+With in-band control, the location of the controller can be configured
+manually or discovered automatically:
+
+.RS
+.IP "controller discovery"
+To make \fBsecchan\fR discover the location of the controller
+automatically, do not specify the location of the controller on the
+\fBsecchan\fR command line.
+
+In this mode, \fBsecchan\fR will broadcast a DHCP request with vendor
+class identifier \fBOpenFlow\fR across the network devices added to
+the datapath with \fBdpctl addif\fR. It will accept any valid DHCP
+reply that has the same vendor class identifier and includes a
+vendor-specific option with code 1 whose contents are a string
+specifying the location of the controller in the same format used on
+the \fBsecchan\fR command line (e.g. \fBssl:192.168.0.1\fR).
+
+The following ISC DHCP server configuration file assigns the IP
+address range 192.168.0.20 through 192.168.0.30 to OpenFlow switches
+that follow the switch protocol and addresses 192.168.0.1 through
+192.168.0.10 to all other DHCP clients:
+
+default-lease-time 600;
+.br
+max-lease-time 7200;
+.br
+option space openflow;
+.br
+option openflow.controller-vconn code 1 = text;
+.br
+class "OpenFlow" {
+.br
+ match if option vendor-class-identifier = "OpenFlow";
+.br
+ vendor-option-space openflow;
+.br
+ option openflow.controller-vconn "tcp:192.168.0.10";
+.br
+ option vendor-class-identifier "OpenFlow";
+.br
+}
+.br
+subnet 192.168.0.0 netmask 255.255.255.0 {
+.br
+ pool {
+.br
+ allow members of "OpenFlow";
+.br
+ range 192.168.0.20 192.168.0.30;
+.br
+ }
+.br
+ pool {
+.br
+ deny members of "OpenFlow";
+.br
+ range 192.168.0.1 192.168.0.10;
+.br
+ }
+.br
+}
+.br
+
+.IP "manual configuration"
+Configuring in-band control manually requires