Netscaler - A hardware and software solution providing advanced application and service delivery. Netscaler is a reverse-proxy with high-speed load balancing and content switching, data compression, content caching, SSL acceleration, network optimization, application visibility and application security on a single platform
Thursday, January 8, 2015
L4 Router and Load Balancer
Layer 4 -Basically a router with NAT capability
The level 4 refers to the Transport layer in the OSI model. A router with NAT (Network Access Translation) feature is considered a Layer 4 router instead of a typical network router which resides in the Layer 3 of the OSI model. The layer 4 Load Balancing router uses different rules to make decisions on where to route traffic. So servers and other machines with least load or fastest response times will receive the packets from the L-4 router
A typical network router simply sends incoming packets onto the appropriate IP address on its network. A layer 4 router, more correctly a NAT with port and transaction awareness, uses a little trickery and sends incoming packets to one or more machines which are hidden behind a single IP address.
The layer 4 refers to the 7 layer OSI model. The router is on the Transport Layer and makes decisions on where to send the packets. Modern load balancing routers can use different rules to make decisions on where to route traffic. This can be based on least load, or fastest response times, or simply balancing requests out. This is also a redundancy method, so if one machine is not up, the router will not send traffic to it.
L4 Load Balancer capability
A hardware and software solution providing advanced application and service delivery. Netscaler is a reverse-proxy with high-speed load balancing and content switching, data compression, content caching, SSL acceleration, network optimization, application visibility and application security on a single platform
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