The following are tips for getting the host to connect over the modem to another computer. This is appropriate for establishing a terminal session with a remote host.
This kind of connection can be helpful to get a file on the Internet if there are problems using PPP. If PPP is not working, use the terminal session to FTP the needed file. Then use zmodem to transfer it to the machine.
A generic Hayes dialer is built into
tip
. Use at=hayes
in
/etc/remote
.
The Hayes driver is not smart enough to recognize some of
the advanced features of newer modems messages like
BUSY
, NO DIALTONE
, or
CONNECT 115200
. Turn those messages off
when using tip
with
ATX0&W
.
The dial timeout for tip
is 60
seconds. The modem should use something less, or else
tip
will think there is a communication
problem. Try ATS7=45&W
.
Create a “direct” entry in
/etc/remote
. For example, if the modem
is hooked up to the first serial port,
/dev/cuau0
, use the following
line:
cuau0:dv=/dev/cuau0:br#19200:pa=none
Use the highest bps rate the modem
supports in the br
capability. Then, type
tip cuau0
to connect to the modem.
Or, use cu
as root
with the following
command:
#
cu -l
line
-sspeed
line
is the serial port, such
as /dev/cuau0
, and
speed
is the speed, such as
57600
. When finished entering the AT
commands, type ~.
to exit.
The @
sign in the phone number
capability tells tip
to look in
/etc/phones
for a phone number. But, the
@
sign is also a special character in
capability files like /etc/remote
, so it
needs to be escaped with a backslash:
pn=\@
Put a “generic” entry in
/etc/remote
. For example:
tip115200|Dial any phone number at 115200 bps:\ :dv=/dev/cuau0:br#115200:at=hayes:pa=none:du: tip57600|Dial any phone number at 57600 bps:\ :dv=/dev/cuau0:br#57600:at=hayes:pa=none:du:
This should now work:
#
tip -115200 5551234
Users who prefer cu
over
tip
, can use a generic
cu
entry:
cu115200|Use cu to dial any number at 115200bps:\ :dv=/dev/cuau1:br#57600:at=hayes:pa=none:du:
and type:
#
cu 5551234 -s 115200
Put in an entry for tip1200
or
cu1200
, but go ahead and use whatever
bps rate is appropriate with the
br
capability.
tip
thinks a good default is 1200 bps
which is why it looks for a tip1200
entry.
1200 bps does not have to be used, though.
Rather than waiting until connected and typing
CONNECT
each time, use host
tip
's cm
capability. For example, these entries in
/etc/remote
will let you type
tip pain
or tip muffin
to connect to the hosts pain
or
muffin
, and tip
deep13
to connect to the terminal server.
pain|pain.deep13.com|Forrester's machine:\ :cm=CONNECT pain\n:tc=deep13: muffin|muffin.deep13.com|Frank's machine:\ :cm=CONNECT muffin\n:tc=deep13: deep13:Gizmonics Institute terminal server:\ :dv=/dev/cuau2:br#38400:at=hayes:du:pa=none:pn=5551234:
This is often a problem where a university has several modem lines and several thousand students trying to use them.
Make an entry in /etc/remote
and use
@
for the pn
capability:
big-university:\ :pn=\@:tc=dialout dialout:\ :dv=/dev/cuau3:br#9600:at=courier:du:pa=none:
Then, list the phone numbers in
/etc/phones
:
big-university 5551111 big-university 5551112 big-university 5551113 big-university 5551114
tip
will try each number in the listed
order, then give up. To keep retrying, run
tip
in a while
loop.
Ctrl+P is the default “force” character,
used to tell tip
that the next character is
literal data. The force character can be set to any other
character with the ~s
escape, which means
“set a variable.”
Type
~sforce=
followed by a newline. single-char
single-char
is any single character. If
single-char
is left out, then the
force character is the null character, which is accessed by
typing
Ctrl+2
or Ctrl+Space. A pretty good value for
single-char
is
Shift+Ctrl+6, which is only used on some terminal
servers.
To change the force character, specify the following in
~/.tiprc
:
force=single-char
This happens when
Ctrl+A is pressed, which is tip
's
“raise character”, specially designed for people
with broken caps-lock keys. Use ~s
to set
raisechar
to something reasonable. It can
be set to be the same as the force character, if neither
feature is used.
Here is a sample ~/.tiprc
for
Emacs users who need to type
Ctrl+2 and Ctrl+A:
force=^^ raisechar=^^
The ^^
is
Shift+Ctrl+6.
When talking to another UNIX®-like operating system,
files can be sent and received using ~p
(put) and ~t
(take). These commands run
cat
and echo
on the
remote system to accept and send files. The syntax is:
~p
local-file [remote-file]
~t
remote-file [local-file]
There is no error checking, so another protocol, like zmodem, should probably be used.
All FreeBSD documents are available for download at http://ftp.FreeBSD.org/pub/FreeBSD/doc/
Questions that are not answered by the
documentation may be
sent to <[email protected]>.
Send questions about this document to <[email protected]>.