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Forum Discussion

mac_mat's avatar
mac_mat
Aspirant
Nov 21, 2020

GS108Tv3 - adding a static ARP entry - Error: Failed to Add ARP entry. IP subnet does not exist.

Hi All, recently I bought a GS108Tv3, which I use with default factory settings, just to connect my router/NAS/PCs on a local network. My NAS (with static IP) is set to Wake on Unicast, so whenever a PC on the network tries to reach the NAS, it will switch on. Only precondition is that each PC needs a static ARP-entry of the NAS. This all works fine.

Now, instead of having an ARP-entry of the NAS on each of the PCs, I figured maybe I can add a static ARP-entry to the GS108T instead. (I don't know if that would work, but I just wanted to try.) When adding the static ARP, eg with IP 192.168.0.3 and MAC, I just get an error:

 

Error: Failed to Add ARP entry. IP subnet does not exist.
 
What am I missing? Like mentioned; I didn't change any other settings, just the factory default, except I tried switching on the routing mode. Do I need to set up a VLAN or Routing to be able to add an entry to the ARP-table?
 
Regards, mac_mat
 

4 Replies

  • schumaku's avatar
    schumaku
    Guru - Experienced User

    While this ARP entry would not help for the intended purpose - this reads like a bug on the switch.

  • DaneA's avatar
    DaneA
    NETGEAR Employee Retired

    mac_mat,

     

    As indicated in page 265 of the GS108Tv3 user manual here, it says that in the IP Address field, you must enter the IP address of a device on a subnet attached to one of the switch's existing routing interfaces.  Regarding this, is the IP address that you entered is on a subnet attached to one of the switch's existing routing interfaces? 

     

    What is the current firmware version of the GS108Tv3?  

     

     

    Regards,

     

    DaneA

    NETGEAR Community Team

    • schumaku's avatar
      schumaku
      Guru - Experienced User

      Valid point DaneA !

       


      DaneA wrote:

      ... it says that in the IP Address field, you must enter the IP address of a device on a subnet attached to one of the switch's existing routing interfaces. ...


      In other words: The ARP entry can only be added in combination with L3 inter-VLAN routing enabled. Re-thinking it, this does make some sense. At the same time it's confusing, because the switch core IP stack and the NAS are (in many basic network environments) on the very same VlAN and subnet. 

      • mac_mat's avatar
        mac_mat
        Aspirant

        Hi Everybody,

         

        Thanks for the answers, I'll give it a try a soon.

        As I'm a complete newbie to setting up VLANs, I'll probably need some time to 'study'. :-)

         

        regards,

         

        mac_mat

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