1.1 --- a/docs/src/user.tex	Wed Nov 10 13:21:16 2004 +0000
     1.2 +++ b/docs/src/user.tex	Wed Nov 10 13:30:12 2004 +0000
     1.3 @@ -1399,6 +1399,23 @@ special configuration.
     1.4  The purpose of this section is to describe the mechanisms provided by
     1.5  \xend to allow a flexible configuration for Xen's virtual networking.
     1.6  
     1.7 +\subsection{Xen virtual network topology}
     1.8 +
     1.9 +Each domain network interface is connected to a virtual network
    1.10 +interface in dom0 by a point to point link (effectively a `virtual
    1.11 +crossover cable').  These devices are named {\tt
    1.12 +vif$<$domid$>$.$<$vifid$>$} (e.g. {\tt vif1.0} for the first interface
    1.13 +in domain 1, {\tt vif3.1} for the second interface in domain 3).
    1.14 +
    1.15 +Traffic on these virtual interfaces is handled in domain 0 using
    1.16 +standard Linux mechanisms for bridging, routing, rate limiting, etc.
    1.17 +Xend calls on two shell scripts to perform initial configuration of
    1.18 +the network and configuration of new virtual interfaces.  By default,
    1.19 +these scripts configure a single bridge for all the virtual
    1.20 +interfaces.  Arbitrary routing / bridging configurations can be
    1.21 +configured by customising the scripts, as described in the following
    1.22 +section.
    1.23 +
    1.24  \subsection{Xen networking scripts}
    1.25  
    1.26  Xen's virtual networking is configured by two shell scripts (by
    1.27 @@ -1428,6 +1445,9 @@ VIFs on the default Xen bridge.
    1.28  
    1.29  \end{description} 
    1.30  
    1.31 +For more complex network setups (e.g. where routing is required or
    1.32 +integrate with existing bridges) these scripts may be replaced with
    1.33 +customised variants for your site's preferred configuration.
    1.34  
    1.35  %% There are two possible types of privileges:  IO privileges and
    1.36  %% administration privileges.