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.TH TSBRIDGE 8C "08 March 1989"
.\" $Header: /f/osi/others/tsbridge/RCS/tsbridge.8c,v 7.2 89/12/08 09:41:19 mrose Exp $
.\"
.\" Contributed by Julian Onions, Nottingham University in the UK.
.\"
.\"
.\" $Log:	tsbridge.8c,v $
.\" Revision 7.2  89/12/08  09:41:19  mrose
.\" touch-up
.\" 
.\" Revision 7.1  89/11/27  05:43:27  mrose
.\" sync
.\" 
.\" Revision 7.0  89/11/23  22:11:11  mrose
.\" Release 6.0
.\" 
.SH NAME
tsbridge \- Transport Service Bridge
.SH SYNOPSIS
.in +.5i
.ti -.5i
.B \*(SDtsbridge
\%[-a\ address]
\%[-s]
\%[-T\ tailorfile]
\%[configuration-file\ ...]
.in -.5i
(under /etc/rc.local)
.SH DESCRIPTION
The \fItsbridge\fP listens for transport connections on the
given address.  Once a connection is accepted the transport selector
is examined for a transport address and a call initiated to that
address.
The TSB then shuffles data back and forth between the two connections.
This is used to solve interworking problems between OSI hosts/networks
using different lower-layer stacks (e.g., TP0/X.25, TP4/CLNP,
RFC1006/TCP, and so on).
.PP
Entries are seperated by end\-of\-line (or the end\-of\-file).
The character `#' at the beginning of a line indicates a comment line.
The syntax is:
.sp
.in +.5i
.nf
address [forwarding-address] [-s]
.fi
.in -.5i
.sp
as in
.sp
.in +.5i
.nf
# generic tsb operation
Internet=sheriff+19001\\|Janet=000021000018+PID+04010100

# specific use of transparent address with strict checking
Internet=sheriff+19002 Internet=sheriff+102 -s
.fi
.in -.5i
.PP
If the forwarding address is present, this specifies that the
\fItsbridge\fP should run in transparent mode. That is, it should
accept incoming connections as though it were the \fItsapd\fP daemon
and a call established to the given address (which is normally a
\fItsapd\fP process or a static listener). 
.PP
The `\-s' option specifies strict transport addresses. When relaying
through the \fItsbridge\fP the calling transport address is changed to
indicate that of the \fItsbridge\fP. This can fail in several ways:
.TP
1.
The original calling address when encoded into a string may be too big
to fit into the transport selector.
.TP 
2.
The \fItsbridge\fP may not be listening on an address on the outgoing
network. (E.g., it can call out on that network but not accept
incoming calls.)
.TP
3.
The original calling address can not be converted to a text string (unusual).
.PP
In strict mode, this failure will abort the connection attempt. If
strict mode is not in force, then the bridge will leave the original
transport address alone and hope it is not needed.
.PP
If desired, the \fItsbridge\fP can run without a configuration file,
in which case the `\-a' flag specifies the address to listen on. If
this is not present, it will use use the value of the
\*(lqtsb_default_address\*(rq variable in the tailor file for the
default address.
The `\-s' flag may also be specified in this case.
.PP
Finally the `\-T' flag specifies a different \fIisotailor\fR file to use.
This should be a full pathname and, if present,
should be the first argument given.
.SH FILES
.nf
.ta \w'\*(EDisotailor  'u
\*(EDisotailor	ISODE tailoring file
.re
.fi
.SH "SEE ALSO"
\fIThe ISO Development Environment: User's Manual, Volume 2:
Underyling Services\fR, \*(lqThe Transport Switch\*(rq.
.br
isotailor(5),
tsapd(8)
.SH AUTHORS
Julian Onions,
Nottingham University.
.br
Based on an idea by Steve Kille of University College London
and Christian Huitema of INRIA.