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Thursday, February 23, 2012

Port And Functions


Some kind of existing Port And Functions:
  • Port 1 - rcpmux; rarely used; block.
  • Port 7 - echo; see if the host can reach (ping).
  • Port 9 - discard; block.
  • Port 11 - systat; block.
  • Port 13 - daytime; do not be discussed.
  • Port 15 - netstat; unassigned; block.
  • Port 17 - qotd; quote of the day; block.
  • Port 19 - chargen; character generator; do not be discussed.
  • Port 21 - ftp (file transfer protocol); copying, changing, and deleting files; block or use the third parties of ftp software.
  • Port 23 - telnet; client and server communications, including accessing the router.
  • Port 24 - private mail; block.
  • Port 25 - SMTP (simple mail transfer protocol); limit on a single mail server.
  • Port 37 - time; do not need to be discuss.
  • Port 38 - rap; route access protocol; block.
  • Port 42 - nameserver; block.
  • Port 43 - nickname; whois; limit or should be in blocked.
  • Port 48 - auditd; block.
  • Port 49 - login; TACACS-65; block.
  • Port 53 - dns (domain name service); contains the host name; can spoof.
  • Port 67 - bootbs; boot protocol; block.
  • Port 68 - bootbs; boot protocol; block.
  • Port 69 - tftp (trivial ftp) can update the router s / w; block.
  • Port 70 - gopher; limiting.
  • Port 79 - finger; identification and login from where comes; limiting.
  • Port 80 - http (hypertext transfer protocol), you should use a proxy server.
  • Port 87 - link; blocked.
  • Port 88 - kerberos; blocked.
  • Port 94 - objcall; Tivoli; blocked.
  • Port 95 - supdup; blocked.
  • Port 109 - pop2; blocked.
  • Port 110 - POP3, must continue in patch.
  • Port 111 - rpc (remote procedure call); block; used to steal passwords and file.
  • Port 113 - auth; limiting.
  • Port 119 - NNTP (Network News Transfer Protocol) should be in blocked.
  • Port 121 - erpc; encore; blocked.
  • Port 123 - ntp; network time protocol; should be in blocked.
  • Port 135 - location service; can cause Win NT displays the CPU resource usage 100%.
  • Port 137 - netbios, name service; blocked on the router.
  • Port 138 - netbios, datagram service; blocked on the router.
  • Port 139 - netbios, session service; blocked on the router.
  • Port 143 - IMAP; need to be patched.
  • Port 512 - rxe (remote execute); blocked.
  • Port 513 - rlogin (remote login); blocked.
  • Port 514 - rsh (remote shell); blocked.
  • Port 520 - RIP (Routing Information Protocol); can spoof.
  • Port 540 - UUCP (Unix to Unix copy); can provide unauthorized access in case of configuration errors.
  • Port 744 flexn.
  • Port 2000 - OpenWindows; displays and keystroke data; blocked.
  • Port 6000-6063 - X-Windows; displays and keystroke data; blocked.

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