Need help with 7 users on DSL connection

We have seven users using a DSL 1.5/512 connection and it dies after the third user. I heard something about sharing DSL in the past that it had issues. Is there a way to bypass this problem with hardware or some settings? We are trying to avoid a T1.

Version DSL. Using the supplied modem/wireless/router.

Any thoughts?
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I've been using Verizon DSL for years at home often with more than 7 clients behind the router. I've always used Linksys's products (e.g. BEFSR81) so I'm not familiar with the router Verizon is providing. Nonetheless, there is no reason why it should die after 3 clients. Could you be more specific about how it dies. Do all users lose access to the Internet. When it dies, can users still ping one another? What does tracert show? What does ipconfig show on each client after it dies?

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victorpbAuthor Commented:
The speed is too slow to use when multiple users get on usually over three.
This sounds extremely odd, a DSL connection with the speeds you specified should have no problem supporting 7 typical users.
I would suspect someone in the environment is using up much more bandwidth then they should.  Look into and Bit Torrent or other file sharing, audio/video streaming, FTP uploads/downloads or other bandwidth heavy tasks.
A good test would be to block all unneccesary ports in your firewall and allow bypass through only the basics such as SMTP(25) web (80,443,8080), POP/IMAP (110/143) any any other that are specific to your applications.  If speeds improve then there are some rogue applications or even possibly malware in your network.
Rob WilliamsCommented:
I agree something is wrong. With a similar ac connection I have supported 75 users. It might be malware, in appropriate use as suggested by Dalamscius, or even more likely there is a problem with the connection. I would recommend having the service provider test and verify all signal strengths, DB ratings, and whatever else they check.
If you can monitor the internet connection using a hub (not a switch) or a switch which allows monitoring a port than sniffing the connection with Wireshark (free widely used sniffer found at will reveal the problem. It might be a bandwidth hog, or it might be something misconfigured which causes a lot of traffic to be sent over the Internet connection. It might also be malware or even one or more of you computers have become drones.
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