Meggitt VM600 User Manual

VM600 networking manual MAVM600-NET/E 5 - 7
Edition 9 - February 2018
Gateways
ETHERNET COMMUNICATIONS WITH A VM600 RACK
5.5 Gateways
In general terms, a gateway is required to allow communication between two different
networks or subnets (see 1.4.2 Connectivity within networks).
In the example shown in Figure 5-5, System 1 can communicate directly with System 2, as
both have an IP address beginning with 10.10. However, System 1 cannot communicate
directly with System 3 as the IP addresses are too different. A gateway is therefore needed.
System 1 can communicate with the gateway as both have an IP address beginning with
10.10. Likewise, System 3 can communicate with the gateway as both have an IP address
beginning with 194.11.227.
NOTE: A gateway must belong to the same subnet as the network for which it is acting as
a go-between, that is, the same subnet mask applies.
Note that if the subnet mask for subnet “A” was changed from 255.255.0.0 to 255.255.255.0,
communication would no longer be possible between System 1 and System 2 or between
System 1 and the gateway.
For a VM600 rack, Ethernet communication between the host computer and the VM600 rack
can only take place if the IP addresses of the host computer and the VM600 rack (CPUM
card) belong to the same subnet.
Subnet “A” (10.10.xxx.xxx)
Subnet “B” (194.11.227.xxx)
System 1
IP address =
10.10.56.56
Subnet mask =
255.255.0.0
10.10.1.254
194.11.227.90
Gateway
System 2
IP address =
10.10.57.5
Subnet mask =
255.255.0.0
System 3
IP address =
194.11.227.5
Subnet mask =
255.255.255.0
Communication
possible
Communication
possible
Figure 5-5: Communication between two subnets using a gateway
Communication
possible

Meggitt VM600 Specifications

General

Brand	Meggitt
Model	VM600
Category	Measuring Instruments
Language	English