Solved

Network not stable, intermittent ping/uptime on servers PC's and Printers

Posted on 2012-04-12
3
913 Views
Last Modified: 2012-04-16
Hi All,

I take care of the PC's/Network for a hotel and have come into a problem i cant quite get my head around,

This morning at about 7 o'clock i received calls saying internet was down, no printers are working, some PC's have no network/drive access etc, I've looked into it and have found the following:

All printers are connected power wise and to the network, I can ping 1-2 of them however the others the first ping replys then the rest dont (even using -t switch) If i leave it for 5 minutes then ping again i get the same thing, one reply then nothing.

When pinging servers/PC's the majority will ping all 4 back no problem but some ping in the following way:
1st replies
2nd timeout
3rd replies
4th replies
following this, if you ping again all 4 will reply, however leave for 5 minutes and ping again and you get the same issue

Some ping in the same manner as the printers where the first will reply and then none after that.

All pings that do reply are =1ms or there about.

There are fiber connections between parts of the hotel and i've known fiber previously to either work fine or fail completely so I have ruled this out for the moment.

I've seen this issue before in other networks and usually points to a small switch being used on the network somewhere causing the issue however I have covered the whole site unplugging any small switch one by one and testing stability without any answers.

Windows Firewall is off network wide, have also tested by turning off all of our AV/Firewall software without any luck.

I have replaced major switches one by one, monitored and same issues occur.

I have replaced a series of network cables throughout the hotel also

to add - Domain Controller is Server 2003 Enterprise - and currently will not show up windows explorer just a blank screen however when RDP'd into everything is fine all services running etc

Please ask for anymore information about the issue, I have looked at it from pretty much every angle so should be able to answer any questions.

Any help would be greatly appreciated,

Cheers,
Pete
0
Comment
Question by:pd_
3 Comments
 
LVL 1

Expert Comment

by:hdmiller
ID: 37839440
You try pinging the loopback on the DC?  Maybe NIC failing.
0
 
LVL 17

Accepted Solution

by:
TimotiSt earned 500 total points
ID: 37841426
First guesses:

- rogue DHCP server on network,
- failing NIC with ARP issues,
- rogue Netbios subnet master browser (should mess up everything referred by name, but work fine with IP addresses),
- user PC running some worm or something.

If you have decent switches, you could implement: DHCP snooping, ARP protection, source IP protection, broadcast/multicast storm control.

Tamas
0
 

Author Closing Comment

by:pd_
ID: 37850537
Hi There,

Turned out a member of staff had patched the guest network into our office network at some point which like you said meant there was two DHCP servers on the same network conflicting,

Cheers for the help,

Pete
0

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Trasfering FSMO roles 8 96
ethernet cat5e lenght 80m 9 58
Mac-address sticky 12 46
fibre channel switch - sfp needed? 2 20
Scenerio: You have a server running Server 2003 and have applied a retail pack of Terminal Server Licenses.  You want to change servers or your server has crashed and you need to reapply the Terminal Server Licenses. When you enter the 16-digit lic…
Restoring deleted objects in Active Directory has been a standard feature in Active Directory for many years, yet some admins may not know what is available.
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now