connect 2 PCs to 1 internet provider's modem silmultaniously

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phil huber

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Aug 23, 2014
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Two separate computers now use internet of same provider through a ISP router. A techi told us we'd be better off if we used a RJ45 splitter at the provider's router and run two cat5 ethernet cables (one to each computer). When I look into buying this stuff, I'm told that both computers cant be online at the same time. What is the real case? Can you help me, please? Thank you. Phil
 
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USAFRet
To reiterate:
ISP -> modem -> router -> multiple devices.

The modem gets one and only one IP address from the ISP. You can have either a single PC connected directly to the modem, or a single router connected to the modem.
The router then creates internal IP addresses for your devices....generally 192.168.1.xxx.

A 'splitter' or switch connected directly to the modem won't work. The modem only passes one IP address. You need the router brain to generate the internal IP addresses. There should be a WAN port (probably yellow) on the back of the router. That goes to the modem. Your devices plug into the other LAN ports.
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USAFRet

USAFRet

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ISP -> modem -> router -> multiple devices, either wired or WiFi.
(modem and router may be in the same plastic case)

Whoever told you that you can't have both PC's online at the same time is either way clueless, or he knows something about your particular ISP that is very weird.
 
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BuddhaSkoota

BuddhaSkoota

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Aug 16, 2014
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If the device provided by your ISP has only one Ethernet port, then it is likely a modem only and not a router. Because your ISP provides just one IP address for your home, a modem by itself can't support more than one computer. A computer connected directly to the modem is also completely exposed to attacks since it is assigned the public IP address.

Also, no RJ45 splitter will allow you to connect more than one device directly to your modem.

So, a router (wired or wireless) is required behind the modem (or can sometimes be integrated with the modem). The router is assigned the singular public IP address, and assigns different private IP addresses to each of your connected devices.
 
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phil huber

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Aug 23, 2014
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USAFRet

USAFRet

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A $1.88 'splitter' is of no use.
Modem -> router -> multiple devices.
How many ports are are on the back of your 'router'? Probably 4. That is all you need. If you need more than 4 wired devices, than a switch is needed...not a '$1.88 splitter'.
 
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phil huber

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Aug 23, 2014
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phil huber

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Aug 23, 2014
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Thanks for your attention to this USAF Retired. Note that I changed my original query to correct the error wherein I misspoke the nomenclature. The equipment from the provider is a modem, not a router. It has only one RJ45 port (female). The router presently connected is my own and that is what I want to bypass and still have two computers in operation at the same time. The techi said to simply unplug my router's RJ45 from IP's single port, then plug in the splitter and in the dual part of that splitter run two lines (one to each of the computers. Sounds simple and easy but I got a warning that both computers cant be connected and share the IP's modem at the same time. Again thank you for your time. Any further comments/ideas are welcome.
phil



 
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USAFRet

USAFRet

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To reiterate:
ISP -> modem -> router -> multiple devices.

The modem gets one and only one IP address from the ISP. You can have either a single PC connected directly to the modem, or a single router connected to the modem.
The router then creates internal IP addresses for your devices....generally 192.168.1.xxx.

A 'splitter' or switch connected directly to the modem won't work. The modem only passes one IP address. You need the router brain to generate the internal IP addresses. There should be a WAN port (probably yellow) on the back of the router. That goes to the modem. Your devices plug into the other LAN ports.
 
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