Permanent ARP entry failed

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Permanent ARP entry failed







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This has happened twice now and I'd really like to know why and how to prevent it.



In our OpenWRT router, I add a permanent ARP entry on startup like so:
ip neigh add 192.168.0.254 lladdr ff:ff:ff:ff:ff:ff nud permanent dev br-lan



This works fine, but after some time (months), the entry becomes FAILED. If I now do ip neigh, the entry looks like this: 192.168.0.254 dev br-lan FAILED



It was my understanding that this shouldn't happen to permanent entries, but it somehow does. Why is this happening and how can I prevent it?










share|improve this question




























    0















    This has happened twice now and I'd really like to know why and how to prevent it.



    In our OpenWRT router, I add a permanent ARP entry on startup like so:
    ip neigh add 192.168.0.254 lladdr ff:ff:ff:ff:ff:ff nud permanent dev br-lan



    This works fine, but after some time (months), the entry becomes FAILED. If I now do ip neigh, the entry looks like this: 192.168.0.254 dev br-lan FAILED



    It was my understanding that this shouldn't happen to permanent entries, but it somehow does. Why is this happening and how can I prevent it?










    share|improve this question
























      0












      0








      0


      1






      This has happened twice now and I'd really like to know why and how to prevent it.



      In our OpenWRT router, I add a permanent ARP entry on startup like so:
      ip neigh add 192.168.0.254 lladdr ff:ff:ff:ff:ff:ff nud permanent dev br-lan



      This works fine, but after some time (months), the entry becomes FAILED. If I now do ip neigh, the entry looks like this: 192.168.0.254 dev br-lan FAILED



      It was my understanding that this shouldn't happen to permanent entries, but it somehow does. Why is this happening and how can I prevent it?










      share|improve this question














      This has happened twice now and I'd really like to know why and how to prevent it.



      In our OpenWRT router, I add a permanent ARP entry on startup like so:
      ip neigh add 192.168.0.254 lladdr ff:ff:ff:ff:ff:ff nud permanent dev br-lan



      This works fine, but after some time (months), the entry becomes FAILED. If I now do ip neigh, the entry looks like this: 192.168.0.254 dev br-lan FAILED



      It was my understanding that this shouldn't happen to permanent entries, but it somehow does. Why is this happening and how can I prevent it?







      linux arp openwrt iproute2






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked May 31 at 9:29









      XandarosXandaros

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