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18: Security Device Manager
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SDM uses SSL to send configurations to the router and SSH to deliver actual interactive commands and the resulting output of those Be familiar with the commands, such as show commands, back to commands necessary to run SDM on the SDM s GUI Both SSL and SSH require an a router RSA key pair The generation of RSA keys for SSH was discussed in 17 To generate these keys, the router needs a host and domain name (the first two commands listed in the preceding code) However, unlike the configuration in 17, you do not need to create the RSA key pair manually; instead, the first time you access the router using SDM, the router will generate the key pair, which it will use for SSH as well as using these keys to create a self-signed SSL certificate Since SDM is web-based and uses SSL, the ip http server and ip http secure-server commands are used to enable the web server and SSL features of the router The ip http authentication command specifies the use of the local user database (username commands) to authenticate SDM access to the router The user account on the router must have a privilege level of 15 if it is to be able to configure the router using SDM The default user account and passwords in the sdmconfig-xxxxcfg file included with SDM are sdm and sdm don t use these! Change them before copying and pasting the configuration from the sdmconfig file into the router Everyone knows these passwords, and these are the first passwords an attacker will guess to break into the router The ip http timeout-policy command is optional, but it is recommended: this command determines how long an SDM connection to the HTTP server on the router should remain open The idle parameter specifies the number of seconds a web connection should remain open if no data is sent or received on the connection: the default is 180 seconds The life parameter specifies the number of seconds a web connection will be kept open to the server from when the time the connection is established to the web server The default is 180 seconds but can be increased up to 86,400 seconds (1 day) The requests parameter limits the number of concurrent requests processed on an existing connection before it is closed: the default is 1 The last part of the configuration requires you to configure the VTYs on the router: this is necessary for any type of SSH access SDM might need for accessing the router to perform interactive commands Since SDM requires the highest privilege level when implementing changes on the router (level 15), the VTYs must be assigned
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Introduction to SDM
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this level of access (privilege level 15) Second, the router will need to authenticate access using a local user database (login local) And last, you should restrict access to the VTYs to just SSH access (transport input ssh)
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Assuming you have placed the necessary configuration on your router to access SDM, you can now open a web browser on your desktop and access it You ll need to know the IP address of the router s interface On an 800 series router that shipped from Cisco, the default IP address of the inside interface is 1010101; just connect your PC to the inside interface with the correct cable type (straight if connecting to a switch port on the router or a crossover cable if connecting to a stand-alone Ethernet port) To access SDM, enter the following syntax in your web browser s address bar:
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https://router's_IP_address
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Your web browser will attempt to do a DNS lookup of the fully-qualified domain name on the router s self-signed certificate (the router created it when you attempted to access it the first time) If your router s IP address is not listed in a DNS server, you ll see a pop-up window with this error message: Security Error: Domain Mismatch Click OK to close this window You ll be prompted for a username and password: use one of the names listed on your router with the username commands Remember that the account must have a privilege level of 15 Enter a correct username and password and click the OK button A new window will pop up, as shown in Figure 18-1 If this window does not open, it is probably because you have pop-up blocking enabled In your web browser, you ll need to make an exception to pop-up blocking for the IP address of the router you re trying to access You might be prompted to accept the Java script code and to log in again, via Java, to SDM (this depends on the version of SDM being used) The original web browser window, where you typed in the URL to access the router, can be closed; however, the pop-up window needs to remain open SDM, via Java, uses this window to communicate to the router using SSL
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