Netwokr very slow

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Jun 7th, 2008
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Hi,


I have five switches connected with one Cisco 1751 router and have 2 Mbps line. i am getting very high ping response and so my network working very slow. i am facing this problem since last five days. my normal ping response was 15 to 25 ms but now i am getting 450 to 500 ms ping response. can anybody help me or guide me............pls very urgent


if u have any groups or facility with whom i can directly chat online than it would be better for me...pls tell me

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Sushil Kumar Katre Sat, 06/07/2008 - 09:42
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Hi Chirag,


try interacting with Cisco Partner Help Online -


www.cisco.com/go/ph -> "Presales Technical Support"


They have a live chat option as well.


All the best!!!


-> Sushil

Justin Brenton Sat, 06/07/2008 - 13:23
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Is this happening throughout your whole network?


Try to isolate the problem to a specific piece of hardware, do some packet sniffing, have anything changed on your network?


HTH, Please rate


Thanks

Justin Brenton

chiragvyas_50 Sun, 06/08/2008 - 21:24
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As we have done lots of R&D, we come to conclusion that one of our PC in LAN(110 PC) flooding and consuming lots of bandwidth withing my network.


So if you have any software using which i can trace PCs which are using high bandwidth or flooding brodcast then pls provide me link of software.


I think may some of the PCs are affected with virus/spyware but i cant trace which one affected so if you have any software then pls provide me

Justin Brenton Sun, 06/08/2008 - 23:59
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Hi chiraqvyas,


You can download wireshark to capture traffic, I would suggest mirroring ports.


Port mirroring is used on a network switch to send a copy of all network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port. This is commonly used for network appliances that require monitoring of network traffic, such as an intrusion-detection system. Port mirroring on a Cisco Systems switch is generally referred to as Switched Port Analyzer (SPAN); some other vendors have other names for it, such as Roving Analysis Port (RAP) on 3Com switches.


An example of a SPAN configuration on a Cisco 2950 Switch is below.


Monitor session 1 source interface fastethernet 0/1, 0/2, 0/3

Monitor session 1 destination interface fastethernet 0/4 encap ingress vlan 1


The above example mirrors data from ports 0/1, 0/2 and 0/3 to the destination port 0/4 using vlan1 for vlan tagging.



To show the status of a SPAN monitor session use the following command.


show monitor session 1


Where 1 is the session number from the above statement.


http://www.cisco.com/warp/public/473/41.html


Hope this helps.


Please rate.


Regards,

Justin

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