Solved

Port scan firewall with NMAP

Posted on 2014-09-14
2
505 Views
Last Modified: 2014-09-18
When auditing the public-facing side of a firewall, is there an appropriate/recommended range of ports to scan? We're using NMAP. By default, an intense scan only scans the first 1000 ports. Seems pretty limited. Does anyone have a strong opinion or some professional experience regarding this? Should we scan UDP and TCP? Any example NMAP lines?

Thanks!
0
Comment
Question by:meade470
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 62

Assisted Solution

by:gheist
gheist earned 200 total points
ID: 40322537
You should scan all ports if you are at it. Just make sure you disable rate-limiting and/or port scan detection for your scanning IP.
Normally you allow just few public-facing services, so nothing more should appear.
0
 
LVL 2

Accepted Solution

by:
vpnttg earned 300 total points
ID: 40322777
TCP: nmap -sS -p 0-65535 <IP address>
UDP: nmap -sU -p 0-65535 <IP address>
0

Featured Post

Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

With the rising number of cyber attacks in recent years, keeping your personal data safe has become more important than ever. The tips outlined in this article will help you keep your identitfy safe.
Let's recap what we learned from yesterday's Skyport Systems webinar.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
Suggested Courses
Course of the Month8 days, 14 hours left to enroll

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question