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Collision detection in my WAN

There is a few time, my ISP told me that he noticed thath there are lot off collision in my wan network. As i see the cacti graph, every thing is fine in the bandwith. Some time, there are some pic but i identife the clients who are responsible.but the traffic is allowed. So i need help to how can i know that there are lot of collision. Is there a network monitor witch can help me ?
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1 Solution
Look at the interface(s) of the router for CRC or input ouput erros

Link to management software list

beke_josueAuthor Commented:
i have a cisco asa 5510, can you explain me the step ?
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If ethernet hand off, check the WAN interface, are you running full duplex?  If yes, i would have the ISP check their hand off for half duplex.  A fiber to copper transceiver could also not negotiate properly and negotiate to half duplex.
beke_josueAuthor Commented:
See below the show interface commande for my routeur. Can you confirme that there is not collision? Or can you give me an explicit interpretation?
Interface Ethernet0/0 "x", is up, line protocol is up
  Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec
      Auto-Duplex(Full-duplex), Auto-Speed(1000 Mbps)
      MAC address 0023.5e25.4612, MTU 1500
      IP address 172.x.x.x, subnet mask x.x.x.x
      9070802038 packets input, 11664249371572 bytes, 0 no buffer
      Received 5 broadcasts, 0 runts, 0 giants
      11 input errors, 0 CRC, 0 frame, 11 overrun, 0 ignored, 0 abort
      0 L2 decode drops
      7863652186 packets output, 3158970316258 bytes, 0 underruns
      0 output errors, 0 collisions, 0 interface resets
      0 babbles, 0 late collisions, 0 deferred
      0 lost carrier, 0 no carrier
      input queue (curr/max packets): hardware (1/33) software (0/0)
      output queue (curr/max packets): hardware (0/84) software (0/0)
  Traffic Statistics for "MTL-INT":
      9070800587 packets input, 11498391870738 bytes
      7863652186 packets output, 2993833563110 bytes
      245673 packets dropped
      1 minute input rate 375 pkts/sec,  41602 bytes/sec
      1 minute output rate 1456 pkts/sec,  874366 bytes/sec
      1 minute drop rate, 0 pkts/sec
      5 minute input rate 415 pkts/sec,  65137 bytes/sec
      5 minute output rate 1457 pkts/sec,  843084 bytes/sec
      5 minute drop rate, 0 pkts/sec
Nothing out of the ordinary.  Since you are charting bandwidth and have snmp set up, you could use a SNMP monitor to record interface errors, etc.   Try paessler.com but there are many more out there.

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