Few changes to the manpage

vm.8

@@ -43,6 +43,9 @@
 .Cm switch nat
 .Ar name on|off
 .Nm
+.Cm switch address
+.Ar name a.b.c.d/xx|none
+.Nm
 .Cm switch private
 .Ar name on|off
 .Nm
@@ -250,7 +253,7 @@ child dataset created for each one, specify the dataset to use in
 .Pa /etc/rc.conf
 as follows:
 .Bd -literal -offset indent
-$vm_dir="zfs:pool/dataset"
+vm_dir="zfs:pool/dataset"
 .Ed
 .Pp
 In contrast to earlier versions, if
@@ -550,40 +553,16 @@ removed from the bridge, reconfigured, then re-added.
 To remove the VLAN configuration from a virtual switch, specify a
 .Ar vlan-id
 of 0.
-.It Cm switch nat Ar name Ar on|off
-Enable or disable NAT functionality on the specified switch.
-Please note that
-.Xr pf 4
-is required for this functionality and must be enabled in
-.Pa /etc/rc.conf .
-If DHCP is desired, please install the
-.Xr dnsmasq 8
-package.
-vm-bhyve will generate a sample dnsmasq configuration in
-.Pa /usr/local/etc/dnsmasq.conf.bhyve ,
-but it is up to the user to either use this configuration directly, or merge
-with any existing dnsmasq settings you have configured.
+.It Cm switch address Ar a.b.c.d/xx|none
+Configure an IP address for the specified virtual switch. The address should
+be specified in CIDR notation. To remove an address, specify
+.Pa none
+in place of the address.
 .Pp
-The switch should have no host ports assigned, as these will end up on the
-private side of the NAT network.
-.Nm
-automatically detects the hosts default gateway, which is used as the
-forwarding interface for NAT connections.
-.Pp
-Once enabled, a 172.16.X.0/24 network is assigned to the switch (bridge)
-interface.
-.Ar X
-is chosen based on the ID of the bridge interface.
-For example, if the switch is using bridge10, the network will be
-172.16.10.0/24.
-.Xr dnsmasq 8
-can be used to provide DHCP to the guests, and
-.Xr pf 4
-rules are inserted to provide the NAT translation.
-.Pp
-.Pa /etc/pf.conf
-is created if it doesn't exist, and a single include statement is added.
-This include statement can be moved within the file if required.
+If NAT funtionality is required, please configure an address on the switch to
+become the gateway address for guests. Source NAT rules can then be created
+using your choice of firewall or NAT daemon. If DHCP is desired, we recommend
+using a manual switch and configuring this by hand.
 .It Cm switch private Ar on|off
 Enable of disable private mode for a virtual switch.
 In private mode, guests will only be able to communicate with the physical