Megabus and the Bolt Bus both offer Wi-Fi on their bus lines, so you can stay connected while traveling. Unplggd details nine other unusual locations, but the takeaway is really this: if you want free Wi-Fi wherever you're going, make a phone call to find out if they have it. While you can often find free Wi-Fi hotspots online, many places do not advertise their free Wi-Fi. Even if their Wi-Fi isn't generally available to customers, they'll often let you use it if you ask nicely.
Before you start making use of the numerous free Wi-Fi hotspots, be sure to learn how to stay safe on public Wi-Fi networks. If you're in a residential area, a little war-driving with the right equipment can turn up an open "linksys" hotspot. Rather than breaking open your conspicuous laptop, use your Wi-Fi-enabled smartphone or a Wi-Fi scanner keychain to scan and detect networks.
See the smartphone apps for finding open networks below. The serious nerd can even outfit him or herself in a Wi-Fi scanning t-shirt , hat , or pair of sneakers. Sometimes the built-in scanner on your smartphone or laptop can be too slow or won't give you all the information you want about area networks. Here are some free apps and tools for scanning and finding free Wi-Fi networks. When Windows' built-in Wi-Fi network detector isn't cutting it, download the free NetStumbler to get a detailed listing of available networks listed by channel, signal strength, and security type, including "hidden" SSID's your PC might not detect otherwise.
Previously-mentioned free Windows app WeFi offers a community-generated database of free hotspots for searching. It does an okay job of finding hotspots, but beware of optional crapware in the installation process. Just say no. On the Mac, iStumbler is the free scanner application of choice. Smartphones: iPhone, BlackBerry, Windows Mobile, Android Your Wi-Fi enabled smartphone can scan for nearby networks using its built-in antenna, but a few apps let you search near your location or another location, too.
This returns a list of names relating to the IPs scanned, which can be incredibly useful for identifying what certain IP addresses are actually for providing they have a related name! It is important to note that you require one open and one closed port in order to use the —O command. Version detection is the name given to a command that allows you to find out what software version a computer is running. Instead, it tries to detect what software a computer runs using the information given by an open port.
You can use version detection by typing up the -sV command and selecting your IP of choice, for example:. When running any scan through Nmap, you might require more information. Entering the verbose command -v will provide you with additional details on what Nmap is doing. Nine levels of verbosity are available on Nmap, from -4 to 4 :. Increasing the verbosity is great for finding ways to optimize your scans.
You increase the amount of information that you have access to and provide yourself with more information to make targeted improvements to your network infrastructure. The NSE allows users to write scripts in Lua so they can automate various networking tasks. A number of different script categories can be created with the NSE.
These are:. The NSE can be quite complicated to get your head around at first, but after the initial learning curve, it becomes much easier to navigate. For example, entering the command -sC will allow you to use the common scripts native to the platform. If you want to run your own scripts, you can use the —script option instead.
It is important to remember that any scripts you run could damage your system, so double check everything before deciding to run scripts. On Zenmap you can create and execute commands and scans. The GUI is much more user-friendly than the command line interface, making it ideal for newer users. It can be used for real-time monitoring or historical data analysis. The GUI can also show graphical comparisons of service test results, for example:. WhatsUp Gold is a real-time monitor with an autodiscovery function, which covers wired, wireless, and virtual environments.
The software for this infrastructure monitoring tool installs on Windows Server R2, , R2, and The first run of the utility will kick off the network discovery routines.
These log all of the Layer 2 and Layer 3 devices switches and routers on your network and record them in a register. The discovery process also generates a network map. The logging system keeps running constantly so any changes in the network will be reflected in the map.
Cloud-based services that your company uses also get included on the map and you can cover multiple sites to plot your WAN on one map. The type of devices is also registered. This helps the monitor adjust processes accordingly for each type of equipment. A detailed popup attached to each icon in the map will show you details about that piece of equipment. The statuses of the devices in the network system are monitored with SNMP.
The map shows the health of each device with color: green for good, yellow for warning, and red for bad. So, you can see at a glance how all of those pieces of equipment are doing. Network link status is also highlighted with color: green for good, yellow for warning, and red for congested.
You can get a Network Traffic Analysis add-on for WhatsUp Gold to get deeper intelligence on the performance of your network. This gives you greater troubleshooting capabilities through the insights on network performance both by link and end-to-end.
A capacity planning scanning tool helps you predict demand and expand resources where necessary. Once each piece of equipment has been discovered, it is logged in an inventory. You can reorganize the map manually if you like and you can also specify customized layouts. Cloud services are also included in the network map. The network discovery function of PRTG runs continually. So, if you add, move, or remove a device, that change will automatically be shown in the network map and the equipment inventory will also be updated.
Each device on the map is labeled with its IP address. Alternatively, you can choose to have devices identified by their MAC addresses or their hostnames. Each device icon in the map is a link through to a detail window, which gives information on that piece of equipment.
You can change the display of the network map to limit it to devices of a particular type, or just show one section of the network.
0コメント