Security testing with hping
Firewalls and Session State
Suppose you want to determine how well your firewall is able to record requests for Microsoft protocols across the network. To use hping3 to generate the packets for this test, issue the following commands:
hping www.acme.net -S -c 1 -p 139 hping www.acme.net -S -A -c 1 -p 139 hping www.acme.net -S -A -c 1 -p 135
These commands generate packets that the firewall – if its capability for maintaining state is working – will record. To verify this, you'll need to check the firewall's logs and use a packet sniffer.
Christmas Tree Packet
A Christmas tree packet  is a TCP packet that has almost every flag set, which is useful for bypassing firewalls and for launching various other forms of attack.
To create a Christmas tree packet using hping3, issue the following command:
hping3 -F -P -U 10.44.45.15 -p 0
Firewalls and Time Stamps
In many cases, a firewall will automatically drop packets that don't have a time stamp. To add a time stamp to your packets, use the -timestamp option in your command:
hping3 -S 18.104.22.168 -p 80 --tcp-timestamp
The results will help you determine whether you need to enable timestamp filtering on the firewall.
Buy this article as PDF
News site for the openSUSE community falls victim to a Wordpress exploit.
The source code is available online.
One out of three virtual machines on Microsoft Azure Cloud run Linux.
The form factor of the board makes it a drop-in replacement for Raspberry Pi.
Makes it easier for customers to move workloads into container-centric applications.
SUSE’s answer to container-centric operating systems.
Linux 4.9 is the biggest release in terms of number of commits.
The latest version of the official RHEL clone is here.
New release targets Linux professionals.
The Fedora project adds Wayland and Gnome 3.22