LAN and DHCP F-3 Using DHCP
MS20xxB UG PN: 10580-00301 Rev. D F-5
F-3 Using DHCP
When using DHCP, no setup is required to lease and use a dynamic IP address. In a dynamic
IP operation, the assigned IP address may change from use to use. The DHCP server assigns
IP addresses on a time rotation basis. As soon as the device is disconnected from the network,
the IP address that it was using becomes available to lease to the next unit requesting an IP
address. Normally, some amount of lag time occurs on the DHCP server end, so if the device
is connected again reasonably soon, it may receive the same address.
F-4 Static IP Address
When a DHCP server is not available, a Static IP address can be used. A Static IP address is
a fixed address. After being set, it will always remain the same, and care must be taken to
avoid conflict with other equipment on the network.
When using a static IP address on an established network, always request a Static IP address
from the network administrator. Randomly choosing a Static IP address on an established
network may result in duplicate IP addresses or other conflicts.
Three parameters must be set prior to using a Static IP address:
IP Address
This is the Static IP address on the network.
Default Gateway
Often when a static IP address is assigned, a default gateway is also identified. If the default
gateway is unknown, then type in the Static IP address so that the Static IP address and
Default Gateway are the same number.
Subnet Mask
This parameter is usually extracted from the Static IP address based upon the class of the
address. It determines the destination of any broadcast messages that might be sent from the
instrument. It can be customized if necessary. The subnet mask may also be provided with
the Static IP address.
Example 1
In this example, a Static IP address has been chosen because no network is available. The
instrument is connected to the network port on the PC with a crossover Ethernet cable (not
included). This is also referred to as Direct Connect:
IP Address: 10.0.0.2
Default Gateway: 10.0.0.2
Subnet Mask: 255.255.0.0
Note
The VNA Master must be connected to the network before it is turned on in order
to allow DHCP to work. Key elements of the DHCP lease are performed only
during the instrument startup operations or when switching from manual to DHCP.
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