SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 139 (160)
# ip dns server 10.10.10.10 10.10.10.11
# ip dns show
DNS Client Configuration
DNS Servers: 10.10.10.10, 10.10.10.11
#
The example above shows how the SatLink DNS client is configured to use the DNS servers 10.10.10.10
and 10.10.10.11.
Note that when the internal SatLink DHCP server is enabled, the SatLink VSAT will configure the hosts
on its LAN to use the SatLink VSAT as the primary DNS server, and its own DNS client’s primary DNS
server as the secondary DNS server. This is done in order to let the hosts use the DNS Forwarder of the
SatLink VSAT to reduce the time for DNS lookups and especially improve the speed of Web browsing.
H.3 Configuration of the DHCP Server
To handle automated address assignment, the IETF has designed a protocol (RFC 2131) known as
Dynamic Host Configuration Protocol (DHCP). DHCP allows a computer to acquire automatically all IP
configuration information it needs when entering the network.
Whenever a new computer connects to the STM SatLink VSAT’s LAN and the DHCP server in the
VSAT is enabled, the computer will be allocated an IP address by the DHCP server from the pool of
addresses defined by the STM SatLink VSAT LAN subnet (defined by the LAN net mask).
IP addresses that will not be allocated automatically to new computers are the STM SatLink VSAT’s own
IP address and eventually IP addresses specifically excluded during configuration.
The VSAT administrator has the possibility to configure the following parameters:
• Server Status: Enable or disable the STM SatLink VSAT LAN DHCP server.
• Lease time: Set the lease time for an IP address allocated to a host on the LAN
• No. of IP addresses excluded: Specifies the number of IP addresses to be excluded from the
available range of addresses defined by the STM SatLink VSAT LAN subnet. The excluded
range of IP addresses will be the upper range of the LAN subnet. I.e. if the STM SatLink VSAT
LAN is allocated the IP addresses 10.10.10.1 to 10.10.10.254, and 2 IP addresses are excluded for
use by the DHCP server, then the DHCP server will have the IP address range 10.10.10.1 to
10.10.10.252 available for DHCP clients.
The DHCP server in the SatLink VSAT is enabled in the factory default configuration. To disable the
DHCP server, use the CLI command
ip dhcp disable.
The lease time of IP addresses can be configured using the CLI command
ip dhcp leasetime.
Example
# ip dhcp leasetime 1 D
The command in this example will configure the lease time to 24 hours (one day).
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