FTP. File Transfer Protocol. Application protocol that lets one IP node trans- fer files to and from another node.
FTP server. Host on network from which clients can transfer files.
Hard MBytes. Setting the Hard MBytes parameter forces the renegotiation of the IPSec Security Associations (SAs) at the configured Hard MByte value.
The value can be configured between 1 and 1,000,000 MB and refers to data traffic passed.
Hard Seconds. Setting the Hard Seconds parameter forces the renegotia- tion of the IPSec Security Associations (SAs) at the configured Hard Seconds value. The value can be configured between 60 and 1,000,000 seconds.
A tunnel will start the process of renegotiation at the soft threshold and renegotiation must happen by the hard limit or traffic over the tunnel is ter- minated.
hardware handshake. Method of flow control using two control lines, usu- ally Request to Send (RTS) and Clear to Send (CTS).
header. The portion of a packet, preceding the actual data, containing source and destination addresses and
HMAC.
hop. A unit for measuring the number of routers a packet has passed through when traveling from one network to another.
hop count. Distance, measured in the number of routers to be traversed, from a local router to a remote network. See metric.
hub. Another name for a repeater. The hub is a critical network element that connects everything to one centralized point. A hub is simply a box with mul- tiple ports for network connections. Each device on the network is attached to the hub via an Ethernet cable.
