Dynamips/GNS3, .net files, and Cisco networking labs.
alizai77
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Class A ip & Loopback problem

Thu Feb 26, 2015 2:25 am

Dear friends,
i m new to GNS3 but i know a bit that how it works, well i am preparing simple lab. using Class A IPs
i.e
R1# ip add 1.1.1.1 255.255.255.0
R2# ip add 2.1.1.1 255.255.255.0

but it does not work using C3745 routers
only Class C is acceptable. what is the reason?

and also tell me about loop back ? if i want to connect R1, R2, and R3. then how can i do that plz help me out

thanx
Naveed

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