Ref: 99980054
Title: Questions & Answers TCP/IP
Date: 10/1/85

Copyright 3Com Corporation, 1991.  All rights reserved.

Since the release of the TCP/IP products, several questions
about TCP/IP have been raised.  In this issue, Bridge published
the most commonly asked questions and provided the answers.

Q:  How can I find the internet address of my host (running 4.2
BSD UNIX)?

A:  The host internet address can usually be found in the
"hosts"* file.  This file is located under the "etc"
directory.


Q:  Does the Show NetMap command display the internet addresses
of the hosts and workstations as well as the internet
addresses of the Bridge Communications Servers.

A:  No, the Show NetMap command only displays the internet
addresses of the Bridge Communications Servers.


Q:  How can I determine whether the internet addresses are class
A, class B, or class C?

A:  The value of the first subfield defines the format of the
internet address.  Class A, class B, and class C internet
addresses are ranged as follows:

         Class              Range          Format

           A                 0 - 127      nnn.hhh.hhh.hhh
           B               128 - 191      nnn.nnn.hhh.hhh
           C               192 - 223      nnn.nnn.nnn.hhh

    In the format column, n represents digits of the network
    number, and h represents digits of the host number.


Q:  When a connection is made to the host via the Communications
Servers with TCP/IP, a character is missing on every 1024
characters.  It is a Bridge TCP software problem?

A:  No.  This problem is a bug in Berkeley's Telnet and it only
occurs when the sending process sends exactly 1024 bytes.  In
order to solve this problem, perform the following patach in
the "telnetd.c" file for 4.3 BSD UNIX (the "telnetd.c"* file
is usually located under the "/usr/src/etc" directory):

    Change line 259:

    from - if (nfrontp - nbackp)
    to   - if (nfrontp - nbackp||ppc > 0)

    Change line 263:

    from - if (pfrontp - pbackp)
    to   - if (pfrontp - pbackp||ncc > 0)

    Recompile the "telnetd.c" file to create an executable file.
-----------------
*  If the host and telnetd.c files are not found under the
directories mentioned above, consult your system
administrator.
