X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=rescue%2Fvirt-rescue.pod;h=415bcda9a39c24f256885e1e11b3b8fc7b9fef65;hb=75893a554c374f59318844bca3433e6a2d6c774b;hp=0c24471767260b2ec09327577040428a318c8075;hpb=c5747bd43637efb81485866e1fade3bb55f6d726;p=libguestfs.git

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