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.
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 18.104.22.168 daytime
Here is the list
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)