Core switches in different VLANs cannot communicate with each other

If devices in different VLANs cannot communicate, routing between VLANs may be missing. sql CopyEdit show ip route 🔹 If routing is missing, manually configure it: nginx CopyEdit...

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Jul 05, 2025

Users in a VLAN Cannot Communicate with Each Other

If users in different VLANs cannot communicate with each other, rectify the fault according to the IP Forwarding Troubleshooting.

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Jan 29, 2026

Troubleshooting VLAN Connectivity Issues

There can be a few different causes for VLAN connectivity issues: Incorrect configurations of the virtual portgroups and physical switch ports can cause connectivity issues between VLANs. Data path

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Guide
Oct 12, 2025

Users in a VLAN Cannot Communicate with Each Other

Users in a VLAN cannot communicate with each other. Possible Causes This fault is commonly caused by one of the following: The link between users is faulty. The interfaces connected to the users are

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Guide
Jun 04, 2026

Solved: One VLAN won''t communicate between switches even

Each network has their own router. From top down it goes Router>L2 Switch> Hosts. The configuration is the same for each network. All of my VLANs will connect to the other network

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Guide
Sep 01, 2025

Cannot ping devices in other VLAN

Devices from both VLANs are able to access the internet with the "automaticly generated" NAT rules. I have only defined 2 firewall allow * from * to * rules, 1 for each VLAN. I have

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Guide
Apr 09, 2026

Solved: Layer 3 Switch

The VLAN 3 device cannot ping the routers. From the switch CLI i cannot ping the device on VLAN 3 either (192.168.1.3) despite it being able to ping the interface and VLAN 2 device as well

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Nov 17, 2025

VLAN Trouble

To isolate VLAN10 I first attempted a Switch ACL to block Source Network:VLAN10 to Destination Network:Default. When enabled, I was no longer able to connect to either device.

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Guide
Dec 23, 2025

Vlans are able to communicate with each other

To configure access lists on a MikroTik router to prevent VLANs from communicating with each other, you can use firewall rules. Access the MikroTik Router: Log in to your MikroTik router

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Guide
Nov 18, 2025

Common Problems with Inter-VLAN Routing and How to

Inter-VLAN routing allows devices in different VLANs to talk to each other. This is very useful for managing traffic and keeping networks organized,

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Apr 03, 2026

InterVLAN routing using Layer 3 switch

Figure 6. Default Gateway to SVI. This allows the host to send traffic to devices in other VLANs through the switch''s Layer 3 routing process. Without the correct

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Guide
Jan 18, 2026

Inter-VLAN Routing: Connect VLAN-to-VLAN

Inter-VLAN routing is the way computers and devices in different VLANs (Virtual Local Area Networks) talk to each other. Normally, devices in one

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Guide
Feb 12, 2026

Configure Inter-VLAN Routing with Catalyst Switches

By implementing Inter-VLAN routing, organizations can maintain the benefits of VLAN segmentation while still allowing necessary communication

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Guide
Nov 05, 2025

How to Troubleshoot Common VLAN Interface Issues

Check VLAN and Port Configuration: Begin by verifying that all ports are correctly assigned to their respective VLANs. Use the command line interface

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Guide
Jul 19, 2025

Solved: VLANs cannot communicate

I used ROAS routing, the VLANs can communicate inside one VLAN. But the 2 VLANs cannot reach each other. It looks like this: I know it is not a basic topology/network, but it should be

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Guide
Nov 20, 2025

Devices in the same vlan cannot communicate

If plug PC2 and PC3 into ports in vlan41 then all three PCs can communicate with each other. If plug all three PCs into vlan42, all of them cannot communicate with each other.

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Guide
Jun 03, 2026

Inter-VLAN Routing: Ultimate Configuration Guide for Cisco

Currently, PC1 and PC2 cannot ping each other because they are on different networks. To enable the PCs to communicate, we need to configure VLANs and

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Guide
Oct 06, 2025

Fix VLAN Misconfiguration: Step-by-Step Guide

Incorrect VLAN settings can cause traffic disruptions, unauthorized access, and inefficient network performance. This guide will help you identify and fix VLAN

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Guide
Feb 21, 2026

Users Connected to a Single Device in the Same VLAN Cannot Communicate

Possible Causes The interfaces connecting to other devices in the VLAN are down. The users in the VLAN are on different network segments. MAC address entries are incorrect. The VLAN

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Guide
May 06, 2026

How can hosts on two different VLANs communicate?

It is clear that hosts on two different VLANs can''t directly communicate on a single switch, but how do they communicate to each other at all? Do they

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Guide
Aug 22, 2025

Why Devices on Different VLANs but on the Same

A common confusion arises when devices are on different VLANs but share the same IP subnet: they can''t communicate with each other. Learn why

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Guide
Apr 09, 2026

Communication between different VLAN

In my previous understanding, there is no way to communicate between two VLANs using only layer 2. After all, this is the purpose of having VLAN. But today, I heard sth really interesting

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Guide
May 25, 2026

How to solve the problem of VLAN configuration issues?

Without inter-VLAN routing, devices on different VLANs cannot communicate with each other. --- Verify that the router or Layer 3 switch is properly configured to route traffic between VLANs.

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Guide
Jun 24, 2026

Cisco VLAN Troubleshooting Commands And VLAN Issues

No inter-VLAN routing: Devices in separate VLANs cannot connect without a router or Layer 3 switch for inter-VLAN routing. Layer 3 gateways,

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Guide
Jul 14, 2025

Problem communicating between 2 switches on the same VLAN

The problem is that a device on one switch cannot communicate with a device on the same VLAN on the other switch. Here''s my config in simple terms: On both switches ports 1, 3, 5, 7,

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