nixCraft

dougp23 · #1 (**permalink**) 08-03-2008, 05:56 AM

We run a Cisco-based network, with IP Phones and all that good stuff.

The problem is that twice this month, the phone system has entered a state of "one-way audio". If you call in, you can hear us, but we can't hear you. It is quite frustrating when it happens! Cisco says it is because somehow, someway, some device is trying to use of my router's or phone's IP address...

So I looked at arpping, but that only checks one IP. Obviously when this happens, we need to get the phones back up as quickly as possible...this is usually done with a reboot of the main router.

Is there a way to use arpping that would check all IPs within one subnet?

Thanks.

nixcraft · #2 (**permalink**) 08-03-2008, 02:20 PM

Noop, but you can use shell script or for loop. For example, 192.168.1.0/24 subnet can be tested using following code:

Code:

for i in $(seq 1 254); 
do 
echo "arping -q -D -I eth0 -c 2 192.168.1.${i}"; [ $? -ne 0 ] && echo "192.168.1.${i} duplicate"; 
done

dougp23 · #3 (**permalink**) 08-03-2008, 08:20 PM

Thanks. That looks perfect!!

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Find Duplicate IP Address / Subnet with arping

Find Duplicate IP Address / Subnet with arping

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