Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium


Multiple VLANs to a single Internet Gateway

Posted on 2005-04-21
Medium Priority
Last Modified: 2013-11-30
Dear Sir,

I'm having the following situation:
I have Cisco Catalyst Switch 2950 to which I want to assign VLANs.
The switch (through one of the ports) is connected to Linksys Wireless Router WRT54G (has four RJ-45 ports)
Then the Linksys Router is connected to ADSL Modem, so the router is set as a Internet Gateway (

Right now the PCs connected to the switch have Internet access through the router (as it is DHCP server), all of the ports belong to VLAN1 I guess by default.

I need to make two or more VLANs (2,3,4...) which will have Internet access through the Linksys router, but make sure that communications between the VLANs is impossible. So it will be impossible to access from one PC (VLAN 2) to another PC (VLAN 3) except Internet (which is through router, connected to the same switch).

So please, using my present network equipment, could you explain to me what and how I need to configure the switch and the router if neccessery.

Thank you in advance,

Question by:malinkovski
  • 2
LVL 79

Assisted Solution

lrmoore earned 1000 total points
ID: 13834270
You can make all the VLAN's you want, but they will never be able to communicate with anything outside their own VLAN without a Layer 3 switch, or a VLAN-capable router.
With what you have, it is not possible.
LVL 27

Accepted Solution

pseudocyber earned 1000 total points
ID: 13835391
You can't do it with present equipment.  You need to step up to a professional router which could either do sub interfaces or understand 802.1q VLAN tagging.
LVL 27

Expert Comment

ID: 13927987
Agree with lrmoore.

Featured Post

Threat Trends for MSPs to Watch

See the findings.
Despite its humble beginnings, phishing has come a long way since those first crudely constructed emails. Today, phishing sites can appear and disappear in the length of a coffee break, and it takes more than a little know-how to keep your clients secure.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This program is used to assist in finding and resolving common problems with wireless connections.
In this article, the configuration steps in Zabbix to monitor devices via SNMP will be discussed with some real examples on Cisco Router/Switch, Catalyst Switch, NAS Synology device.
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question