Chapter3 EthernetConfiguration
©NationalInstruments Corporation 3-7 GPIB-ENET/100for Mac OS
For a Network without a Network Administrator
Ifyou are assembling your own small Ethernet network, you can choose
your own IP addresses. The format of the IP addresses is determined by
the subnet mask. You should use the same subnet mask as the computer
you areu sing with your GPIB-ENET/100. If your subnet mask is
255.255.255.0,the first three numbers ine very IPad dress on the
network must be the same. If your subnet mask is 255.255.0.0,only
the first two numbers in the IP addresses on the network must match.
Foreither subnet mask, num bers between 1 and 254 are validchoices for
thelast number of the IP address. Numbers between 0 and 255 are valid for
the third number of the IP address, butthis number must be the same as
other deviceson your network if you r subnet mask is 255.255.255.0.
Table3-1 shows examples of valid and invalid IP addresses fora network
using subnet mask 255.255.255.0. All validIP addresses contain the
same firstthree numbers. The IP add resses in this table are for example
purposes only.
Ifyou are setting up your own network, you probably do not have a gateway
orDNS server, so you should set these values to 0.0.0.0.
Table3-1. Valid and Invalid IP Addresses for Subnet Mask 255.255.255.0
IPAddress Comment
123.234.45.211 Valid.
123.234.45.213 Valid.The first three numbers match the previous
IPadd ress.The fourth n umber must be a unique
number in the range of 1 to 254.
123.202.45.214 Invalid.Second number does not match the
previousIP addresses. The first three numbers
mustmatch on all IP addresses with subnet mask
255.255.255.0.
123.234.45.0 Invalid.The first three numbers are valid but the
fourth number cannot be 0.
123.234.45.255 Invalid.The first three numbers are valid but
the fourth number cannot be 255.