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How does IP packet routing work?
IP Routing describes the process of determining the path for data to follow in order to navigate from one computer or server to another. A packet of data traverses from its source router through a web of routers across many networks until it finally reaches its destination router using a routing algorithm.
What determines the route taken by a packet?
2.1) A primary function of a router is to determine the best path to use to send packets. To determine the best path, the router searches its routing table for a network address that matches the destination IP address of the packet. If there is a default route, the packet is forwarded to the Gateway of Last Resort.
What are IP rules?
IP rule is a policy routing function of Linux systems. Compared with the classic routing algorithms used on the internet that make routing decisions based only on the destination address of packets, IP rule is more flexible which can support more filter attributes for route forwarding.
Can You route a packet based on source IP address?
Obviously yes! Policy-based routing ( PBR) provides a tool for forwarding and routing data packets based on policies defined by network administrators. In effect, it is a way to have the policy override routing protocol decisions.
How are data packets routed across the Internet?
The following protocols help data packets find their way across the Internet: IP: The Internet Protocol (IP) specifies the origin and destination for each data packet. Routers inspect each packet’s IP header to identify where to send them.
How does a router forward packets in a network?
For more information about how routers forward packets, refer to Planning for Routers on Your Network. Routing protocols handle routing activity on a system and, by exchanging routing information with other hosts, maintain known routes to remote networks. Both routers and hosts can run routing protocols.
How does routing work in an IP network?
In packet-switching networks, such as the Internet, routing selects the paths for Internet Protocol (IP) packets to travel from their origin to their destination. These Internet routing decisions are made by specialized pieces of network hardware called routers. Consider the image below.