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Networking theory

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You mean just connecting those two PC's together? 

Yes, but it's not that simple. First, if those are old PC's, a crossover Ethernet cable is needed. Second, you need to configure static ip's, since there are not DHCP server and third, how would you use this 1Gbps link? Some applications can be unsupported for that or need to be configured (just though about game streaming)

 

Just for testing, you could try that by just connecting them, disconnecting the cables on the router, you don't need internet for a local transfers I suppose, right?

I have 2 computers and 1 router and want to get 1GBit/s between the 2 computers, but my router is only 100Mb, so I thought, Could I just connect the 2 PCs to the router with the onboard, 100Mb Ethernet port and have a cheap 1Gbit PCIe card and have an Ethernet cable connecting the two. Would this work? (Just as an alternative to buying a 1Gbit Switch/Router)

 

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A ring topology? Yes it can work though there are better alternatives. The only issue I think you might have with this is what interface the OS deems fastest. You might have to play with the metric of the interface which should manually tell the system the preferred path for network communications between the machines. 

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You mean just connecting those two PC's together? 

Yes, but it's not that simple. First, if those are old PC's, a crossover Ethernet cable is needed. Second, you need to configure static ip's, since there are not DHCP server and third, how would you use this 1Gbps link? Some applications can be unsupported for that or need to be configured (just though about game streaming)

 

Just for testing, you could try that by just connecting them, disconnecting the cables on the router, you don't need internet for a local transfers I suppose, right?

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As mentioned, the easiest way is to get a Gigabit switch, plug a single ethernet cable from your router into the Gigabit switch, plug the PCs into the Gigabit switch.

 

As also pointed out, it might be worth considering just replacing the router with one that already has a Gigabit switch built into it.  It may slightly improve your broadband performance.

ASUS B650E-F GAMING WIFI + R7 7800X3D + 2x Corsair Vengeance 32GB DDR5-6000 CL30-36-36-76  + ASUS RTX 4090 TUF Gaming OC

Router:  Intel N100 (pfSense) Backup: GL.iNet GL-X3000/ Spitz AX Switches: Netgear MS510TXUP, MS510TXPP, GS110EMX
WiFi6: Zyxel NWA210AX (1.7Gbit peak at 160Mhz) WiFi5: Ubiquiti NanoHD OpenWRT (~500Mbit at 80Mhz)
ISPs: Zen Full Fibre 900 (~930Mbit down, 115Mbit up) + Three 5G (~1200Mbit down, 115Mbit up, variable)
Upgrading Laptop/Desktop CNVIo WiFi 5 cards to PCIe WiFi6e/7

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