Major problems! Internet down, but can ping! WTF!

[Winchester]

I am trying to get our internet back up full time.

Diag= Internet <->DSL modem / 8prt router <-> Router <-> 4 Switches <-> 100+ Computers

I have this computer connected to the back of the DSL Modem/Router and I am able to continuiously ping an outside IP address between 4 and 16ms (this morning is was almost all 4ms, now it is getting up into the 20s-200s sometimes, when it is just me and the cable modem, even when the internet is not working (IExplorer). This occurs even when I disconnect everything but me from the modem. The internet will work sometimes for up to 20 minutes and then cut off, even when I never change a thing.

I noticed two servers that had the nachi.worm this morning, but have ran stinger program to remove it from them. Now the file server and email server work fine when I am connected to them. (they were slow until I ran the stinger program)

Our DSL company says it is a computer on our network, since I am able to ping outside, so that it is our problem and they cant help. They said supposedly there is one computer on our network taking up all the network resources. I have yet to find it if so. (are there any programs that I can use to tell which computer on the network is doing this, so I can isolate it?) I would believe the DSL company a lot more if the internet would work 100% of the time when it was just ( computer <-> DSL modem <-> internet) but it doesnt, I am currently in a "window" that I can get on the internet.

When the Internet is up I have went through connecting the switches one by one until the internet quits working, but it works fine with everything connected sometimes, and sometimes not at all.

When the internet is not working, and I click IExplorer, it goes to Website Found, then says "redirecting" for a split second and then just sits looking into space.

The computers should connect directly to the internet when on the network.

EDIT: when I turned off all the switches, routers, and the modem and then turned them back on, everything works for a bit, then off again, not yet though


I need a program that I can use to determine which computer is taking up all the bandwidth, or any other program that might help with this


Can anyone help me?

 

[loup garou]

EDIT: when I turned off all the switches, routers, and the modem and then turned them back on, everything works for a bit, then off again, not yet though

Sounds like a flood of some sort. What sort of virus protection do you have on this network? You need to do a network-wide scan of all computers for viruses/trojans. Also, disable any VPN services that may be running, as someone may be infected at home and connected to this network.

 

[martind1]

youc an examine the packets floating on yoru network see if they are all coming form 1 computer.


even more manual ... turn them all off turn them back on 1 at a time, lol (note, by turn off, you could just disconnect them formt he network/their segments)