network interface
How to Configure Oracle 9i server behind a firewall with NAT
You want to put your Oracle 9i server (“planb” at 10.10.2.9) behind a NAT router, and access it from outside the router (any client in 128.100.31.0/24). +——–+ public +————–+ private +—————-+ | client |——–| firewall+nat |———| oracle (planb) | +——–+ +————–+ +—————-+ I assume your router already has: FreeBSD 4 options IPDIVERT and options IPFIREWALL [...]
How to Assign Virtual IPs to your NIC
A virtual IP address (VIP or VIPA) is an IP address that is not connected to a specific computer or network interface card (NIC) on a computer. Incoming packets are sent to the VIP address, but all packets travel through real network interfaces. VIPs are mostly used for connection redundancy; a VIP address may still [...]
How to use Tcpdump Command In Linux
The tcpdump command prints out the headers of packets on a network interface that match the boolean expression. It can also be run with the -w flag, which causes it to save the packet data to a file for later analysis. It can also be run with the -r flag, which causes it to read from a saved packet file rather [...]
How to Capture Linux network packets to a file
tcpdump command dump traffic on a network in real time. It prints out a description of the contents of packets on a network interface. By default traffic is dumped on a screen. To capture these packets to a file, enter the following command as the root user: # tcpdump -i eth0 -w traffic.eth0 The -w flag causes it [...]
How to install and Configure Smoothwall Express 3 Firewall
The SmoothWall GPL project was founded in the summer of 2000 by Lawrence Manning (Principle Code Author) and Richard Morrell (Project Manager). Their goal was to create a Linux distribution that could convert a redundant PC into a hardened internet firewall device. With help from other early contributors; John Faulty and Tom Ellils, the first SmoothWall Firewall was posted to sourceforge.net at the end of August 2000.
The project was immediately popular and grew rapidly. Within weeks, thousand of copies had been downloaded and SmoothWall was appearing regularly on magazine cover CDs in the UK and overseas. Many more developers joined the team and new versions were released almost weekly, incorporating new features based on software contributions from all round the world.