Security Basics mailing list archives
RE: TCP vs UDP
From: "Clint Harris" <clinton.harris () peace com>
Date: Tue, 12 Nov 2002 11:16:12 +1300
When should you block a TCP and UDP port ??? Depends what application you are using. e.g. As per all that other email banter DNS uses tcp & udp but standard HTTP uses tcp/80, SMTP tcp/25, IPSec udp/500 ip50/51 and sometimes a TCP or UDP wrapper port, HTTPS tcp/443 etc etc You'll have to figure out what application you want to allow access or deny access to and open/block the relevant ports/protocols. TCP = connection orientated i.e. the transmitting machines shake hands and make sure that all data is transmitted UDP = connectionless i.e. the sending party just sends data and "hopes" that everything gets there. If you don't need it, block it. -----Original Message----- From: Roberto Ramsis [mailto:robertoramsis () hotmail com] Sent: Friday, November 08, 2002 11:23 PM To: security-basics () securityfocus com Subject: TCP vs UDP hello thanks to everyone who replied to my last msg what's the difference between a port TCP and UDP? i am talking from a firewall concept,i want to know ,if i need to block a port,when should i block TCP and when UDP and when both? Thanks in advance _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
Current thread:
- TCP vs UDP Roberto Ramsis (Nov 09)
- Re: TCP vs UDP Xaos (Nov 11)
- RE: TCP vs UDP Clint Harris (Nov 12)
- AW: TCP vs UDP Robert Sieber (Nov 13)
- <Possible follow-ups>
- RE: TCP vs UDP Gene LeDuc (Nov 12)
- Re: TCP vs UDP Gene (Nov 14)
- Re: TCP vs UDP Chris Berry (Nov 12)
- RE: TCP vs UDP Roberto Ramsis (Nov 12)
- RE: TCP vs UDP Mike Cain (Nov 13)
- Re: TCP vs UDP Arvind Shyamsundar (Nov 13)
- Re: TCP vs UDP jnf (Nov 14)