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G36: Configure LAN DHCP for Guest [and Secondary] subnet?

  • July 27, 2025
  • 2 replies
  • 39 views
R
The Many

On G36, I have configured my ‘Primary’ subnet’s DHCP server to a pool of 192.168.0.0/24 IPv4 addresses and added IP reservations.  Where in the web GUI do I configure the ‘Secondary’ (192.168.26.0/24) and ‘Guest’ (192.168.28.0/24)  subnets’ DHCP for IPv4 address pool and IP reservations?

Is that configuration only accessible by logging in through 192.168.26.1 and 192.169.28.1 respectively? Is logging in through those addresses even a thing?

Please note this is not a question about WAN-side (ISP-side) DHCP; its about the router’s built-in DHCP server(s) for LAN-side IPv4  addresses. [

Best answer by SURFboard Moderator

You cannot manually configure IP addresses for secondary or guest networks, as these are simply additional networks designed for internet access only. When connected to these networks, you won’t be able to access the modem’s interface or manage network settings.


Additionally, please note that in the Connected Devices section, only devices connected to the primary network and Ethernet will be visible. Devices on the secondary or guest networks will not appear in this list.

-Rod
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2 replies

S
Wi-Fi Warriors
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You cannot manually configure IP addresses for secondary or guest networks, as these are simply additional networks designed for internet access only. When connected to these networks, you won’t be able to access the modem’s interface or manage network settings.


Additionally, please note that in the Connected Devices section, only devices connected to the primary network and Ethernet will be visible. Devices on the secondary or guest networks will not appear in this list.

SURFboard Community Moderator Team
R
The Many
  • RodHar00The Many
  • Author
  • August 1, 2025

An addendum - 

When connected to these [edit: Secondary and Guest] networks, you won’t be able to access the modem’s interface or manage network settings.

This turns out to be at least somewhat false for recently-purchased G36 devices. I just viewed and changed router administrative settings via 192.168.26.1 from a PC connected via the Home Secondary subnet. It wasn’t an extensive test of what could be changed, but I did successfully change and save several settings while connected via Secondary.

Of additional and somewhat related relevance, the DNS Servers I specified in the DHCP configuration, which appears while you’re there to be settings for Home Primary alone, are also handed out on Secondary without any additional fanfare.  It was one of the things I wanted to set when I posed my original question about DHCP configuration for Secondary, so sometimes you get at least part of what you want anyway.

While it might be obvious and well-known, with AP Isolation OFF on Secondary, devices that know each other’s IPv4 addresses on that subnet can talk to each other.  I needed that because AP Isolation is ON for Primary, and that makes network printing [via Home Primary] essentially impossible.  Lacking IP Reservations via DHCP on Secondary, I need to make the printer’s IP static and also fix the Windows IP when it connects via Secondary.

-Rod
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