IP conflict detected by router, but on broadcast address (.255). What does this mean?

Hi,
We have a user who has developed a network problem. Their original complaint was that at times suddenly their laptop would drop off wireless.
A computer in another room was OK and sometimes they would take their laptop into another room served by another wireless access point and it would come back online.

On the network itself, if you run a continuous ping, there are quite a few dropped packets and slow response times.  This is not the case if you detach the router from the switch and hook up to the router directly.

We have a Draytek 2830 router in this case, and one thing of note was that in the DHCP table it reports conlflicted IP address, however on the broadcast address.

For example,
It has a few entires,
192.168.1.255  [MAC ADDRESS] CONCFLICTED IP
192.168.1.0 [MAC ADDRESS] CONCFLICTED IP
192.168.1.1 [MAC ADDRESS] CONCFLICTED IP

The thing is, it’s saying there are conflicted IP’s on what I understand to be the broadcast address.
What does this mean in the real world? Is there another DHCP server on the network or something?
afflik1923Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

LibipappachenCommented:
Hi,

Seems to be the DHCP configuration put the entire rage of 192.168.1.0 subnet in to the pool.!

for clarification, can we have the DHCP pool running configuration?  


BR,
Libi
0
Craig BeckCommented:
What's the IP address and subnet mask of the LAN on the Draytek router?
0
afflik1923Author Commented:
The IP address of the router is: 192.168.1.1 (one of the ones reported in conflict).
However, we think the CONFLICT issue may be a red herring as the firmware is from 2010 so we are going onsite to update this.

I did not really understand the previous question
"can we have the DHCP pool running configuration"

Thanks so far and will keep updated.
0
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

giltjrCommented:
He wants to see the DHCP pool definition.  More specifically what is your network mask.

An IP network's broadcast address is based on the mask mask.  Example:

If you have 92.168.1.0/24 the broadcast address would be 192.168.1.255.

However say you setup 192.168.1.0/22, then 192.168.1.255 would be a valid IP address and the broadcast address for the network would be 192.168.3.255 with an IP address range of 192.168.0.1-192.168.3.254.
0
afflik1923Author Commented:
OK well in this network it uses the standard DHCP subnet for a DRaytek and many other routers so is

255.255.255.0

Since upgrading the firmware, it not longer mentions the IP Conflict, so it may have been a simple one on that specific issue.
however there are still signs of network issues based on that when you run a continuous ping to google.co.uk, packets are dropped and some take a long time to response.

But at least we will analyse the problem with the switches and router having the latest firmware.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
masnrockCommented:
You provided the subnet mask... we're looking for the range of IP addresses that can be assigned out by DHCP.
0
afflik1923Author Commented:
Thanks for all the input on this. In the end it seems the issue was down to a required firmware upgrade.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Network Analysis

From novice to tech pro — start learning today.