network question!!! ( 4 Views )

1. Get this... everytime a set of computers hooked up to a 5 port switch (brand new) go online it kicks the entire rest of the building off. To bring the rest of the building back online I have unplug the router and 24 port switch and plug them back in. What could possible be causing one area to throw the entire network offline???
   
   
   (abdullah, Iraq)


2. Switching loop? (as in switch 1 is connected to switch 2, and switch 2 has a second connection to switch 1, which causes packets to be passed back and forth forever)
   
   
   (SEHER, Madagascar)


3. Could you give a bit more information about the layout of the network and how the devices are hooked together?
   
   
   (ciwan, Croatia)


4. Quote:

   Originally Posted by Fint Switching loop? (as in switch 1 is connected to switch 2, and switch 2 has a second connection to switch 1, which causes packets to be passed back and forth forever)

   With the limited info given, this is the first thing I'd look for.
   
   I had a customer once with both wired and wireless on her laptop. Both wired and wireless were on the same subnet. For some reason she decided to enable bridging on the interfaces. This caused a loop that cause all traffic on the network to basically stop because of the flood of packets.
   
   
   (esra, Gibraltar)


5. ws
    
   Well I do have wireless routers connected, but there is nothing bridging them to the switches or main router connection. The wireless is meant as a supplemental access.
   
   
   (ERBAY, Aruba)


6. If the new devices already have assigned addresses before they're plugged in that conflict with numbers you already have, it can cause similar problems.
   
   (Overlapping DHCP servers will do it too. It seems that every silly switch, bidge or router now comes with it's own DHCP server.)
   
   
   (ask, Moldova, Republic of)


7. Quote:

   Originally Posted by skadrum Well I do have wireless routers connected, but there is nothing bridging them to the switches or main router connection. The wireless is meant as a supplemental access.

   Windows XP has the option to bridge two interfaces. The problem I ran into was that a client machine (laptop) had two interfaces that were bridged. When both were in use, the loop was created. Check to make sure that this isn't the case. You might be able to use Ethereal to see if you problem is a flood of packets. You can also see where that flood would be coming from.
   
   
   (ahmet, Uruguay)


8. dhcp
    
   Ok for some reason the main router's dhcp was enabled when the entire network is static ips including the wireless routers which throw out dynamic ip's to the wireless segments. think this will fix it??
   
   
   (yusuf, Zimbabwe)


9. Quote:

   Originally Posted by skadrum Ok for some reason the main router's dhcp was enabled when the entire network is static ips including the wireless routers which throw out dynamic ip's to the wireless segments. think this will fix it??

   Unless you have a specific reason for having the wireless routers give out their own addresses, I'd avoid doing that. You probably want all the devices to be the on the same network.
   
   
   (ibrahim eren, Albania)


10. ws
     
    yes, actually i do. I want them to be a separate network so that visitors have automatic access to the Internet but no way of accessing the school network.
    
    
    (Kurtuluþ, Nicaragua)

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