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When access controls are configured based on IP addresses versus network security policies, access attacks can occur. Spoofing, or the act of masquerading around on a network with a valid IP address that was not legitimately given, is one of these access attacks and is a common way for attackers to establish access. To spoof an IP or MAC address, an attacker need only discover the MAC address or IP address of someone they know can access a network and then change their MAC address to the MAC address that the network is familiar with. Let s take a command-line look at how to change your MAC address. First run an ifconfig command to get your current MAC address. Then, use the lladdr option of ifconfig to change your MAC address slightly.

In the Curves application, you draw assuming that the window is clean but who is responsible for clearing the previous drawing in the window Windows Forms calls the OnPaintBackground method before calling the paint handler, and this method by default clears the area with the color returned by the BackColor property. When the function responsible for painting draws the area entirely, painting the background could be useless and even problematic: the quick repaint may flicker because the eye can perceive the background clear and then the drawing of the current frame. You can use the SetStyle method of the Form class to configure the application to do all the paint operations in the handler of the paint event, and you can override OnPaintBackground to an empty method to avoid this effect.

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cedge:/Users/cedge root# ifconfig en0 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:17:f2:2a:66:12 cedge:/Users/cedge root# sudo ifconfig en0 lladdr 00:17:f2:2a:66:21 cedge:/Users/cedge root# ifconfig en0 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:17:f2:2a:66:21

You define a helper function to define a circular area around a point that is sensible to your interaction This is required in order to not require the user to pick the exact pixel corresponding to the control point: let isClose (p:Point) (l:Point) = let dx = pX - lX let dy = pY - lY (dx * dx + dy * dy) < 6 When the mouse button is pressed, you check whether the click is over any control point In this case, you store its index in the movingPoint variable; otherwise, the event is ignored: let mouseDown (p:Point) = try let idx = cpt |> ArrayfindIndex (isClose p) movingPoint <- idx with _ -> () When the mouse moves over the client area of the window, the mouse move event is generated.

If any application was blocking traffic from your machine based on its MAC address, the traffic will now be allowed. Once a machine on a network changes its MAC address, other machines will see this change and issue a line similar to the following:

You can set price alerts, tweet about your scans (although this gets obnoxious), view your history, create a wish list, and more. If you re searching for an item that either doesn t have a bar code or has a store sticker over the bar code, you can also enter your search terms by hand. Best of all, ShopSavvy supports QR codes, so if you download this app first, you can scan any of the QR codes you see in the rest of the book.

If the movingPoint member has a value other than 1, you have to update the corresponding control point with the current position of the mouse defined by the variable p: let mouseMove (p:Point) = if (movingPoint <> -1) then cpt[movingPoint] <- p formInvalidate() You next define for the window a File menu and a Settings submenu The first features the classic Exit option, and the second shows the three checked menu items that control what the paint method should draw You define menus by composing objects that correspond to the various menu entries You also define the event handlers associated with each menu item When Exit is clicked, the form is disposed.

Armed with this information, you can now set up a scanner in your logs to be notified when this line appears and then investigate all changes of MAC addresses. One way to get around this type of attack is by redirecting the access to other sentry machines that are set up to monitor these kinds of spoofing attacks. This is a deceptive active response to fool attackers into thinking attacks are succeeding, allowing an administrator to monitor what the attacker is trying to do. If you are running Snort (discussed further in 17), then your system should notice the MAC spoof and disable communications from that host automatically, thus defending you against an attack from a spoofed IP address.

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