GS1900 tagged VLAN nodes drop off after 5 minutes

2»

All Replies

  • SL75
    SL75 Posts: 8  Freshman Member
    First Comment Friend Collector
    edited November 14

    Hi @Zyxel_Judy I did some further tests with your advice

    GS1900-24 uplinked to a live LAN but only hosting test PCs itself.
    In all cases below, the switch MAC table looks correct, it contains all the hosts connected to the switch itself, and those from the rest of the LAN.

    HP and Asus pinging each other
    Untagged: Pings stay up for over 3 hours, I stopped timing after that.
    Port-based VLAN ID2: Pings stay up for over 3 hours, I stopped timing after that also.

    Tagged VLAN ID3: Pings stop after less than 5 minutes. Interestingly, on the most recent test, the Asus stopped responding to HP, but HP continued to respond to Asus.

    This is the HP ARP table before and after Asus stopped responding to ping (but HP continued responding to Asus). The Asus 192.168.0.16 remains in the ARP table.

    C:\Users\5CD0172J00>arp -a
    Interface: 192.168.0.15 --- 0x6  Internet Address      Physical Address      Type
    192.168.0.16          50-46-5d-3f-10-bf     dynamic
    192.168.0.255         ff-ff-ff-ff-ff-ff     static
    224.0.0.22            01-00-5e-00-00-16     static
    224.0.0.113           01-00-5e-00-00-71     static
    224.0.0.251           01-00-5e-00-00-fb     static
    224.0.0.252           01-00-5e-00-00-fc     static
    239.255.255.250       01-00-5e-7f-ff-fa     static

    C:\Users\5CD0172J00>arp -a
    Interface: 192.168.0.15 --- 0x6  Internet Address      Physical Address      Type
    192.168.0.16          50-46-5d-3f-10-bf     dynamic
    192.168.0.255         ff-ff-ff-ff-ff-ff     static
    224.0.0.2             01-00-5e-00-00-02     static
    224.0.0.22            01-00-5e-00-00-16     static
    224.0.0.113           01-00-5e-00-00-71     static
    224.0.0.251           01-00-5e-00-00-fb     static
    224.0.0.252           01-00-5e-00-00-fc     static
    239.255.255.250       01-00-5e-7f-ff-fa     static


    At the other end, this is the Asus ARP table before and after Asus stopped responding to HP (but HP continued responding to Asus). HP 192.168.0.15 disappears from the ARP table.

    C:\Users\Gonzales>arp -a
    Interface: 192.168.0.16 --- 0x12  Internet Address      Physical Address      Type
    192.168.0.15          b0-5c-da-29-96-02     dynamic
    192.168.0.255         ff-ff-ff-ff-ff-ff     static
    224.0.0.22            01-00-5e-00-00-16     static
    224.0.0.251           01-00-5e-00-00-fb     static
    224.0.0.252           01-00-5e-00-00-fc     static

    C:\Users\Gonzales>arp -a
    Interface: 192.168.0.16 --- 0x12  Internet Address      Physical Address      Type
    192.168.0.255         ff-ff-ff-ff-ff-ff     static
    224.0.0.22            01-00-5e-00-00-16     static
    224.0.0.251           01-00-5e-00-00-fb     static
    224.0.0.252           01-00-5e-00-00-fc     static

    I then added a third test PC, a Fujitsu Esprimo desktop 192.168.0.31 - all three test PCs have Realtek network host adapters (although at this point not sure if exactly the same model).

    HP and Fujitsu pinging each other on VLAN ID: 3 stayed up for over 3 hours. ARP tables on both showed each other's IP and MACs.

    Then I added Asus into the test also on VLAN ID 3.
    HP and Asus pinging each other
    Fujitsu and Asus pinging each other

    Pings between HP and Fujitsu continued to stay up, over 5 hours at the last check
    Pings between Asus and the other two dropped after 2 minutes.

    Before the ping drop, all three test PCs had correct ARP tables.After the ping drop, Asus dropped all ARP entries, while HP and Fujitsu retained the entries from each other's peers.

    From this test, I would say I'm satisfied that the ZyXEL switches are performing as they should, and the problem is with Windows on the Asus laptop. It is strange, though, how the pings stay up longer (approximately 1.5 hours) if the switch is isolated from any LAN.

  • PeterUK
    PeterUK Posts: 3,461  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary
    edited November 19

    I would think the Asus has a driver issue for the NIC try new ones 

    Communications Network ICs-通訊網路 ICs

    or try disable ARP offload and see if that helps

    Also there are two driver types NDIS and NetAdapterCx