Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a network with DHCP from the WirelessRouter.

----<WirelessRouter/Router>----<-100meters->----<?ANOTHER ROUTER?>-----to other computers
----Connected to other computers

For the 100 meters, I use copper wire. Do I need to use a crossover setup for RJ45? Or can I just use the standard setup of RJ45?

Here in my house, I already set up the 100 meters with a standard setup, in which if we remove the <?ANOTHER ROUTER?>, the 100 meters will connect directly to one computer only.

I want to add some routers there, but my instructor said that a standard setup of RJ45 will not work for router-to-router here.

Maybe I missed something above, I forgot what a crossover setup or a standard setup is. I assume that crossover is for router-to-router or a computer-to-computer connection. Correct me if I'm wrong.

share|improve this question
"Newer routers, hubs and switches (including some 10/100, and all 1 Gigabit or 10 Gigabit devices in practice) use auto-MDIX to automatically switch to the proper configuration once a cable is connected." Auto-MDIX wikipedia article – Ampersand Nov 21 '11 at 18:31

Just remember simple rule:

when the devices are same, then crossover cable is used.

when devices are different, Straight cable is used.

so for router-to-router we need crossover cable.

share|improve this answer
Does it matter on which port is use to connect router and which port is use to connect PC? – huahsin68 Feb 14 '15 at 8:40
usually not. only,when there is VLAN setup – Farhan Feb 15 '15 at 14:19

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.