User manual

Chapter 4 - Layer 3 Command Set - IP Networking DHCP Server
Alvarion BreezeNET B130/B300 GigE 226 Operational User Manual
is connected to another network, the direct dialog cannot take place. However, the
device which logically connects two networks with DHCP client and DHCP server
can have a special software running - DHCP Relay Agent (DRA). DRA retranslates
DHCP packets (including broadcast packets) from DHCP clients to DHCP server
and back. Data exchange between DRA and DHCP server is performed using
unicast packets only. Thus, DRA and DHCP must know each other's IP-addresses
starting from their configuration stage. For this purpose DHCP server has virtual
interfaces. In fact DHCP-server virtual interface is a physical network interface
placed in DRA. As DHCP does not know this interfaces subnets sets, one should
specify these subnets while virtual interfaces configuration.
To create virtual interface, use the command:
Syntax:
dhcpd add virtual interface <GATEWAY>
where
 GATEWAY - IP-address of DRA which has a corresponding physical interface.
After executing this command, one more interface is created in server's
configuration with a name formed from DRA's IP-address: v.GATEWAY.
Example: v.192.168.177.81
Example:
#1> dhcpd add virtual interface 192.168.177.81
[v.192.168.177.81]
Virtual interface v.192.168.177.81 added
OK
#1> dhcpd show interface *
>INTERFACES
[eth0] UP
<SUBNET> 9.1.1.100/255.255.255.0
<SCOPE> (PHONES) 9.1.1.151 - 9.1.1.200
<SUBNET> 192.168.177.12/255.255.255.0
<SCOPE> (MSOFT) 192.168.177.20 - 192.168.177.50
<SUBNET> 192.168.15.55/255.255.255.0
<RESERVATION> for ID:01:00:05:90:02:1F:C8