When in doubt about the required subnet mask for your PCD, please contact your network adminstrator. Of course the network will only work properly if all the devices are configured correctly. The PCD3 firmwares older than the one mentioned in the table below does not allow class A or B subnet masks if the IP adresses are not in the defined range (because this would be supernetting).įor the "Classless Internet Domain Routing" CIDR the network classes mentioned above aren't relevant for the subnet mask any more. Subnetting works with all PCD firmwares but supernetting does not (see example below). In classful networks (without subnetting) it is possible deriving the subnet mask based on the IP address accoring to the table below.įurther on, subnetting can be introduced by extending the "network portion" by using a part of the "host portion" (the right side of the subnet mask, in the classful network filled with "0"). We are now introducing the "Classless Internet Domain Routing" CIDR to our stack which provides increased flexibility when dividing ranges of IP addresses into separate networks. supernetting was applied), the communication didn't work. If the address/subnetmask was not conform to the rules (because e.g. As result only IP address/subnet masks that conformed to the "classul networks with subnetting" were allowed in certain firmware versions of the PCD3 and the PCD7.F655. The IP stack of our PCD controllers (PCD3 and PCD7.F655) was only supporting "classful networks with subnetting" according to the official IP standards. A 0.0.0.0 0.0.0.0 entry in your routing table can often be found as a default route to the outside world. Subnet Mask (Binary / Dotted Decimal) Subnet Mask (Slash/ CIDR Notation) Subnet Address N Formula (N0, 1, of Subnets-1) 0 (Default) 24. However, these limitations are (or will be) removed in recent firmware versions according the Classless Internet Domain Routing (CIDR). Table 52: Subnetting Summary Table For Class A Networks of Subnet ID Bit of Host ID Bits of Subnets Per Network of Hosts Per Subnet. There have been some limitations according the IP norm that allowed only certain combinations of IP adresses and subnet masks (only classful networks with subnetting were allowed).
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