Index: head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
@@ -5225,8 +5225,9 @@
VLANs are a way of virtually dividing up
- a network into many different subnetworks. Each will have its
- own broadcast domain and be isolated from the rest of the
+ a network into many different subnetworks, also referred
+ to as segmenting. Each segment will have its
+ own broadcast domain and be isolated from other
VLANs.
On &os;, VLANs must be supported by the
@@ -5239,7 +5240,7 @@
To configure VLANs at run time, with a
NIC of em0 and a
- VLAN tag of 5. The
+ VLAN tag of 5 the
command would look like this:
&prompt.root; ifconfig em0.5 create vlan 5 vlandev em0 inet 192.168.20.20/24
@@ -5266,5 +5267,38 @@
vlans_em0
field and adding an additional line configuring the network on
that VLAN tag's interface.
+
+ It is useful to assign a symbolic name to an interface so
+ that when the associated hardware is changed, only a few
+ configuration variables need to be updated. For example,
+ security cameras need to be run over VLAN 1 on
+ em0. Later, if the em0
+ card is replaced with a card that uses the &man.ixgb.4; driver,
+ all references to em0.1 will not have to
+ change to ixgb0.1.
+
+ To configure VLAN
+ 5, on the
+ NIC em0, assign the
+ interface name cameras, and assign the
+ interface an IP address of 192.168.20.20
+ with a 24-bit prefix,
+ use this command:
+
+ &prompt.root; ifconfig em0.5 create vlan 5 vlandev em0 name cameras inet 192.168.20.20/24
+
+ For an interface named video, use the
+ following:
+
+ &prompt.root; ifconfig video.5 create vlan 5 vlandev video name cameras inet 192.168.20.20/24
+
+ To apply the changes at boot time, add the following lines to
+ /etc/rc.conf:
+
+ vlans_video="camera"
+create_args_camera="vlan 5"
+ifconfig_camera="inet 192.168.20.20/24"
+