[kate22in]

Hai,

Modem ----- Router ------ PC 1
------ PC 2


Assume router has a default IP of 192.168.1.1 & Pc's 192.168.1.2 & 192.168.1.3.

My question is when 2 Pc's access internet simultaneously,how does the router know which computer requested for the information ? I doubt that it works based on port numbers.(logical).If that's right then how will the computer send it's port information to the router ?Or where is that infomation present in the packet ?To add on what packets does computer's use ?TCP or UDP ?When we say a computer sends data what type of packet is it ?

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My question is when 2 Pc's access internet simultaneously,how does the router know which computer requested for the information ?

MAC address. Every single network interface device has it's own, one-of-a-kind MAC address.

[thenotch]

My question is when 2 Pc's access internet simultaneously,how does the router know which computer requested for the information ?

MAC address. Every single network interface device has it's own, one-of-a-kind MAC address.

[kate22in]

Yes that's true.But i believe that Router is a Layer 3 device which can understand only Logical addresses.So i don think that a router can understand mac address.

[Kurenai]

No, my router's mac filtering table assures me that it can see MAC addresses perfectly well. Essentially, the router is on layer 3 and binds IP addresses to mac addresses.

Edit - well...home routers don't fit directly into the OSI model, as they've got a router component, and then a switch, normally 4 port, attached, so the above might not be entirely accurate.

Edited by Kurenai, 12 November 2006 - 05:14 AM.