Cisco 7604 Configuration Guide - Page 524
Allowing SSH Access
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Allowing SSH Access Chapter 23 Configuring Management Access To configure Telnet access to the FWSM, perform the following steps: Step 1 Step 2 To identify the IP addresses from which the FWSM accepts connections, enter the following command for each address or subnet: hostname(config)# telnet source_IP_address mask source_interface If there is only one interface, you can configure Telnet to access that interface as long as the interface has a security level of 100. (Optional) To set the duration for how long a Telnet session can be idle before the FWSM disconnects the session, enter the following command: hostname(config)# telnet timeout minutes Set the timeout from 1 to 1440 minutes. The default is 5 minutes. The default duration is too short in most cases and should be increased until all pre-production testing and troubleshooting has been completed. For example, to let a host on the inside interface with an address of 192.168.1.2 access the FWSM, enter the following command: hostname(config)# telnet 192.168.1.2 255.255.255.255 inside hostname(config)# telnet timeout 30 To allow all users on the 192.168.3.0 network to access the FWSM on the inside interface, enter the following command: hostname(config)# telnet 192.168.3.0 255.255.255.0 inside Allowing SSH Access The FWSM allows SSH connections to the FWSM for management purposes. The FWSM allows a maximum of 5 concurrent SSH connections per context, if available, with a maximum of 100 connections divided between all contexts. You can control the number of SSH sessions allowed per context using resource classes. (See the "Configuring a Class" section on page 4-24.) In admin context only, you can have up to 15 Telnet and 15 SSH sessions concurrently. Note Please note that if you have two or more concurrent Telnet or SSH sessions and one of the sessions is at the More prompt, the other sessions may hang until the More prompt is dismissed. To disable the More prompt and avoid this situation, enter the pager lines 0 command. SSH is an application running on top of a reliable transport layer, such as TCP/IP, that provides strong authentication and encryption capabilities. The FWSM supports the SSH remote shell functionality provided in SSH Versions 1 and 2 and supports DES and 3DES ciphers. Note XML management over SSL and SSH are not supported. This section includes the following topics: • Configuring SSH Access, page 23-3 • Using an SSH Client, page 23-3 23-2 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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