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problem adding a new network

Posted on 2008-10-01
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Last Modified: 2010-04-21
Environment- 172.16.81.0/255/255/252.0 is my local network.  Also have a 172.16.82.0/255.255.252.0 network separated by fiber/switches (no routers or vlans).  Everything works very well as we should be good for any address between 172.16.80.1-172.16.83.254.  I wanted to add 172.16.80.0 as a local network but I am getting heartaches.  Ie.  I have a laptop with an 80 address but its connectivity is sporadic.  Sometimes access resources, ping, nslookup, tracert but other times i cannot.  It is totally sporadic.  I  

ipconfig all (Xp Pro box)
ip=172.16.80.21
mask- 255.255.252.0
dns- 172.16.81.242/249
Gateway- 172.16.81.250

I am not going through a firewall and the resources I am trying to hit is local (no routers involved).
Domain user and computer accounts are valid.  Any thoughts on what the potential problems could be?  Perhaps a domain policy?  Anything?  Please help.  :)  
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Question by:itcogf
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Expert Comment

by:MikeKane
ID: 22618539
My first thought is you probably used a 255.255.255.0 instead of a 255.255.252.0 somewhere on the net or your device.    (I've done that myself... you just get so used to typing 255...)  

Your network is just 1 big flat network, probably running on the native VLAN.  
You have the 1 subnet 172.16.80.0/22  

During the error when you can not ping, get an ipconfig /all from the laptop, list the IP you are trying to ping, can you ping any IP?  

Is the laptop on the same switch as the device you are pinging?  

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Author Comment

by:itcogf
ID: 22625488
Hi Mike...and thanks.  I wish it were as simple as a subnet typo.  I have checked all local switches, DHCP, everything.  I have even tried to just ping other devices on local switch but it seems that when I begin pinging devices...then the devices know who I am (via broadcast?) and begin responding.  

Just moments ago I did conduct some nslookups.  DNS Server 1 Timed out.  DNS Sever 2 got NON-EXISTANT DOMAIN.  

Seems the most common reason for getting that 2nd error is not having a reverse lookup...but it is there.  

I feel the need to add one thing here.  A few months ago we did purchase an unmanaged inexpensive gb switch (Netgear JGS524) and some servers and wkstations on it.  The rest of out switches are HP 4000M's.  

All help is greatly appreciated.  Thanks again.
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Accepted Solution

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MikeKane earned 500 total points
ID: 22626827
Sounds like you have a handle on your system.  

Here are some thoughts:
1) Is your laptop the sole device on the switch when this is happening?  If not, are other devices experiencing the same?
2) If your laptop is the only device with this issue, is it managing power to your NIC?   You might turn off power management for testing.  
3) On your switches that are showing odd behavior,  clear arp cache,  or just reset them if possible.  
4) Check the KB of the switch manufacturer for any issues related

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Author Comment

by:itcogf
ID: 22895745
I will award points for effort.  At least you responded.  
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Author Closing Comment

by:itcogf
ID: 31623583
I will award points for effort.  Our problem is a tough one and I figure there is maybe .001% of network Admins who could answer it.  I know I can't.  We are working on our routing and will be buying a fluke analyzer.  Thanks for trying though..
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