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Can two legs of a router be configured to be in the same subnet?

I am a newbie in networking and is experimenting with CISCO Packet Tracer 5.0. I found that in Packet Tracer I cannot configure two legs of a router to be in the same subnet. In that software one simply can't configure a network card to be in the same subnet as an already configured card. However, I found that I can configure the two NICs in my PC to be in the same subnet, and can still get through to the Internet. I know that a router loses most of its role if both of its legs are configured to be in the same subnet, but theoretically are there an rules forbiding such practice?

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Yes, the route table won't like the same subnet on two interfaces. I'm not sure if this would work if you didn't have "ip routing" configured... you could try turning off "ip cef" too... but i've never been able to do this on a real router.

Other option on a real router is to put both interfaces in "bridge" mode, or configure the second interface to clone the details from the first... although i've only ever done this with Dialer interfaces before.

So I guess the answer is yes... the router wants to put the route to the subnet in its route table (show ip route) and if you have two interfaces both with the same subnet, the route-path costs would be equal and identical... which is a huge issue in a networking environment.

Your PC doesn't care... it's not really routing. It's quite common to do this with a PC for the purposes of doubling bandwidth, load balancing, or having redundant links. (on the switch you would need to configure a "port-channel" to bond two ports together.)

Cheers!

Posted on Feb 05, 2009

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25880832-z0b4ejwdpu00bf4gywjxw3j2-2-0.png

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That is a very good question, but that would take way more space than this forum offers. A good router tutorial, which covers the configuration from the IOS command-line interface can also be found here.

You should check out Cisco's page on EIGRP (link) or Petri's Blog about configuring EIGRP (link), but if routing protocols are in general a new thing for you, you will be better advised to get a book that covers all protocols, otherwise this might not make any sense to you.
Look for this:
CCNA - Cisco Certified Network Associate Study Guide by Todd Lammle, Publisher: Sybex
You can get it at amazon and it costs you only 20$ (used) or 30$ new including shipping. Here is a link.

If you have specific questions, I'm happy to help, but in the book it's already more than 60 pages on IRGP/EIGRP alone, so I don't really want to type that all up, plus you would need some general information as well.

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