Can I have two routers on my home network is a very popular search term.
Personally I don’t really see why. I can only assume that people are :
- Trying to reuse an old router as an access point for example
- Not sure of the other network devices like switches.
Most home networks consist of a single router which provides the Internet connection plus 1 or more network switches and Wi-Fi access points.
Network switches look physically a lot like routers as they have several Ethernet ports.
However network switches don’t divide a network into sub networks.
All devices on a switched network belong to the same network.
If you are unfamiliar with networks and sub networks think of two rooms with a door in between which is normally closed.
A room is essence represents a sub-network and is illustrated with the diagrams below showing a routed network and the room analogy.
Advantages and Disadvantages of Using 2 Routers
- The network can be made more secures than a switched network.
- Can Speed up network traffic on a busy network as it creates separate broadcast domains.
- More difficult to set up as you need more networking knowledge to configure the internal router.
- More costly as routers are more expensive than switches.
Broadcast domains -Quick explanation
In the room analogy each room represents a broadcast domain as someone giving a talk in one room cannot be heard by anyone in the other room.
Using an Old Internet Router on the Network
If you do an internet search on 2 routers on a home network this is the solution that you will normally find.
The old router is configured not as a router, but simply as a Wireless Access point and an Ethernet switch.
This configuration is shown below:
If you do this then you need to ensure that DHCP is disabled on the second router or it has no overlapping scopes with the primary router.
The IP address doesn’t conflict with the primary router.
You should also note that not all home routers will work in this configuration. My BT home router will only work with an Internet connection, so it can only be the primary router.
Today most home networks use network switches and VLANs for security.
A VLAN lets you separate your home network into smaller networks that are isolated form one another and are much easier to configure than a routed network see Using VLANs on Home Networks.
You should generally follow the adage of:
switch when you can and route when you must.
Related resources and Tutorials
- How to Setup and Configure your Home Router
- Basic Home Networking Course for Beginners
- Home Network Addressing
- Expanding Router Ports and Connecting Switches Together