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Network and Classroom Management Thread, Network in Technical; trying find the location of an ip address that is connected to a switch any good quick tools as for ...
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    kevin_lane's Avatar
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    Network

    trying find the location of an ip address that is connected to a switch

    any good quick tools as for some reason its mostly the cause of my network issue this morning

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    ARP to get the mac
    Query the mac table on the switch to get the port.

  3. 2 Thanks to psydii:

    jpaterson (21st March 2014), mac_shinobi (21st March 2014)

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    kevin_lane's Avatar
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    10.25.15.255 ff-ff-ff-ff-ff-ff this is strange because our dhcp scope only goes upto 10.25.14.254 and we have nothing that is going to be broadcasting that address

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    That's the broadcast address.. Not a device.

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    Quote Originally Posted by psydii View Post
    That's the broadcast address.. Not a device.
    Just to confirm - how do you use the ARP command to establish the mac address of the device etc ?

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    kevin_lane's Avatar
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    I thought they started from 172

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    If it is causing show stopping issues...

    Unplug half the ports and see if thee problem goes away.

    If it remains, unplug half Again.

    If it has gone... Reconnect half the cables, rinse and repeat until you isolate the port connected to te device sending the broadcasts.

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    If I understand you right... I think Lantopolog should work

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    kevin_lane's Avatar
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    don't really want have to start unplugging

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    From a device in the same broadcast domain, ping the offending IP, then

    Arp -c to get a list of mac:ip

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    mac_shinobi (21st March 2014)

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    Quote Originally Posted by kevin_lane View Post
    don't really want have to start unplugging
    It is the fastest way. And if the network is dead or close to dead in the water, it is also the best way.

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    kevin_lane (21st March 2014)

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    Just occurred to me, if you are confident at a switch command line, you could just shut the ports down... Which would be quicker and tidier, and do-able remotely.

    (Didn't have the luxury of that feature last time I had to use this technique!)

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    Mark182's Avatar
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    If I understand this right you could nbtstat –a the IP address find the name of device? Or try show interface brief on the router?

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    kevin_lane's Avatar
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    yea I tried the nbtstat but wouldn't show anything

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    Try NSLOOKUP ?



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