Pretty strange problem in my network

5 pts.
Tags:
ADSL
DSL
IP
Network
Network collision
Network connectivity
Network design
Switches
Hi Everyone, I have a client who has 10 computers . He also have 10 ADSL connections for internet connectivity (all from single ISP). We want to setup the environment in the following way: we have 2 D-Link simple switches with 24 ports. What we wanted to do is to connect all ADSL modems to one switch and connect all PC's to the other switch. and then connect both of switches in such a way that that they all can communicate with each other and we also want to put every computer on different ADSL modem. i.e. 1st computer :----- IP address 192.168.1.101 subnet mask 255.255.255.0 Gateway 192.168.1.1 (This is the ip address of 1st ADSL Modem) DNS 192.168.1.1 2nd computer :----- IP address 192.168.2.102 subnet mask 255.255.255.0 Gateway 192.168.2.1 (This is the ip address of 2nd ADSL Modem) DNS 192.168.2.1 3rd computer :----- IP address 192.168.3.103 subnet mask 255.255.255.0 Gateway 192.168.3.1 (This is the ip address of 3rd ADSL Modem) DNS 192.168.3.1 and so on up to 10 computers. Up to 4 computers work perfectly in this configuration and can ping google & yahoo without any time out. but when ever we start 5th ADSL modem for 5th computer then the time outs started to appear on other pc's randomly . and the lights on the switches started blinking very fast. what i thought is that this is all due to collision in the network. For interconnectivity of all computers we will add additional IP's in the network properties of every computer. so i want to know that how to implement this solution for my network. this is very urgent for me to do. Kindly answer this ASAP. p.s. If any one needed any further information then kindly ask.

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I suspect that there is a lot of broadcast traffic on this network. It’s not necessarily collisions but each machine has to listen to all broadcasts on the network. The broadcasts are likely routing updates from the DSL modems. See if you can disable routing updates on the LAN side of these modems. Your next option is to subnet the network into multiple subnets and use a managed switch as a backbone router rather than going to the individual DSL modems. Another thing to confirm is if DHCP is enabled on the DSL modems. This could confuse network devices pretty quickly if there are multiple DHCP servers on a LAN.

Can you also explain why you have 10 DSL connections rather than a single T1 or similar link? It seems like the 10 connections may be more expensive and require more management time than a single link for these users.

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  • Bobkberg
    Yes...This IS a strange configuration. . Can you explain WHY the customer wants 10 separate ADSL accounts? I could speculate wildly, but none of them make particular sense - especially since your other comments indicate that they're all physically close to each other. . One other thing you might look at is the Spanning Tree configuration - I'd consider that before I'd consider routing - but it's still broadcasts that are quite likely - OR - crossed wires. . If it's aggregate bandwidth or load balancing you are seeking, you might be better off with higher capacity circuits and run them through a load balancing router such as Linksys makes. If you go with more commercial gear ( like Cisco, Nortel, Juniper, etc.) you should be able to do this better. . Please write back with more details, . Bob
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