Figure 1: Disable file sharing issues
If you have multiple computers at home or in the office and they are connected to a network, it may be necessary to share files with colleagues - that's why we set up a network. Here you have several options to improve your network security, depending on whether your broadband Internet connection is being shared. Let's take a look at these options.
If the broadband Internet connection is being shared using a router - this is a device that you plug into your modem and computers that want to share the Internet connection. These routers work as a firewall and block incoming requests for folders and files. So you can share files in your office and home network without having to worry about being exposed by file sharing.
But if you don't use a router, you need to be very careful. Maybe an Internet-connected computer is also the second network card that connects this computer to another computer (usually via a crossover cable) or it can be to a hub or a switch, to share the Internet connection with other computers. In this case, the Internet-connected computer has some vulnerabilities and all computers on the Internet can access its files if file sharing is enabled!
There are several solutions to this problem. The best is to spend some budget and buy a broadband router. As we said, this device also functions as a firewall, protecting your entire network. Installing this device is easy, just plug the Internet connection (cable from the xDSL modem or cable) into the WAN, Boadband or similar jack, then plug the other end into the computer on your network. If you need multiple ports - because these devices often have up to 4 ports - buy a switch with the desired port number and connect this device to one of the router's ports. The switch will work as an extension port. Some routers have wireless antennas to share Internet connectivity with laptops and desktops with wireless connectivity. In this case you need to learn more about wireless security.
However, if you don't have a lot of money, you can simply disable file sharing from an Internet-connected computer. But sometimes this computer needs to share files because it is not always disabled. In this case there are two solutions. First, put all the files you want to share into another computer and enable file sharing on this computer. Or transfer the broadband modem to a computer that doesn't need file sharing.
You may wonder why it is safe to enable file sharing on other computers that do not have a modem. What happens is, usually a modem will have a common IP address. A computer with a public IP address can be viewed by anyone on the Internet. Other computers do not have this type of IP address (computers on the network usually have the form 192.168.xx or 10.xxx,), which are IP addresses that only work on a local network. Computers with this internal IP address are not compromised by anyone from the Internet, so they are safe. At least with file sharing. Don't forget that there are many other types of attacks like phishing .
Personal firewalls are also a good idea. If you use Windows XP, install SP2 package because it has Windows firewall feature, which can prevent malicious software from attacking your computer and if you accidentally install a Trojan The horse can block its attempts to send data out of the computer.
In addition to these threats, there are many other security-related issues such as malware and spyware. Along with it, there are many software that can detect and eliminate these threats. So, install useful software to keep your computer and network safe.