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VLAN & Network Issues in Synology SRM Explained

VLANs are essential for segmenting networks, improving security, and managing traffic efficiently. However, misconfigurations can lead to connectivity issues, slow performance, and security gaps. If you are using Synology Router Manager (SRM) on a Synology router, understanding common VLAN and network issues is critical.

This guide explains the most frequent problems and how to fix them.

What VLANs Do in SRM

VLANs (Virtual Local Area Networks) allow you to:

  • Separate network traffic
  • Improve security
  • Isolate devices (e.g., guest vs business networks)

When configured correctly, VLANs enhance both performance and control.

Common VLAN Issues in SRM

Incorrect VLAN Tagging

One of the most common issues is mismatched VLAN tagging.

Symptoms:

  • Devices cannot connect
  • No internet access
  • Intermittent connectivity

Fix:

  • Verify VLAN IDs match across router and switch
  • Ensure proper tagging/untagging configuration
  • Check trunk and access port settings

Misconfigured DHCP Settings

Each VLAN should have its own DHCP configuration.

Symptoms:

  • Devices not receiving IP addresses
  • IP conflicts

Fix:

  • Enable DHCP per VLAN
  • Assign correct IP ranges
  • Avoid overlapping subnets

Routing Between VLANs Not Working

VLANs are isolated by default, which can cause communication issues.

Symptoms:

  • Devices in different VLANs cannot communicate
  • Blocked access to shared resources

Fix:

  • Configure inter-VLAN routing
  • Set firewall rules to allow necessary traffic
  • Verify gateway settings

Firewall Blocking Traffic

SRM firewall rules may block VLAN communication.

Symptoms:

  • Partial connectivity
  • Blocked services

Fix:

  • Review firewall rules
  • Allow traffic between VLANs where needed
  • Restrict unnecessary access

Switch Compatibility Issues

Not all switches handle VLANs the same way.

Symptoms:

  • VLANs not functioning correctly
  • Inconsistent connectivity

Fix:

  • Use VLAN-capable managed switches
  • Ensure compatibility with SRM
  • Update switch firmware

Performance Issues in VLAN Networks

Network Congestion

Heavy traffic across VLANs can cause slowdowns.

Fix:

  • Implement Quality of Service (QoS)
  • Prioritize critical applications
  • Balance network traffic

Bandwidth Limitations

Insufficient bandwidth affects performance.

Fix:

  • Upgrade to higher-speed connections (e.g., 10GbE)
  • Use link aggregation where possible

Improper Network Segmentation

Too many VLANs without planning can reduce efficiency.

Fix:

  • Design VLAN structure based on usage
  • Avoid unnecessary segmentation

Best Practices for VLAN Setup in SRM

  • Use clear VLAN naming conventions
  • Assign dedicated subnets per VLAN
  • Document network architecture
  • Test configurations before deployment

Proper planning reduces future issues.

Monitoring and Troubleshooting Tools

Use SRM tools to monitor network health:

  • Traffic monitoring
  • Device tracking
  • Log analysis

These tools help identify and resolve issues quickly.

VLAN Design Impacts Security

A well-designed VLAN structure not only improves performance but also strengthens security. By isolating sensitive systems and limiting communication between segments, businesses can reduce the risk of lateral movement during cyberattacks. Proper VLAN planning is a key part of a secure network architecture.

How Epis Technology Fixes VLAN and Network Issues

Epis Technology helps businesses design and troubleshoot VLAN configurations and network performance issues in Synology SRM environments. From initial setup to advanced optimization, Epis Technology ensures reliable and secure networking.

The company provides services including large storage solutions, Microsoft 365 and Google Workspace backups, fully managed PC backups, and Synology consulting and support. Epis Technology also assists with network design, security configuration, and performance tuning.

About Epis Technology

Epis Technology provides enterprise IT infrastructure, Synology consulting, and data protection solutions for organizations of all sizes. The company specializes in network optimization, storage systems, and secure deployments. Through expert design, implementation, and ongoing support, Epis Technology helps businesses build efficient, scalable, and high-performance IT environments.

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