PACKET TRAVELLING IN ROUTER TO ROUTER

[stamil]

I have an doubt that how the packet is transferred over the router to router.

And how the switch works

[Mark Malone]

Thats a very genric question is there a certain part your unsure about ?
this doc link below provides a good example for how it works through a switch and through a router by itself from host level , switches can operate differently depending on there methoid of transfer again explained in the doc
Any specific questions send back we can try clear up

http://www.practicalnetworking.net/series/packet-traveling/packet-traveling/

[stamil]

THANK YOU very much for that docment that was very much usefull for study

I Have one major doubti on the tcp packet which transfer from the router to another , the packet is comprises of source and desination (port,ip and mac address) then it passes through each router the address of the packet remains same or it may differ

I'M an Engineering student I'm doing an project based on tcp/ip so I nedd clear picture please make the clear view about it

[Jon Marshall]

The mac address changes at each L3 hop but the IP and the TCP port number remains the same from end to end (assuming no NAT configuration). 

Jon

[stamil]

Hi Jon Marshall,

 there is some another doubt, which is occurs on your statement

the doubt is the address in l3 is changing then how it will is monitored

then how it reach the host machine again

I'm sorry please try to understand because I'm not that much well in language

[Jon Marshall · Accepted solution]

Only the L2 address changes at each L3 hop whereas the IP address stays the same end to end and this is how packets are routed between networks. 

Jon

[Mark Malone]

the source and destination address at layer 3 will remian the same unless maybe if NAT is in use however what i think you maybe thinking about or seen somewhere is that the frame is definilty reomoved whihc is the layer 2 frame as that changes as it is moved through differnet physical interfaces in path to its destination

[Mark Malone]

ah Jon has answered it :) while i was typing