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Cisco 2800 - setting both ethernet ports to 10.0.0.x - Easy Points!

Very simple question. I am consolidating two cisco routers (a 2800 and a 1720). I already configured the Serial Port on the 2800 (the 1720 is going out of production), and that works, but when I try to set the OTHER gigabitE0/1 port, to 10.0.0.4, it says that 10.0.0.0 is already in use on GigabitE0/0 (GigabitE0/0 is 10.0.0.12). Is there anyway I can assign two different IPs to the two interfaces, but have those IPs in the same subnet?

the command I use is of course in interface config:

ip address 10.0.0.4 255.255.255.0

The reason why I need this, is because the 1720 used to have E0 be 10.0.0.4 and I need to have that same IP number 'answer' on the 2800 when clients that are configured to use that IP for their default gateway need to go outside the LAN.

Thanks in advance!

Kaleb
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talkingbob
Asked:
talkingbob
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1 Solution
 
Don JohnstonInstructorCommented:
10.0.0.4/24 and 10.0.0.12/24 are on the same network.

You cannot have two interfaces of a router on the same network.
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talkingbobAuthor Commented:
Don,

I was afraid that was the answer, it's just that reconfiguring IPs on several devices vs. just on the router is much more difficult and disruptive.

At this point you would just leave one of the interfaces at .12 or .4 and then reconfigure nodes as needed?

thanks.

K
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Don JohnstonInstructorCommented:
It's hard to say what the best course of action is without knowing the current or proposed topology. Can you provide additional information?
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mikebernhardtCommented:
What is the purpose of the Gig0/0 addressed with 10.0.0.12? Why does it need to be in the same subnet as Gig0/1?
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pjtemplinCommented:
Don't hook up the second port.

Put "standby 1 ip 10.0.0.4" on the first port's config.

Done.
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talkingbobAuthor Commented:
I will try the standby command when I get a chance.

Sorry for the wait guys, but I won't abondon this question - someone is getting points!


Kaleb
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talkingbobAuthor Commented:
PJTEMPLIN:

When you said "the first port's config", does that mean the same interface as the one that current has 10.0.0.12 (gigabitethernet0/0)?
Do I leave the other interface set to no ip address or does the standby command go on interface gigabitethernet 0/1 (which has no IP currently?

Thanks


Kaleb
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pjtemplinCommented:
Pick a GE port, let's say G0/0.

Give it an IP address.  Let's say 10.0.0.4 255.255.255.0.
Give it a standby address.  Let's say 10.0.0.12.

On the other GE port, do "no ip address".

Happy.
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talkingbobAuthor Commented:
I'm doing this live and wanted to get rid of any possible confusion on my part.

Thank you.

Happy.
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talkingbobAuthor Commented:
Thank you pjtemplin, for your great insight. It worked just like I wanted!

Thanks again!
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