Switches not getting default gateway when connected to Eir Sagemcom routers

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LukeArchbold
LukeArchbold Posts: 24 image  Freshman Member
First Comment First Anniversary
in Switch

Hi all,

Encountered this issue on mutiple client sites where Eir Sagemcom routers have been installed. When installing switches specific models GS1920-8hp, GS1920-24hp and GS1920-48hp Switch boots up just fine and any devices connected work perfectly,

However the switch itself fails to find the default gateway and must be configured manually before the switch will register with NCC.

Has anyone encounterd this issue?

All Replies

  • Zyxel_Tina
    Zyxel_Tina Posts: 717 image  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Switch 100 Answers 500 Comments

    Hi @LukeArchbold,

    Regarding the issue you’re encountering, please first verify DHCP server functionality on the Sagemcom router, whether it is correctly providing the default gateway option (DHCP Option 3).

    In our local testing with USG FLEX 200H, we confirmed that the default gateway is successfully received.

    Therefore, if possible, we recommend capturing packets to confirm whether the router is sending the default gateway information in its DHCP Offer. This will help us narrow it down and investigate further.

    Zyxel Tina

  • LukeArchbold
    LukeArchbold Posts: 24 image  Freshman Member
    First Comment First Anniversary
    edited April 2

    Hi Tina,

    We have done some futher testing and found that when the network edge device is a Zyxel router or firewall the issue doesnt occur.

    When connected to an ISP router (Eir Sagemcom or Virgin Hub) the switch doesnt pick up an IP through DHCP and does not connect back to Nebula. The switch works properly otherwis we just cant monitor it using the Nebula dashboard.

    Kind regards,

    Lue Archbold

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