Packet Flow From Switch To Router

The biggest thing to keep in the back of your mind is two things.

Packet flow from switch to router.

Thanks for the series i wish to know how the packet flow between two switches with one host 192 168 1 1 24 in one switch and another host 192 168 1 5 24 in another switch. A layer 2 non managed switch has no layer 3 capabilities at all so cannot dive into the frame payload. The packet is received by the switch which in turn broadcast the request to host b and d. Routers connect two or more logical subnets which do not necessarily map one to one to the physical.

This is also called stateful processing of traffic. Here s the network we are going to be playing with today. The router use the next hop ip and interfaces to be used to build the new data link frame 13. Today we are going to see how switches and a router interact with each other by tracing arp and icmp packet flow.

Else the packet has to be routed. Packet mode and flow mode. Ip packet s flow across the network. Router check for the most matching prefix to the destination 12.

In flow mode srx processes all traffic by analyzing the state or session of traffic. Routers and switches are both computer networking devices that allow one or more computers to be connected to other computers networked devices or to other networks. Packet flow in switch and router the answer is a bit more complicated than a simple yes or not but generally yes. If not packet dropped with icmp time exceeded 11.

I am going to map each step to the upper large figure so i recommend to print or open it in different window to map each step. Host d will reject the request and the host b will accept it and generates an arp reply for the mac address 000b be8e 5202 router fa0 1 mac address because the arp reply has to be given to that mac address from which arp request has been recieved. Tracing packet flow between a 2 switches and a router. The packet exits through the switch cpu port and it will be further processed by the routeros packet flow.

The functions of a router switch and hub and are all different even if at times they are integrated into a single device. We re going to look at a couple of things here. Run a packet through the switch host table to make a forwarding decision. In case any of the above mentioned points are true the packet gets forwarded to the switch cpu port.

In packet mode srx processes the traffic as a traditional router on a per packet basis. Checks the ttl value is 1.