ADSL goes down....

Hello there i have a network that consist of 5 pc´s that are connected as a workgroup.

The problem is that the internett connection stops working.

There is nothing wrong with the adsl line. That has been thoroughly checked. Rule that out.
The modem ZyXEL Prestige 650R-T3(functions as dhcp server)i has been replaced and that did not help.

It is only the internet line that goes down the lan works fine, (the dsl light is always bright light)

Could there be a cable break somewhere that could cause the internett connection to go down?
That should affect the whole network right?

Could the line be under attack?  

(They report that they are able to get small amount of information but when it comes to large amounts of
information it seems to halt) i have not seen this myself.

Could it be a solution to implement a pix firewall?

Anything......
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daxa78Asked:
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Fatal_ExceptionSystems EngineerCommented:
ADSL is not by itself an 'always on' type of connection.  Check the settings in the router (you are using a router, yes?) and see if you can find a 'Keep Alive' setting.  
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Fatal_ExceptionSystems EngineerCommented:
BTW:  you should always have a perimeter firewall setup on any LAN..  This could be a PIX, but if you are not familiar with the Cisco IOS, then it is probably not for you.  Any good Router usually has an SPI firewall built into it these days.  Good consumer grade routers include Linksys (owned by Cisco) and Netgear, although in a commercial environment, I would suggest Netgear products.  SPI stands for Stateful Packet Inspection, and is the prevailing type of firewall available now.
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daxa78Author Commented:
keep alive is enabled :-) it is ppoe connection
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CarlWarnerCommented:
Is there a Redial Period (sec.) with that "Keep Alive" setting?

In my LinkSys router, rather than "Keep Alive", I chose "Connect on Demand" with a Max Idle Time of 0 min.
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Fatal_ExceptionSystems EngineerCommented:
Actually, my backup DSL connection does the same using PPPoE..  It will drop the connection then re-establish itself moments later...  Of course I don't worry much about it since it is used only for redundancy..

Other problem with DSL occur from interference..  feel free to ck out the list here:

http://65.24.134.81/KipSolutions/DSL_Interference/DSLTroubleShooting.htm
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daxa78Author Commented:
Could there be a cable break somewhere that could cause the internett connection to go down?
That should affect the whole network right??
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Fatal_ExceptionSystems EngineerCommented:
The cable break would have to be between the internal router and the first router on the WAN side of the modem..  Very doubtful..
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stevenlewisCommented:
when it goes down, try running tracert to see where the hops are dropped
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daxa78Author Commented:
I installed a Netscreen XP device and it worked great.

Thanks for the input
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Fatal_ExceptionSystems EngineerCommented:
Very good..  glad you got it, and thanks for the tip..

FE
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Fatal_ExceptionSystems EngineerCommented:
BTW:  which Netscreen product did you choose to use?
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daxa78Author Commented:
Im sorry i dont know what to do. I answered the question my self.
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Fatal_ExceptionSystems EngineerCommented:
No objections to refunding those points...

Wishing you a Happy Holiday Season!

FE
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moduloCommented:
PAQed with points refunded (500)

modulo
Community Support Moderator
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