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Category Archives: Networking
Tcpdump usage examples
In most cases you will need root permission to be able to capture packets on an interface. Using tcpdump (with root) to capture the packets and saving them to a file to analyze with Wireshark (using a regular account) is … Continue reading
Posted in Linux How-To, Networking, News and Security, Windows How-To
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USB Rubber Ducky | USB Rubber Ducky
I want one of these 🙂
Posted in Networking, News and Security
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Hak5 – Building a high performance home router
This was a pretty cool setup.
Posted in Networking
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Setting Up a FreeBSD Router, Step-by-Step
HARDWARE INFO: rl0 – NIC facing the 192.168.0.0 network xl0 – NIC facing the 192.168.1.0 network xl1 – NIC facing the modem tun0 – The virtual NIC used by PPP, facing the outside SECTION 1: PRELIMINARY SETUP Install FreeBSD Enable … Continue reading
Posted in Linux How-To, Networking
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Nagios NRPE example setup
Ubuntu #> apt-get install nagios-nrpe-server nagios-nrpe-plugin CentOS and Fedora #> yum install nrpe nagios-plugins-load nagios-plugins-users nagios-plugins-swap nagios-plugins-disk #> chkconfig –add nrpe FreeBSD #> cd /usr/ports/net-mgmt/nrpe* #> make #> make install clean #> In /etc/nagios/nrpe.cfg Set the following dont_blame_nrpe=1 (default set … Continue reading
Posted in Linux How-To, Networking
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Block Port 25 with IPTables
Block all port 25 except from localhost -A INPUT -p tcp -s localhost –dport 25 -j ACCEPT -A INPUT -p tcp –dport 25 -j DROP
Posted in Linux How-To, Networking
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Subnet Mask Cheat Sheet
Addresses Hosts Netmask Amount of a Class C /30 4 2 255.255.255.252 1/64 /29 8 6 255.255.255.248 1/32 /28 16 14 255.255.255.240 1/16 /27 32 30 255.255.255.224 1/8 /26 64 62 255.255.255.192 1/4 /25 128 126 255.255.255.128 1/2 /24 256 … Continue reading
Posted in Networking
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