Tuesday, March 17, 2015

Increase the number of telnet sessions allowed in Linux

Increase the number of telnet sessions allowed

Under Linux (Red Hat / CentOS Linux) xinetd is used to control the telnet server.  The eXtended InterNET Daemon, is an open-source daemon which runs on on many Unix systems and manages Internet-based connectivity.  It offers a more secure extension to or version of inetd, the Internet daemon.
xinetd features access control mechanisms, extensive logging capabilities, and the ability to make services available based on time. It can place limits on the number of servers that the system can start, and has deployable defence mechanisms to protect against port scanners, among other things.
You need to edit /etc/xinetd.conf or /etc/xinetd.conf/telnet file and set instances = unlimited:# vi /etc/xinetd.confEdit instances line so that it should read as follows:instances = unlimitedORinstances = 300Restart the xinetd service:# /etc/init.d/xinetd restart

Monday, March 16, 2015

How to Disable Comcast Xfinity Public Wi-Fi

How to Disable Comcast Xfinity Public Wi-Fi

UPDATED with model numbers of Xfinity routers affected.
Those who use Comcast's Xfinity-branded residential-gateway broadband routers, which combine a cable modem with an Ethernet and wireless router, could soon find themselves becoming mules for the company's publicly available network. Comcast announced recently that it is starting to turn on a second Wi-Fi signal in its customers' home routers that could be used by anyone with an Xfinity account — even total strangers who happen to be driving by.
The company has already activated this feature on hundreds of thousands of routers in parts of Florida, Minnesota, Pennsylvania and New Jersey, and in the Houston and Washington, D.C., metro areas. It intends to turn on millions of these hotspots in the coming months.
It's not immediately clear which models of gateway routers are affected, but Comcast states on its website that the feature is not available to those subscribed to Comcast's Economy Internet package.
A Comcast Internet technical-support representative told us after this story was first published that the Arris TG862G and Technicolor TC8305 models support the public Wi-Fi hotspot feature, while Cisco and SMC models do not as of yet. While the Cisco devices do have two antennas, they're only for dual-band Wi-Fi in the home, said the tech-support rep. The SMC models have only one antenna.
If you use one of the affected models, you might want to turn the home hotspot feature off. While we don't expect there to be severe security risks with the second network being opened up, it is likely that more people using your hotspot could slow your overall Internet connection.
Prevent that from happening by tuning off the home-hotspot feature. Make sure your Comcast username and password are handy, and follow these easy steps to turn off the second signal in your Comcast router.

2. Log into your account.

3. Select Users & Preferences from the top navigation bar.
4. Click "Manage Xfinity WiFi" under the Service Address section.
5. Select "Disable Xfinity WiFi Home Hotspot" in the dialog box that pops up. If you don't see the option to enable or disable the home hotspot, the feature may not have been activated in your area, or your modem/router combination may not be compliant.
6. Save your changes.