Essential Ports

Blackstar_solar · 1 Feb 2006 at 14:52

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?

mosfet · 1 Feb 2006 at 15:12

27015, counterstrike.

Blackstar_solar · 1 Feb 2006 at 15:17

lol, naw none of them play games at all..weirdos!!

T180985 · 1 Feb 2006 at 16:08

port 443 for https

Blackstar_solar · 1 Feb 2006 at 16:26

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?

Burbleflop · 1 Feb 2006 at 17:21

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.

topher · 1 Feb 2006 at 18:08

Port 3389 - RDP

and for people that dont know port 53 is for DNS

Port 25 - smtp (if you need it)

Burbleflop · 1 Feb 2006 at 19:17

topher said:
Port 25 - smtp (if you need it)

Blackstar_solar said:
25 SMTP (Send Mail Transfer Protocol)

BTW, SMTP = Simple Mail Transfer Protocol, not Send.

Ricochet J · 1 Feb 2006 at 19:39

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

tolien · 1 Feb 2006 at 21:53

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.

Burbleflop · 2 Feb 2006 at 07:25

eXSBass said:
What is SNMP used for and on what port? Is it important?

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.

mattbrown91 · 2 Feb 2006 at 07:30

23 for telnet, but if your using SSH....Ignore

Si MPS · 2 Feb 2006 at 08:25

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

Blackstar_solar · 2 Feb 2006 at 09:44

Si MPS said:
How about you just speak to your housemates and explain, without resorting to stupid drastic (and childish) methods simply because you know how to?

Ohhh flaming...how original!

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

R4z0r · 2 Feb 2006 at 21:19

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.