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cargex

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Network droping packets

Hi Guys,
My network was working fine, for instance pings to servers were not drop and under 1ms.
All of the sudden in a ping to a server in my LAN I'm seeing huge delays, for instance "time=152ms"

I have 3 main VLANs namely
VLAN 1: For all my users
VLAN 20: For VoIP
VLAN 50: For some video recording security cameras and server
VLAN 88: For all my servers. (The servers are in a VMware Cluster).

These are my tests using a host in VLAN 1: (10.10.70.53)

ping 10.10.70.4
Reply from 10.10.70.4: bytes=32 time<1ms TTL=64
As a matter of fact any IP in this VLAN is under 1ms.

ping 10.10.88.10
Reply from 10.10.88.10: bytes=32 time=149ms TTL=63

ping 10.10.50.10
Reply from 10.10.50.10: bytes=32 time=150ms TTL=127

I just tested and the ping times are back to <1ms for everything.
As far as I can tell this lasted for about 1 hour.

My Opinion:
It looks as if there is a program in a computer somewhere generating absurd quantities of traffic in the network.

My Question:
If I'm right How can I identify the culprit?

One weird thing though is why there was no delay while pinging inside the VLAN 1?

Thanking you in advance,
Cargex
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Bryant Schaper
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I would suspect your router/layer 3 switch that is handling the inter-vlan traffic.  What kind of device is this?  We can maybe isolate the traffic source,
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cargex

ASKER

It is a Cisco 3750 Stack.
I was asking around and I think I found the culprit, it was a Video Editor that was saving his work as he was making changes in a network folder.

But I would like pretty much to know what tools can I use to identify a computer that is creating excessive traffic in a LAN.

This time I was lucky but in the future I would like to be able to pinpoint the culprit without the asking around part.
ASKER CERTIFIED SOLUTION
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Bryant Schaper
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ASKER

Thank you very much Bryant, your information is really helpful.