Home page logo
/

basics logo Security Basics mailing list archives

RE: How do I find out what hop is not forwarding traffic on a specific port?
From: "Billy Macdonald" <bmacdonald () crosscountry-auto com>
Date: Thu, 19 Nov 2009 19:53:45 -0500

From Linux you can do this.

traceroute -T -p 80 www.google.com 
traceroute -U -p 53 a.root-servers.net.

Note that the DNS one above seems to fail when it actually gets to the DNS server as it's not a valid packet and 
therefore discarded by the server.

Good Luck

-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Alex Fiuvertiz
Sent: Wednesday, November 18, 2009 3:11 PM
To: Phunkodelic
Cc: security-basics () securityfocus com
Subject: Re: How do I find out what hop is not forwarding traffic on a specific port?

Perhaps firewalk will solve that question? I'm not sure I completely
understood the problem, but if you're having a firewall/router in
front of a network and wants to map the firewall's rulebase than
perhaps firewalk could help.
But you will have to know a host on the inside network of the filtering devices.
The method will only work at level 3 firewalls/filtering devices.
You let firewalk calculate the TTL so that TTL is 1 when you get to
the firewall/router/filtering device. If the firewall is letting the
traffic through, the TTL will reach 0 and a ICMP message is returned.
If the fw is not letting the traffic through, the packet is simply
dropped.

/ Alex

2009/11/5 Phunkodelic <phunkodelic () gmail com>:
Looking for a way to find out who or what device is blocking traffic
on a specific port.  Sort of like a trace route tool where you could
designate the port to test with (UDP/TCP).  I realize that UDP may be
hard to do since it is a connectionsless protocol.

Anybody?  Thanks in advanced.

------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, 
how it benefits your company and how your customers can tell if a site is secure. You will find out how to test, 
purchase, install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for 
set-up are highlighted to help you ensure efficient ongoing management of your encryption keys and digital 
certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------



------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------


Confidentiality Note: This e-mail message and any attachments may contain 
confidential or privileged information. If you are not the intended recipient, 
please notify me immediately by replying to this message and destroy all 
copies of this message and any attachments. Thank you.

------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]