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Modem to Switch

R

Ruger22C

Golden Member
Is this possible? I know some ISPs don't allow more than one MAC, so you have to copy yours in your router settings... However, if they don't -

Can you connect a switch to a modem, then a router to the switch, and also another computer to the switch (not router.)? I'm asking because I don't understand how it would handle the MAC and NAT. How does it know if the data goes to the computer on the switch, or the one behind the router?

Thanks.
 
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you get one IP address if it is really a modem. You cannot run traffic to multiple computers without using a router, if you have a single IP from your ISP.
 
If your ISP allowed you to pull multiple IPs, then the router (connected to the switch) would pull one, and the computer (connected to the switch) would pull another. All computers connected behind the router would share the router's WAN IP, and the computer connected directly to the switch would also have a different WAN IP.

But most ISPs only allow one IP address per modem, so in practice, either the computer on the switch, OR the router, would pull an IP, and the other one simply wouldn't be able to connect to the internet.
 
From a "Can I do it?" perspective, yes. Will it work? Depends on the ISP. It works because the switch is just forwarding frames from/to the router's WAN port to/from the modems Ethernet port.
 
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