Internet Access over LAN blocked but connectd

September 16, 2011 at 22:47:49
Specs: Windows XP, 2 GB
Dear friends
I have a problem with my LAN. We are having a workgroup of 12 Pc connected using a switch (hub) having all Windows XP SP2 and some of them registered Kayspersky antivirus 2011. We have internet access using D-Link 2460T (DSL wireless ADSL router) connected to our LAN using a network wire and having DHCP enabled. Everything was working well for 4-5 years but recently a problem appeared.
All PCs get disconnected from LAN, Network connection logo get a warning of limited access, and none of the clients can ping to ADSL router (192.168.1.1). But on the other hand, the ADSL router / switch show connected to LAN & DSL (both light remain green). If I put one of the reserved IP to any PC, that PC get connected & warning messege goes and that PC can even Ping 192.168.1.1 router but still the internet access is not available (even by putting DNS as internet gateway & alternate DNS as 192.168.1.1).
Another point to be noted is, when I restart the router by removing power of the router, all PCs again get connected and internet works. Then again after 4-5minutes same problem re-occurs.
What I think is some of the PCs (having antivirus as well) are blocking internet network port of the router. As (if I put other PCs off) my PC is not having any antivirus and work hours & hours without disconnection.
Any suggestions, support or solution to this kind of problem? Please do write me at sohail_sagar at yahoo . com
Thank you,
Sohail Rasheed

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#1
September 17, 2011 at 02:50:28
Could be that in a P2P workgroup windows only supports a maximum 10 connections and you have 12 so there may be some conflict arising.

Goin' Fishin' (Some day)


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#2
September 18, 2011 at 00:07:55
Its not, sometime we have less computers working but it disconnects. Even I have disabled network connections of some PCs but still the problem is same.

Another thing is that After restarting all works well, and after 5minutes (and before complete disconnection of lan) router page (192.168.1.1) can not be accessible while we can ping to this ip and internet still works. and then after 5-10minutes internet / LAN completely get disconnected to described state.


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#3
September 18, 2011 at 02:16:39
I would suspect the router is faulty.

Goin' Fishin' (Some day)


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Related Solutions

#4
September 18, 2011 at 02:55:52
but how come it works well for 4-6 PCs. Is it because any PC or cell phone (wireless receiver) have any kind of virus which block the internet port?

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#5
September 19, 2011 at 06:46:40
Try to reset the router.
If you not succeed, then it could be the frequency of the router.
Try to change it to something else.

If it's still not working, buy a new router.

Regards,

Happy is ONE who says I am an OttoMAN.


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#6
September 19, 2011 at 07:25:43
I agree with Richard59.

If recycling power on the router works, but only for a while, the only other thing you can try is updating the firmware on the router if it's not already at the most recent revision.

If updating the firmware doesn't fix the issue, definitely replace the router.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#7
October 6, 2011 at 23:12:05
We have a very similar issue with a network of up to 30 users. We even change ISP's last week when we had the problem and it still re-occurred.

It happens around the same time every Friday. We speculate there is some job that runs or some malware etc. but we cannot locate this.


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#8
October 6, 2011 at 23:30:56
Just to add further. not only have we change the ISP, but we have removed the original ADSL modem (which performed DHCP) and one of the switches

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#9
October 7, 2011 at 07:06:02
eOne

Rather than add on to an existing (finished) post you should be posting your question separately.

Now, go start a fresh post, include pertinent details (for example, make/model of router) and whether or not clients affected are connecting via wired, wireless, or both.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#10
October 7, 2011 at 21:08:25
Well, after trying with a changed/new router, my doubt is more clear about some malware (virus or job that runs) on some of the client PC and block the LAN or may be disabling the DHCP as well. I formatted some of the mostly virus affected PC and now the problem is much better, means still two/three computer have not been formatted. BUT THE LAN or internet works very good now (except rarely disconnection of LAN)

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