File 0018-rescue-Add-notes-about-networking.patch of Package libguestfs

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File 0018-rescue-Add-notes-about-networking.patch of Package libguestfs

From f00ed685207d0f8807de0ec90c86d8f60aec217f Mon Sep 17 00:00:00 2001
From: Richard W.M. Jones <rjones@redhat.com>
Date: Wed, 8 Dec 2010 12:12:08 +0000
Subject: [PATCH 18/72] rescue: Add notes about networking.

In particular the 'ping' command does not work because it is
using QEMU user networking.
(cherry picked from commit f3805e2166e2ab54cd9a6e8b7c536e6f20a61dff)
---
 rescue/virt-rescue.pod |   38 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 37 insertions(+), 1 deletions(-)

diff --git a/rescue/virt-rescue.pod b/rescue/virt-rescue.pod
index 0c24471..415bcda 100755
--- a/rescue/virt-rescue.pod
+++ b/rescue/virt-rescue.pod
@@ -155,7 +155,7 @@ parameter is specified in megabytes.
 
 =item B<--network>
 
-Enable QEMU user networking in the guest.
+Enable QEMU user networking in the guest.  See L</NETWORK>.
 
 =item B<-r>
 
@@ -206,6 +206,42 @@ name as a guest.
 
 For compatibility the old style is still supported.
 
+=head1 NETWORK
+
+Adding the I<--network> option enables QEMU user networking
+in the rescue appliance.  There are some differences between
+user networking and ordinary networking:
+
+=over 4
+
+=item ping does not work
+
+Because the ICMP ECHO_REQUEST protocol generally requires root in
+order to send the ping packets, and because virt-rescue must be able
+to run as non-root, QEMU user networking is not able to emulate the
+L<ping(8)> command.  The ping command will appear to resolve addresses
+but will not be able to send or receive any packets.  This does not
+mean that the network is not working.
+
+=item cannot receive connections
+
+QEMU user networking cannot receive incoming connections.
+
+=item making TCP connections
+
+The virt-rescue appliance needs to be small and so does not include
+many network tools.  In particular there is no L<telnet(1)> command.
+You can make TCP connections from the shell using the magical
+C</dev/tcp/E<lt>hostnameE<gt>/E<lt>portE<gt>> syntax:
+
+ exec 3<>/dev/tcp/redhat.com/80
+ echo "GET /" >&3
+ cat <&3
+
+See L<bash(1)> for more details.
+
+=back
+
 =head1 ENVIRONMENT VARIABLES
 
 Several environment variables affect virt-rescue.  See
-- 
1.7.1

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File 0018-rescue-Add-notes-about-networking.patch of Package libguestfs

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