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problem with sharing dsl connection

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by vpgulrajani

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I have a high-speed DSL connection sharing among 50 people in a building and was working fine over a year. Each floor has its own switch with ten users on each floor. There are around 20 users who are online at same time. The connection passes through router and an 8-port switch is connected to the router. The switch on each floor is than connected to that 8-port switch.

The problem: the connection keeps on cutting off every 20-30 mins and works fine after the main switch (8 ports) is restarted. After restarting the switch, it works fine for 20-30 mins and it has to restart again. I changed the main switch and the other switches on the floors and also made sure the wiring is proper. After changing all switches, the same problem started again after 2 months and works fine when the main switch is restarted and this time the connection drops after 10 mins. So i again changed the main switch once the problem started again and now this has become a daily routine.

Tried to solve the problem, but was unable to solve, can someone help or any suggestion .

Thanks,
Vikram.

5 replies

by tduval

I've seen that once. After many many tests, we changed the hub, and now, one year later, we never see that again.

by dynoe

Okay. First, the fact that you use switches and not HUBS (Answer 1) is good so far. It can be a variety of reason; however, the first that come to mind are CRC errors and viruses. CRC errors are errors commited at the router level when it does not route the packets correclty. Have you attempted to change the router? Viruses can kill your router's and switches' buffer (DOS attacks or buffer overloads). Check the client PC's for viruses and for gawd's sake PLEASE make sure you have anti-virus software installed. If you have servers installed on your network, also make sure you are not hosting any viruses. Your server could have been hit with NIMDA (or equivalent).

by cphillips77

Switches flood broadcast frames to all ports except the one on which the frame was recieved. I would ensure than my spanning-tree protocols are enabled to eliminate the possibility of any loops and see if that works. Your router may be bad and if none of that works it could be as simple as a bad NIC...which is painful to find. Good luck.

by hnglide

Since this is an intermittant but recurrant issue, use standard troubleshooting techniques. Remove all possible causes and return them one at a time until you find what is causing the problem. You will obviously need a variation on this as bringing everyone down while you do this is not good for job security. Perhaps take out 2 or 3 floors for half a day and then the others. You may find 2 or more porblems interact to cause the dropout so good luck isolating them!

by colliver

You aren't using Dell Switches by chance are you?
If, so just get them out and replace them.

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