Cisco IOS software provides a PAD (packet assembler/disassembler) service that allows simple devices
such as character-mode terminals to connect to legacy X.25 networks. With this service Cisco IOS
software devices and other X.25 network equipment can establish PAD sessions. By default, the PAD
service is enabled on Cisco IOS software, but it could be used to gain unauthorized or inappropriate
access. Therefore, unless needed, this service should be disabled with the no service pad global
configuration command, as in the following example:
Router(config)# no service pad
For more information about the PAD service, refer to the following URL:
http://www.cisco.com/en/US/docs/ios/12_ ... #wp1032441