CISCO IOS in a Nutshell

Name

service — global

Synopsis

service service
no service service
            

Configures

Service level items

Default

Depends on the service

Description

The service command disables or enables certain router features. These features range from minor TCP/IP servers to the router’s callback behavior. The services controlled by this command are:

config

Enables autoloading configuration files from a server. This command is required for boot network commands to work.

exec-callback

Enables the callback feature for clients. A callback tells the router to authenticate a dial-in user, disconnect, and then call the user back at a prearranged number. See Chapter 11 for more information.

exec-wait

Delays the display of the prompt.

finger

Allows finger requests to be made to the router (i.e., enables a finger server). For IOS 12.0 and later, this has been superseded by ip finger.

hide-telnet-address

Hides the IP address of the destination host when a telnet command is issued. When a user executes a telnet command at the EXEC prompt, the IP address of the destination machine is usually displayed with a message like “Trying machinename (10.10.1.4).”

nagle

Enables the Nagle congestion control algorithm.

password-encryption

Enables password encryption. By default, password encryption is enabled.

prompt config

Enables the display of the (config) prompt when in the configuration mode.

tcp-keepalives-in

Enables TCP keepalives on incoming connections (connections initiated by remote hosts).

tcp-keepalives-out

Enables TCP ...