I want to be able to do an arping from an Extreme switch


Userlevel 4
To find duplicate ip adressen in a network using arping -b.

4 replies

Userlevel 4
There is a feature Duplicate address detection in EXOS.
Also Garp protection can help find duplicate ip.
In More shell level dmesg -c can clearly tell you the duplicate ip.
Userlevel 4
Duplicate address detection (DAD) is only to see if the ipaddress configured on the switch is in use on an attached network.

I want to check if an ipaddress in the network is used by two devices
Userlevel 6
Johan,

I don't think there is a easy way to detect duplicate end device addresses. You can create a script that grabs the show iparp output from time to time to see if the MAC's change for a specific IP then hunt down the MAC's.

You can also help prevent duplicate addresses by using DHCP snooping with Source IP Lockdown, if your using DHCP in this part of the network.
Userlevel 4
Stephen Williams wrote:

Johan,

I don't think there is a easy way to detect duplicate end device addresses. You can create a script that grabs the show iparp output from time to time to see if the MAC's change for a specific IP then hunt down the MAC's.

You can also help prevent duplicate addresses by using DHCP snooping with Source IP Lockdown, if your using DHCP in this part of the network.

in lunux you have the command arping with the option -b . This option will keep broadcasting the ping and don't swtich to unicast.

so you can find the mac addresses with the same ip addressen.

it must be possible to implement this in XOS.

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