Zyxel USG20 firewall hole

There is a hole in the firewall of the USG20 in its default configuration that you need to plug.  The entry in the firewall looks like this:   There isn’t anything dangerous about this hole. It won’t allow your computers inside your network to be attacked.  It simply allows traffic to the Zywall itself for the Default_Allowed members (AH, ESP, HTTPS, IKE, NATT, GRE, VRRP).  But...

Disable SSH, telnet, and FTP access to the Zyxel USG 20

Sadly it is very common to see SSH brute force attacks.  Unless you really need SSH access to your Zyxel router, just disable it. Log in, click the gear, click System, click SSH, then uncheck the box and click apply.  Do the same thing for TELNET and FTP. You will still be able to administer your Zyxel from the HTTP interface inside your network. If you do need this access to your router, you...

Manage wireless networks in Windows 8

Microsoft removed the tool to manage wireless networks in Windows 8.  This was a useful tool for setting the priority for which access point to connect to first, and was often required if you change the security type for your wireless network. The only way to manage wireless networks now is to do it from the command prompt.  Here’s how to do it: Open a run box window (or press win+R) then...

Uploads saturate internet connection with Time Warner and the Motorola SB6141 modem

We recently switched to Time Warner (Roadrunner) for internet service. I chose to 20mbps download and 2mbps upload plan. I decided to buy my own modem rather than lease one from Time Warner, so I chose the Motorola Surfboard SB6141 which is on Time Warner’s list of approved modems.  The reviews are good and I bought this one because of IPv6 and DOCSIS3 compatibility. Hopefully I...

Zyxel USG 20 WAN IP address from DHCP from a cable modem

Today I realized that my Zyxel USG 20 would not automatically get an IP address (assigned by DHCP) from my cable modem after being disconnected. (I have a dynamic IP address from my ISP.)  I would have to log in to the dashboard and click the “Renew” button under “Interface Status Summary” to get a new IP address. This is a hassle after a power outage. (This is not an...

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