1 Reply Latest reply: Dec 4, 2010 11:58 AM by Conwyn RSS

    Service commands ------ ?

    Dada Khalander

      Hi All,

       

      Can anyone please explain me the functionalities of the below three service commands? Thanks.

       

      (config)# service finger

      (config)# no service tcp-small-servers

      (config)# no service udp-small-servers

       

       

       

      Thanks & Regards,

      S. Dada Khalander.

        • 1. Re: Service commands ------ ?
          Conwyn

          Hi Dada

           

          The router runs services historically similar to UNIX.

           

          TCP small services are echo, chargen, discard, daytime

          UDP small services are echo, chargen, discard

           

          Finger lists logged on users.

           

          Security people normally like them disabled to stop Denial of Service attacks.

           

          You access them with telnet router-IP service-name

           

          telnet 1.2.3.4 daytime

           

          Regards Conwyn

           

          Here is the list

           

          pabxmod(config)#service ?
            alignment              Control alignment correction and logging
            compress-config        Compress the nvram configuration file
            config                 TFTP load config files
            dhcp                   Enable DHCP server and relay agent
            disable-ip-fast-frag   Disable IP particle-based fast fragmentation
            exec-callback          Enable exec callback
            exec-wait              Delay EXEC startup on noisy lines
            finger                 Allow responses to finger requests
            hide-telnet-addresses  Hide destination addresses in telnet command
            linenumber             enable line number banner for each exec
            nagle                  Enable Nagle's congestion control algorithm
            old-slip-prompts       Allow old scripts to operate with slip/ppp
            pad                    Enable PAD commands
            password-encryption    Encrypt system passwords
            prompt                 Enable mode specific prompt
            pt-vty-logging         Log significant VTY-Async events
            sequence-numbers       Stamp logger messages with a sequence number
            slave-log              Enable log capability of slave IPs
            tcp-keepalives-in      Generate keepalives on idle incoming network connections
            tcp-keepalives-out     Generate keepalives on idle outgoing network connections
            tcp-small-servers      Enable small TCP servers (e.g., ECHO)
            telnet-zeroidle        Set TCP window 0 when connection is idle
            timestamps             Timestamp debug/log messages
            txacc-accounting       Enable transmit credit accounting
            udp-small-servers      Enable small UDP servers (e.g., ECHO)

          (config)#service ?

            alignment              Control alignment correction and logging

            compress-config        Compress the nvram configuration file

            config                 TFTP load config files

            dhcp                   Enable DHCP server and relay agent

            disable-ip-fast-frag   Disable IP particle-based fast fragmentation

            exec-callback          Enable exec callback

            exec-wait              Delay EXEC startup on noisy lines

            finger                 Allow responses to finger requests

            hide-telnet-addresses  Hide destination addresses in telnet command

            linenumber             enable line number banner for each exec

            nagle                  Enable Nagle's congestion control algorithm

            old-slip-prompts       Allow old scripts to operate with slip/ppp

            pad                    Enable PAD commands

            password-encryption    Encrypt system passwords

            prompt                 Enable mode specific prompt

            pt-vty-logging         Log significant VTY-Async events

            sequence-numbers       Stamp logger messages with a sequence number

            slave-log              Enable log capability of slave IPs

            tcp-keepalives-in      Generate keepalives on idle incoming network connections

            tcp-keepalives-out     Generate keepalives on idle outgoing network connections

            tcp-small-servers      Enable small TCP servers (e.g., ECHO)

            telnet-zeroidle        Set TCP window 0 when connection is idle

            timestamps             Timestamp debug/log messages

            txacc-accounting       Enable transmit credit accounting

            udp-small-servers      Enable small UDP servers (e.g., ECHO)