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====================================
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Gateways and monitoring
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The address you are trying to monitor should be reachable using the interface the gateway is attached to, either
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directly or using a static route (check :menuselection:`System --> Routes --> Status`).
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dpinger:.. sendto error: XXX
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---------------------------------
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Usually found in :menuselection:`System --> Log Files --> General`, every code has a meaning, usually explained in
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`errno.h <https://github.com/opnsense/src/blob/master/sys/sys/errno.h>`__ (:code:`man errno`)
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Some common ones are explained in the :ref:`errno` section.
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------------------------------------------
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arpresolve: can't allocate llinfo for..
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------------------------------------------
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This message usually means that the configured gateway lies outside the configured subnets for this firewall (for IPv4).
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.. Tip::
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Double check the subnets of your interface and virtual IP's, you can also use :menuselection:`Interfaces --> Overview`
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for a quick list of all configured addresses.
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