Routing Interview Question:

How to Set a Netmask under Solaris?

Submitted by: Administrator

In order to include a permanent netmask on your Solaris machine, you must make an entry in the /etc/netmasks file, in the following format: network-address netmask For example: %%%% cat /etc/netmasks 150.101.0.0 255.255.255.0 The above would subnet the class B network, 150.101.0.0, into 254 subnets, from 150.101.1.0 to 150.101.254.0. In 2.5.1 and below, only one entry for the entire class network is allowed to support standard subnetting as specified in RFC-950 It is important to note that the entry in the left hand column must be the original base network number (ie #.0.0.0 for a Class A, #.#.0.0 for a Class B and #.#.#.0 for a Class C), not the subnet. The 2.6 kernel has changed to support VLSM. It is now possible to combine the RFC-950 and RFC-1519 form of subnet masks in the netmasks file. The network address should be the "SUBNETTED" address NOT the standard network number based on the hosts ip address. (see man page for netmasks) Here are a few examples: A host address 192.188.206.65 with a netmask of 255.255.255.224 /etc/netmasks 192.188.206.64 255.255.255.224 A host address 172.31.16.193 with a netmask of 255.255.255.192 /etc/netmasks 172.31.16.192 255.255.255.192
Submitted by: Administrator