The nerve roots pass through these joints to go from the spinal cord to the arms, legs and other parts of the body. These joints also allow the spine to bend and twist, and they keep the back from slipping too far forward or twisting without limits.
A forward ftp proxy is used to allow internal LAN clients to connect to Internet ftp servers when connecting through a PF firewall. All control and data connection rules are made by the ftp-proxy daemon and inserted into PF using anchors.
The WatchGuard System Manager includes an FTP packet filter and an FTP Proxy. The FTP packet filter can handle both active and passive FTP sessions without any special client configuration. In active mode FTP, the FTP server establishes the data connection. In passive mode, the client establishes the connection.