
this:
- The slip driver will auto-negotiate TCP header compression ON, but
not OFF, thus causing lots of headaches for the unsuspecting user who
is not using header compression, especially AFTER someone else did use
it on the same SLIP interface. (ie: name server lookups work, but
telnet doesn't). The reason of course is that TCP packets don't make
it through the link, but UDP packets do. Do yourself a favor and add
the -LINK0 option to your slip.logout file. As in: ifconfig $1 -LINK0
down.
-----------------------------------------------------------------------
Andrew Webster Network Manager / Special Projects
Dataradio Inc. 200-5500 Royalmount Ave. TEL: +1 514 737 0020
Town of Mount Royal, QC, CANADA H4P 1H7 FAX: +1 514 737 7883
http://www.dataradio.com Email: awebster@dataradio.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9504031508.AA15329>