a ADSL or SCO Development System problem ?

From: Helio Cardoso (denovo_at_bignet.com.br)
Date: 11/21/04 

Date: 21 Nov 2004 00:51:37 -0800

Hi,

Scenario
========

I have a small ethernet network with a few W95/W98 machines, 2 ADSL routers
and a rock solid Openserver 5.04. ADSL routers are NAT enabled, one for
Openserver and other for W95/W98.

I have a small program called "nettalk" compiled and running on the Openserver.
It is a simple program (less than 100 lines of C source code) that reads stdin
sending it to any remote IP/TCP port (just like netcat) and writes remote IP
responses to stdout.

Problem
=======

Last week, "nettalk" stopped working. I did "ping" to some known hosts and
they were ok. I did a test using telnet:

     telnet www.google.com 80
     GET / HTTP/1.0 [enter]
     <empty line> [enter]
     <http server responses> .......
     
Telnet worked, but "nettalk" didnīt. When I changed Openserverīs gateway to
ADSL router #2, it began to work. For now on, "nettalk" doesnīt work on
ADSL router #1.

Why telnet works on both ADSL routers and "nettalk" donīt ??

It seens that telnet is using a different library to access network
system calls.

This could be a SCO Development System problem or just an ADSL issue ?