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  • Snep :floofHappy: @40C3snep
    Dec 11, 2025, 5:39 PM

    Got a Zyxel managed switch from work and I'm trying to get it to use DHCP.

    When logging in to the switch at its default IP of 192.168.1.1 (which IMO is a terrible default IP for non-router network devices), you can change it over to DHCP easily.

    But! Once you hit apply, the switch *immediately* moves over to DHCP.

    Not a huge problem, a quick look at the DHCP table and there's the login page again.

    Well, it only allows a single login at a time, like the one you just got disconnected from.

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Replies

  • Snep :floofHappy: @40C3snep
    Dec 11, 2025, 5:39 PM

    Hmm, maybe a reboot helps?

    Nope, it's the switch design that requires a separate "Save configuration" button press after making a change to write the config to NVRAM.

    Which is impossible to do after hitting Apply on the DHCP setting as it immediately loses its previous IP address, so after a power-cycle, you're back to square one.

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  • Snep :floofHappy: @40C3snep
    Dec 11, 2025, 5:39 PM

    So the only option is to wait three minutes until the previous login times out before attempting to reconnect again.

    What a great user experience especially if there's multiple switches that need deploying!

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  • Jima :ivoted:jima@mspsocial.net
    Dec 14, 2025, 5:14 AM

    @snep @gorplop I will stand by my assertion that any "managed switch" without a serial port is, in fact, what's colloquially known as a "'smart' switch." 🙄

    (One can probably glean my opinion of "'smart' switches" from this, and bear in mind that I have several deployed in my home. 😒)

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  • Snep :floofHappy: @40C3snep
    Dec 14, 2025, 2:27 AM

    @drscriptt Perhaps an ad-hoc dnsmasq instace with a simple DHCP config on the laptop I already configured 192.168.1.1 on to initially connect would work, in addition to adjusting the firewall on it, but honestly, that only marginally improves the user experience, if at all...

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  • DrScripttdrscriptt@oldbytes.space
    Dec 14, 2025, 2:50 AM

    @snep valid option.

    Working around questionable design decisions.

    🤦🏻‍♂️🤦🏻‍♂️🤦🏻‍♂️

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  • Jima :ivoted:jima@mspsocial.net
    Dec 12, 2025, 1:39 PM

    @snep Ennnh my vague recollection is that it was a "Cisco Business" line switch, which is to say the rebranding of "Linksys Business," post-acquisition. It was a shit switch, but in that era it was the best for which my employer at the time would spring.

    Which isn't to deny the "reset button can be activated by ethernet cable boot" debacle on the Catalyst line — Cisco isn't immune to boneheaded moves, correct. 😀

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