TCP/UDP small servers

 

  • TCP and UDP small servers are generally used on routers for diagnostic purposes and should not be enabled during normal operations.
  • tcp-small-servers services are disabled by default since IOS in version 11.3

 

Tcp-small-servers

 

  • enable/disable service by typing command

(config)#service tcp-small-servers

  • there is possibility to set maximum number of tcp servers -  command "max-servers"
  • tcp-small-servers consists from:

Echo

it returns what we type on screen,e.g. after typing dd we receiced dd and so on.

telnet_echo.JPG

Chargen

it returns ASCII string,e,g,  telnet 192.168.1.1. chargen"

 

telnet_chargen.JPG

 

Discard

drop everything what you type

 

Daytime

it returns system date and time.

telnet_daytime.JPG

 

Udp-small-servers

  • enable/disable service by typing command

(config)#service udp-small-servers

  • there is possibility to set maximum number of udp servers -  command "max-servers"
  •  udp-small-servers consists from:

 Echo

echoes payload of the datagram you send

Discard

silently piches the datagram you send

Chargen

 pitches the datagram you send and respond with a 72-character stirng of ASCII characters terminated with a CR+LF

 

dzbanek 2011-10-19

 

 

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