Table of Contents
What can you determine with an IP address?
For the most part, an IP address tells you the city, ZIP code, or area code of your ISP, as well as your ISP’s name. What can an IP address tell you? To some degree, your physical location and also the name of your ISP.
Do all routers know how do you get to every IP address on the internet?
Router don’t need to know every single address. Routers exchange prefixes (networks), and the ISPs generally will only advertise /24 or shorter prefixes for IPv4 ( /48 or shorter for IPv6). The routing table contains prefixes, and an interface to reach each prefix.
How do router routes data packets?
When a data packet comes in on one of the lines, the router reads the network address information in the packet header to determine the ultimate destination. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey.
How a router uses the addressing field in an IP header to determine where to forward a packet?
The router uses the information in the IP header to decide whether and where to forward each received packet, and which network interface to use to send the packet. Most packets are forwarded based on the packet’s IP destination address, along with routing information held within the router in a routing table.
Do routers have unique IP addresses?
Routers are special because they have two IP addresses. An IP address is assigned to each of the router’s two “interfaces”. This is the side of the router that faces the Internet and has a public IP address. The second router interface is called the LAN (Local Area Network) interface.
Why do all routers have same IP address?
Now depending upon what networks are connected by a router, it gets one unique IP from each of the networks for each of its interfaces. For the interfaces that are connected to private networks, many routers may have the same private IP address because those networks can never connect directly.