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Essential Ports

Discussion in 'Networks & Internet Connectivity' started by Blackstar_solar, 1 Feb 2006.

  1. Blackstar_solar

    Hitman

    Joined: 7 Nov 2005

    Posts: 728

    Location: Southampton, UK

    What do people consider to be ports that are essential for web access?

    Obviously ports 80 and 8080 but anythign else?

    I ask becuase a couple of my housemates are downloading huge files off the net all the time taking up all the bandwidth!!! and my router (which i admin :)) has the ability to block port ranges at certain times of day.

    So basically I want them to have e-mail, msn, irc, ftp and net access. Anything else? and which ports?
     
    Last edited: 1 Feb 2006
  2. mosfet

    Wise Guy

    Joined: 28 Sep 2004

    Posts: 1,152

    Location: London

    27015, counterstrike.
     
  3. Blackstar_solar

    Hitman

    Joined: 7 Nov 2005

    Posts: 728

    Location: Southampton, UK

    lol, naw none of them play games at all..weirdos!! :p
     
  4. T180985

    Gangster

    Joined: 22 Aug 2005

    Posts: 230

    port 443 for https
     
  5. Blackstar_solar

    Hitman

    Joined: 7 Nov 2005

    Posts: 728

    Location: Southampton, UK

    Thus far I have these:

    21 FTP (File Transfer Protocol)
    22 SSH (Secure Shell)
    25 SMTP (Send Mail Transfer Protocol)
    80 HTTP (HyperText Transfer Protocol)
    110 POP3 (Post Office Protocol, version 3)
    443 HTTPS
    4000 ICQ
    8080 HTTP
    6901,6891-6900,1863 MSN Messenger

    Any others?
     
  6. Burbleflop

    PermaBanned

    Joined: 7 May 2003

    Posts: 4,247

    Location: Away from here

    53 will be pretty useful too.

    But, if your housemates are downloading files from the internet (as opposed to P2P) then as soon as you open port 80, they'll be back downloading again.
     
  7. topher

    Mobster

    Joined: 3 Jan 2003

    Posts: 3,566

    Port 3389 - RDP

    and for people that dont know port 53 is for DNS

    Port 25 - smtp (if you need it)
     
  8. Burbleflop

    PermaBanned

    Joined: 7 May 2003

    Posts: 4,247

    Location: Away from here

    ;)

    BTW, SMTP = Simple Mail Transfer Protocol, not Send.
     
  9. Ricochet J

    Capodecina

    Joined: 29 Jun 2004

    Posts: 12,906

    What is SNMP used for and on what port? Is it important?
     
  10. tolien

    Caporegime

    Joined: 16 May 2003

    Posts: 25,368

    Location: ::1

    There shouldn't be any SNMP traffic going around, either out onto the internet, or coming in from the internet.
    None the less, default SNMP port is 161.
     
  11. Burbleflop

    PermaBanned

    Joined: 7 May 2003

    Posts: 4,247

    Location: Away from here

    SNMP = Simple Network Management Protocol. It used for remote management of SNMP aware devices and also for monitoring SNMP enabled devices. Programs like MRTG use SNMP to query interfaces on a router to come up with graphs and the like.
     
  12. mattbrown91

    Wise Guy

    Joined: 27 Sep 2004

    Posts: 2,328

    Location: Ilkley / London

    23 for telnet, but if your using SSH....Ignore
     
  13. Si MPS

    Hitman

    Joined: 20 Jun 2004

    Posts: 911

    Location: Manchester

    How about you just speak to your housemates and explain, without resorting to stupid drastic (and childish) methods simply because you know how to?
     
  14. Blackstar_solar

    Hitman

    Joined: 7 Nov 2005

    Posts: 728

    Location: Southampton, UK

    Ohhh flaming...how original!:p

    I already have, and they're still doing it! Hence not drastic or childish
     
  15. R4z0r

    Mobster

    Joined: 26 Oct 2002

    Posts: 3,492

    Location: London

    How exactly is your router going to do this? Are you blocking all but your selected ports *outwards*? Remeber, clients make connections to server on these well-known ports so blocking all but those ports *inbound* won't help

    If so, what are you blocking incomming? After your clients request a connection to the server, the server will connect back to you on a random port so your firewall must be capable of tracking "established" connections.