![]() ![]() The terminal server is connected through its async ports to the console ports of the other devices. Such a modem eliminates the need to configure a dial backup for each device. You can configure a modem on the auxiliary port of the terminal server for dial backup in the event your primary connection (through the Internet) goes down. For a more robust security solution, you can also configure server-based authentication, authorization, and accounting (AAA) for example, RADIUS or TACACS+. If you are concerned about security, configure access lists to allow access only to the terminal server from certain addresses. You can always maintain connectivity to the terminal server and access the connected devices. When you do so, firewall issues do not interrupt your connection. In order to make the terminal server accessible, assign a registered public Internet address, and locate the server outside the firewall. ![]() This table shows the port types for console and auxiliary ports on Cisco routers and switches: Interface TypeĬonfigure the terminal server so that you can access the terminal server from anywhere. However, if the console port of the device to which you connect is a 25-pin interface (DCE), you must use the RJ-45 to 25-pin adapter marked "Modem" (to reverse the "roll") in order to complete the connection. Therefore, you can connect each cable directly to the console ports of devices with RJ-45 interfaces. DTE to DTE devices require a rolled (null modem) cable and DTE to data circuit-terminating equipment (DCE) devices require a straight-through cable. Note: The async ports from the 68-pin connector are data terminal equipment (DTE) devices. For more information on cabling refer to the Cabling Guide for Console and AUX Ports. In addition, the NM-16A or NM-32A high-density async network modules are available for the Cisco 26 series routers to provide the same function. The 2511 router allows for a maximum of 16 devices to be remotely accessible. (See CAB-OCTAL-ASYNC Cable Pinouts.) You can connect each RJ-45 rolled cable async port to the console port of a device. This cable provides eight RJ-45 rolled cable async ports on each 68-pin connector. The Cisco 2509 - 2512 series routers use a 68-pin connector and breakout cable. For more information on Reverse Telnet refer to Establishing a Reverse Telnet Session to a Modem. Reverse Telnet allows you to establish a Telnet connection out on the same device you telnet from, but on a different interface. This document shows how to configure a terminal server to access only the console ports on other routers through Reverse Telnet. You can also configure a single modem on the auxiliary port of the terminal server, to provide dial-up service to the other devices when network connectivity fails. A terminal server eliminates the need to configure backup scenarios like modems on auxiliary ports for every device. The terminal server allows you to use a single point to access the console ports of many devices. ![]() A terminal server is a router with multiple, low speed, asynchronous ports that are connected to other serial devices, for example, modems or console ports on routers or switches. Background InformationĪ terminal or comm server commonly provides out-of-band access for multiple devices. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. If your network is live, ensure that you understand the potential impact of any command. This document is not restricted to specific software and hardware versions. ![]() There are no specific requirements for this document. This document describes how to configure a terminal server to access only the console ports on other routers through Reverse Telnet. ![]()
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