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
“Xenial Xerus” comes with a new packages format and several improvements for the enterprise.
Linux users can now download and install the Windows code editor
New initiative will address security and interoperability concerns around container technology.
Developers can use RHEL as a development platform without a subscription fee.
Windows users will soon have native access to the Bash shell.
Improvements to SMTP will provide better guarantee of confidentiality
Graphics vendor embraces new reality in Linux graphics
Pioneer Ray Tomlinson bequeathed the @ sign to billions of Internet users
Redmond says its classic database tool will run without Windows
New intrusion technique affects most non-Bluetooth wireless mice