From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Fri, 30 May 2003 15:59:57 +0000 (+0000)
Subject: A bit of networking notworking negativity.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=7137b697ec555c9b289c3e73574e70805cde732d;p=p5sagit%2Fp5-mst-13.2.git

A bit of networking notworking negativity.
(Inspiration from Jos.)

p4raw-id: //depot/perl@19641
---

diff --git a/pod/perlport.pod b/pod/perlport.pod
index cdf30ab..45deaac 100644
--- a/pod/perlport.pod
+++ b/pod/perlport.pod
@@ -487,6 +487,20 @@ To convert $Config{perlpath} to a file pathname, say:
   if ($^O ne 'VMS')
      {$thisperl .= $Config{_exe} unless $thisperl =~ m/$Config{_exe}$/i;}
 
+=head2 Networking
+
+Don't assume that you can reach the public Internet.
+
+Don't assume that there is only one way to get through firewalls
+to the public Internet.
+
+Don't assume that you can reach yourself or any node by the name
+'localhost'.  The same goes for '127.0.0.1'.
+
+Don't assume that any particular port (service) will respond.
+
+Don't assume that you can ping hosts and get replies.
+
 =head2 Interprocess Communication (IPC)
 
 In general, don't directly access the system in code meant to be