Good morning. I’m facing a problem I can't seem to solve: I can't get my DHCP service (range 172.16.0.1/16) to pass through my bridge and VLAN 1; nothing is able to obtain an address from that DHCP pool. I also tried injecting DHCP traffic from another device via ports 7 and 8 with VLAN 1 tagged. C…

Maybe I missed something, but nowhere do I see a DHCP server configured on the bridge/vlan1 . . . Or, for that matter, an untagged port with PVID 1 that could access it.

To use VLAN 1 is always a bad idea, let alone tagged, due to differences in its implementation on different devices. Better to use some VLAN ID other than 1 or 0 also in an all-VLAN setup

Use it heavily, and always have. It's the default for untagged . . . Likely more standard than other solutions - anything else would be an exception. (Cisco, Netgear, TPLink, Mikrotik all coexist flawlessly). Then again, I have zero desire (or reason) to use 100% tagged . . . . (and I'd never try t…

[image] ArielIC: I’m facing a problem I can't seem to solve: I can't get my DHCP service (range 172.16.0.1/16) to pass through my bridge and VLAN 1; nothing is able to obtain an address from that DHCP pool. What is acting as the dhcp server? Is it using untagged traffic? How is it connected…

It isn't usual to see someone using tags with vlan 1. It is allowed by the IEEE802.1Q standard, but some vendors (e.g. Ubiquiti with Unifi) won't even allow you to configure vlan 1 with tags, and they use "vlan 1" almost interchangably with "untagged", although they allow other vlans to be either t…

And don't forget Rules #1 and #2 :wink:: [image] The twelve Rules of Mikrotik Club Beginner Basics Preamble and disclaimer: The following is a set of Rules that are intended as advice useful to avoid the most common errors observed in configuration posted on t…

Well, it’s clear I messed up the VLAN1 configuration. Let me explain: aside from this device, I didn't have anything on VLAN1. However, when I tried connecting a couple of salvaged UniFi AC-Mesh units (which do work), I realized that without VLAN1, they couldn't be configured via the CloudKey—and th…

I never set anything implicitly for VLAN1 on my bridge. With ports set to PVID 1, RouterOS creates the entry automagically. You won't see an entry in interfaces/VLAN either (nor should you). This seems to be a "trap" that I am seeing new ROs users face plant on frequently . . . Just because you don…

[image] ArielIC: Let me explain: aside from this device, I didn't have anything on VLAN1. However, when I tried connecting a couple of salvaged UniFi AC-Mesh units (which do work), I realized that without VLAN1, they couldn't be configured via the CloudKey—and that’s where I hit a wall during th…

Have you made any progress? It doesn't appear that ether4 is used the the config you posted. If you add /interface bridge port add bridge=SW_Main frame-types=admit-only-untagged-and-priority-tagged \ interface=ether4 With no other changes, it should add ether4 as a bridge-port with vlan 1 un…

Issue with DHCP on VLAN 1 on a switch configured as a router

RouterOS General

jaclaz June 30, 2026, 11:25am 7

And don't forget Rules #1 and #2 :