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.
1 FTP server: Sends an âOKâ from its TCP port 21 to the FTP clientâs TCP port 6000 (the command channel link). The command channel is established at this point.  FTP client: Sends a data request (PORT command) to the FTP server. The FTP client includes in the PORT command the data port number it opened to receive data.