Re: Which ports to block?

[VHP3 <vhp3 () cox net>]

The general rule is to block everything, then only allow what you need.  
In your case, only allow those three ports through.  You would 
especially want to block all the way up to 65535 because most, if not 
all, trojans use ports much higher than 1023.

Vince

Ferino Mardo wrote:

> In setting up a "deny all" rule from a firewall, is it safe to block
> ports 0 to 65535 or only up to 1023? My interest are only to allow port
> 53 udp, 25, and 80.
>
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Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off 
any course! All of our class sizes are guaranteed to be 10 students or less 
to facilitate one-on-one interaction with one of our expert instructors. 
Attend a course taught by an expert instructor with years of in-the-field 
pen testing experience in our state of the art hacking lab. Master the skills 
of an Ethical Hacker to better assess the security of your organization. 
Visit us at: 
http://www.infosecinstitute.com/courses/ethical_hacking_training.html
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