How do I disable UDP

[MBrown]

My professor was telling me if I disable UDP that 90% of all popups and spam would be gone. How do I disable it?

 

[kamper]

Yeah, I'd advise against that.

 

[MBrown]

Originally posted by: kamper
Yeah, I'd advise against that.

why?

 

[bersl2]

Originally posted by: MBrown

Originally posted by: kamper
Yeah, I'd advise against that.

why?

DNS uses UDP.

 

[screw3d]

I think your professor doesn't know what he's talking about?

 

[xcript]

If you smash your computer up and throw it out the window 100% of all popups and spam will be gone.

 

[Nothinman]

Popups come from your browser which uses HTTP over TCP, SPAM comes via SMTP over TCP. Neither touch UDP for anything other than name resolution and I doubt you want to go without DNS.

 

[ForumMaster]

umm, you can't disable it and whoever told you that (your professor) doesn't know what he's talking about. the only differnece between UDP and TCP is that UDP doesn't verify the data. it is faster and is used in LAN's, for DHCP, configuring routers, and arp or rarp requests. plus, the pop-ups come through TCP. disable that and you might as well give up internet. UDP simply relies on app lvl to verify data. tell you professor that he needs to take CCNA before giving stupid advice.

 

[Nothinman]

umm, you can't disable it and whoever told you that (your professor) doesn't know what he's talking about. the only differnece between UDP and TCP is that UDP doesn't verify the data. it is faster and is used in LAN's, for DHCP, configuring routers, and arp or rarp requests.

It's not faster, it's just lower latency and TCP doesn't verify data either. The difference is that with UDP there's no real connection, you just send packets back and forth and it's up to the applications to figure out if the packet belongs to it, which session it belongs to if there's more than one, which order the packets belong in and whether or not any where dropped, basically you have to implement all of the things that TCP gets you inside of your application.

And ARP and RARP are their own protocol, seperate from TCP, UDP and ICMP.

 

[MBrown]

My professor said he disabled his and he doesn't get any spam or pop ups. And he said he can still send and recieve email. Its an Intro to Networking class just incase you all are wondering.

 

[Nothinman]

Ask for the steps he took, I'd be interested in knowing what he thinks controls UDP on his machine.

 

[MBrown]

I'll email him.

 

[xtknight]

Disabling the UDP protocol will break DNS and virtually every game on the system. I don't know how he gets spam via UDP unless the Messenger Service uses that, which should have been disabled within five minutes of Windows installation.

Originally posted by: Nothinman
TCP doesn't verify data either

A checksum and retransmit packets count as verifying, at least to a certain extent, don't they?

 

[jbritt1234]

Originally posted by: MBrown
I'll email him.

Can't wait to hear his response!

 

[Nothinman]

A checksum and retransmit packets count as verifying, at least to a certain extent, don't they?

The checksum will verfiy that the packet wasn't corrupted in transit, but it has no idea what the data is supposed to look like. The data could have very well be corrupted before transmit or after receive on either system. And retransmission will reasonably ensure that the packet got there, but not that the data in it is what it's supposed to be.

 

[xtknight]

Hmm...on further thought, how does it know when to retransmit?

 

[Nothinman]

Hmm...on further thought, how does it know when to retransmit?

Each packet is acknowledged by the remote side, if no ack is received in a certain amount of time the packet is retransmitted.

 

[GhettoFob]

If that's what he's teaching, I'd drop the class ASAP.

 

[MBrown]

Originally posted by: GhettoFob
If that's what he's teaching, I'd drop the class ASAP.

There are two classes left. lol

 

[Bob151]

Originally posted by: MBrown

Originally posted by: GhettoFob
If that's what he's teaching, I'd drop the class ASAP.

There are two classes left. lol

Ah, what college is this? Maybe the dean should know what his staff is teaching. This is just way off base.

I'm trying to give the guy the benefit of the doubt and think its something that rhyms with UDP, but I can't think of anything right now. Maybe he remembers the messenger service, which only ran on UDP 135, 137 and/or 138. This is not to be confused with MSN messenger. This messenger was mostly for corporate network to pass along global alerts, like "servers shutting down for maintenance in 5 minutes." MS finally got the clue and I think it is disabled by default in Windows XP.