Posted on Saturday, 10th January 2009 by Angel Castaneda
While memorizing a bunch of port numbers definitely helps you impress the ladies, not everyone has that ability. Fortunately, you can check common port numbers right on the Cisco IOS command line.
Router> enable
Router# conf t
Router# access-list 100 permit tcp any any eq ?
This will result in the following table:
<0-65535> Port number
bgp Border Gateway Protocol (179)
chargen Character generator (19)
cmd Remote commands (rcmd, 514)
daytime Daytime (13)
discard Discard (9)
domain Domain Name Service (53)
echo Echo (7)
exec Exec (rsh, 512)
finger Finger (79)
ftp File Transfer Protocol (21)
ftp-data FTP data connections (used infrequently, 20)
gopher Gopher (70)
hostname NIC hostname server (101)
ident Ident Protocol (113)
irc Internet Relay Chat (194)
klogin Kerberos login (543)
kshell Kerberos shell (544)
login Login (rlogin, 513)
lpd Printer service (515)
nntp Network News Transport Protocol (119)
pim-auto-rp PIM Auto-RP (496)
pop2 Post Office Protocol v2 (109)
pop3 Post Office Protocol v3 (110)
smtp Simple Mail Transport Protocol (25)
sunrpc Sun Remote Procedure Call (111)
syslog Syslog (514)
tacacs TAC Access Control System (49)
talk Talk (517)
telnet Telnet (23)
time Time (37)
uucp Unix-to-Unix Copy Program (540)
whois Nicname (43)
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Posted in General | Comments (2)
January 10th, 2009 at 2:34 pm
[...] Note: Sean suggested I blog about my CCNA studies on his website. This post was originally posted there, and I might be doing some cross posting for the next little [...]
January 14th, 2009 at 3:21 am
It’s even easier: “show ip port-map”.