What if you want to use the NetWatcher sensor/service to monitor the security of your networks traffic and you only have a router from your Internet Services Provider (ISP) and a WIFI device? See figure 1 below.
Figure 1 - Typical home network setup
Most WIFI devices do not support “Port Mirroring” and this is traditionally what a network sensor doing deep packet inspection requires. Unfortunately, the lack of a port mirroring feature means that you may need to add additional hardware to monitor the network traffic.
There are a few options in regards to setting up port mirroring on your network--There is a ‘good’, ‘better’, ‘best’ approach.
The GOOD approach
Let’s first explain the ‘good’ way. This is to add a router that does port mirroring and DHCP to the network. Note that with any of these options you may be able to replace your ISP provided router with this new router assuming and save yourself some dollars on your monthly bill (check with your ISP).
This ‘good’ approach would look something like the following in figure 2.
Figure 2 - Adding a router that does port mirroring and DHCP to network
With this ‘good’ enough setup you have to turn off DHCP on the WIFI router and run DHCP on the new router. If you did not turn off DHCP on the WIFI you would only see the IP address and MAC address of the WIFI router in all packets and that would not allow you to determine what device connecting to the wireless (and reported by NetWatcher) may have an issue.
Here is an example of a router you may want to consider:
The BETTER approach
The ‘better’ approach is to add a firewall that also provides DHCP to this network. The firewall provides the necessary inbound protection to the network and the managed switch provides the ability to do a mirror port. In this setup you also have to turn off DHCP on the WIFI device and then turn on DHCP on the firewall to ensure you see all the traffic’s IP addresses and MAC addresses of the devices connecting to the WIFI.
Figure 3 - Adding a firewall and managed switch to the network
Here is an example of a Firewall you might want to consider:
- http://www.sonicwall.com/products/sonicwall-tz/ (note you would not need the wireless option)
Here is an example of a managed switch you might want to consider:
The BEST approach
The ‘best’ approach is to use a firewall that offers both port mirroring and WIFI and DHCP.
Figure 4 - Use Firewall / WIFI that supports port mirroring
Here is an example of a firewalls that also offer WIFI and port mirroring that you may want to consider:
- http://www.sonicwall.com/products/sonicwall-tz/ (note you would need the wireless option)