Can't have 3 computers on an unmanaged switch

[swinnie23]

I have a NetGear ProSafe FS105 5 Port Switch. With two computers connected via Ethernet cables, each computer has access to the Internet. When I try to add a third computer, I am unable to connect to the Internet. The message reads "Unidentified Network, No Internet"

[antinode]

> I have a NetGear ProSafe FS105 5 Port Switch. [...]

   Connected to what?

> With two computers connected [...]

   Any two computers, or two particular computers?

> [...] When I try to add a third computer, [...]

   Any third computer, or one particular third computer?

> [...] The message reads "Unidentified Network, No Internet"

   Message from what?  What is the OS on this computer?  What, exactly,
are you doing to get this message?

   I doubt that the problem is with the switch; it's more likely with
something between the switch and your ISP.  (The important stuff, about
which you've provided no information.)

[swinnie23]

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@antinode wrote:

> I have a NetGear ProSafe FS105 5 Port Switch. [...]

   Connected to what? ARRIS Model CM820A Modem

> With two computers connected [...]

   Any two computers, or two particular computers? Yes, two particular computers (one Dell latop, one iMac desktop)

> [...] When I try to add a third computer, [...]

   Any third computer, or one particular third computer? The third is an Acer laptop.

> [...] The message reads "Unidentified Network, No Internet"

   Message from what?  What is the OS on this computer?  What, exactly,
are you doing to get this message? The Acer laptop has Windows 10. I have an Ethernet cable plugged into the laptop. When I turn on the laptop, the icon for the network shows there is no connection. When I hover over the icon, it says "Unidentified Network, No Internet." I haven't created a network, the other two computers mentioned above just worked when I plugged the Ethernet cables into the switch.

   I doubt that the problem is with the switch; it's more likely with
something between the switch and your ISP.  (The important stuff, about
which you've provided no information.)

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[schumaku]

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@swinnie23 wrote:

I have a NetGear ProSafe FS105 5 Port Switch. With two computers connected via Ethernet cables, each computer has access to the Internet. When I try to add a third computer, I am unable to connect to the Internet. The message reads "Unidentified Network, No Internet"

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Most cable ISP associate just one or very few (here obviously a max of two) public IP addresses to a modem. This is typically to operate a single (or very few) computers, or more to connect a NAT router with wireless and switch ports. 

[antinode]

> [...] ARRIS Model CM820A Modem

   That's a simple modem, not a (modem+)router.  Without a router, I'm
impressed that you got more than one device to work at one time.

> [...] The third is an Acer laptop.

   The question was whether you could get two different computers to
work, for example, the Dell and the Acer.  And then the Mac would fail
if you tried to make it the third?

   Without knowing more about the service provided by your ISP, it's
tough to be specific, but a typical user gets one public IP address,
which allows him to connect one device.  To connect more devices, you
get a NAT router, make that router the one device which is connected to
the modem, and then connect all the client devices to that router.

   Some users get a block of IP adresses from their ISP, rather than a
single address, but that would typically give you five, not two.  They
could give you two (or any other number), but I haven't seen that.

   In any case, if you have more client devices than you have public IP
addresses, then you'd need a NAT router to let multiple client devices
share a single public IP address.