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What does a router do with IP packets?
What is a router? A router is a piece of network hardware responsible for forwarding packets to their destinations. Routers connect to two or more IP networks or subnetworks and pass data packets between them as needed. Routers are used in homes and offices for setting up local network connections.
Can router read the IP address of a packet?
The connections on a router are called interfaces: through the router, they interface between different link types. IP is a routed protocol: routers examine IP packets and route them out of an interface based on the destination IP address.
How does TCP router work?
TCP prepares the data by breaking it down into smaller pieces of information called “packets” while also defining and maintaining the network connection. IP deals with the sending and delivering of the packets from one computer or server to another using a web of routers in a process known as IP Routing.
What happens when a packet is sent to a router?
The frame is received by the Switch. The Switch forwards the frame to the default gateway, which, in the most of the cases, would be your router. The router receives the packet and removes the network layer header. After removing the header, it looks at the destination IP address in the packet.
How does nat work with incoming UDP packets from unknown?
My understanding of NAT is that UDP packets going out from the client to a specific endpoint will result in a temporary entry into the NAT table mapping the source port to the destination endpoint. (Is this right?)
How does a TCP packet get to its destination?
The router will then look up how to get to the destination IP address in its routing table. If it doesn’t find a route to the destination IP address in its routing table, the packet is discarded, otherwise the router will switch the packet to the next interface toward the destination and create a new layer-2 frame for the new interface.
What happens to the MAC address in a TCP packet?
When the frame is received by the router, the layer-2 frame, including the MAC addresses, is stripped off the packet and discarded, losing the original MAC addresses. The router will decrement the TTL and create a new header checksum, and inspect the layer-3 IP packet for the destination address.