How to bring internet to a network with a different subnet

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marygpascu

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Jan 28, 2018
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Hello everyone. Here's my issue:

I have a network with 3 computers, one NAS, all connected through a Cisco Gigabit switch. The NAS does the DHCP (the switch doesn't have DHCP).

I need to bring internet to this network. What I have is a TP-Link 100Mbps wireless router connected through PPOE to internet.

How can I do this while keeping the TP-Link DHCP for devices like phones and stuff, and the computer network to only have the internet.

If I connect them together I have one big issue, the router DHCP takes over and now I have a 100Mbps network instead of gigabit, the speeds go down to unusable (for my application) since all the traffic goes through the router.

The second is that I didn't want the computers and the NAS to be on the same LAN as the phones connected to the router. I can enable AP Isolation which should keep them from seeing each other I think, but I would prefer them to be in a different network

Is there a way to only bring the internet from the router to this network, and only the internet ?
 
Solution
S


Using your router for DHCP should not slow the network down whatsoever. No traffic between the 3 computers and NAS should ever go through the router.

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marygpascu

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Jan 28, 2018
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If I connect the router to the switch, what happens is that the router DHCP takes over, assigns IP's to the computers on the network, and the communication between my computers becomes painfully slow.

What I tried is assign manual IP's to the computers and the NAS, and the router's IP as the gateway. But the internet does not work. They are in different subnets. The network is in 192.168.1.X and the router's LAN is in 192.168.100.X. Tried to give the computers on the network 255.255.0.0 as subnet mask, but internet still doesn't work.
 
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stu17323

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Sep 6, 2017
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Why can't you just make the static IP's in the same subnet as the router? Although I would just turn off the DHCP server in the NAS and let the router manage it.

Changing the subnet mask on the computers will not work as the router's subnet is still only 192.168.100.X.
 
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marygpascu

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Jan 28, 2018
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The router has to have DHCP enabled because it is used by the phones and other devices. If I let the router manage the computer network my transfer speeds drop to unusable levels, because all the network traffic goes through the router, which is a 100Mpbs cheap consumer router. That's why I need to keep the computer network separate, and only bring the internet to it
 
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stu17323

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Sep 6, 2017
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Using your router for DHCP should not slow the network down whatsoever. No traffic between the 3 computers and NAS should ever go through the router.

 
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Solution
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marygpascu

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Jan 28, 2018
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That makes sense and that's what I hoped, but for some reason as soon as I connect the router to the switch and the router's DHCP assigns the IP's, the speeds between the computers and the NAS goes down 10 times, which is exactly by how much the router (100Mbps) is slower than the switch and the computers (1000Mbps)
 
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stu17323

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Sep 6, 2017
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Can you post results of a trace route to one of the computers or server.
 
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marygpascu

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Jan 28, 2018
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It works now. I don't know why but I turned off dhcp and assigned manual ip's again, and it worked. Weird that now if I re-enable DHCP and let the router assign IP's just like before, there is no drop in speed anymore, it works like stu17323 said it should. Have no idea why it didn't worked before, but I'm glad it does work now. Thank you for your help
 
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