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?
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?
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.
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.
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.
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
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.
