Linux I am aware of

A virtual IP address ( VIPA ) is an IP address assigned to multiple domain names or servers that share an IP address based on a single network interface card (NIC). VIPAs are allocated to virtual private servers, websites or any other application residing on a single server. The host server for these applications has a network IP address assigned by a network administrator, whereas the different server applications have VIPAs. VIPAs enhance network load balancing and redundancy. VIPAs are primarily implemented for the following reasons: To consolidate resources through the allocation of one network interface per hosted application To improve redundancy by providing alternative failover options on one machine A server IP address depends on the Media Access Control (MAC) address of the attached NIC, and only one logical IP address may be assigned per card. However, VIP addressing enables hosting for several different applications and virtual appliances on a server with only one

IP addressing and subnetting are an important part of networks. Learn about how IP addresses work, subnet masks, classful vs. classless IP addresses, default gateways and more. Most network administrators have learned about IP addressing and subnetting at one time or another. However, just  like a foreign language, if you don't use it, you will quickly forget it. In this article, I provide an overview of what network administrators need to know about IP addressing and subnetting. I believe this overview will be beneficial to the seasoned administrator who hasn't worked with IP in a while, as well as to novice network administrators who need to know what they should learn without having to spend a long time doing it. 1. What do you need to know about addresses? You probably know what an IP address is: a number that identifies that device on the network. But what else do you need to know? IP addresses are made up of 32 bits (IPv4 addresses, that is). We normally thin

IP addressing and subnetting are an important if basic part of networks. Network administators will learn how to calculate a subnet mask using the host's formula. In this article, we will continue learning important IP addressing and subnetting information, and we will learn how to apply this valuable information to some real-world scenarios. Review Before we move on, I'd like to review some information that was covered in part one of this series,   IP addressing and subnetting: What network administrators need to know . IP addresses must be unique on the Internet (when using public IP addresses) and on a private network (when using private IP addresses). DHCP is commonly used to hand out IP addresses. This helps to keep addresses unique, provides a database of addresses assigned and prevents administrators from having to assign addresses statically. IP addresses are 32 bits (made up of four octets of 8 bits each). A subnet mask is what tells the computer what par