Cisco Small Business RV220W Administration Manual page 225

Glossary
Cisco RV220W Administration Guide
Term
Fragmentation Threshold
IKE (Internet Key
Exchange)
MTU (Maximum
Transmission Unit)
Network Address
Translation (NAT)
Preamble Mode
Definition
The frame length, in bytes, that requires packets
to be fragmented into two or more frames. Set-
ting a lower value can reduce collisions, which
occur more often in the transmission of long
frames. You may need to use a lower setting in
areas where communication is poor or where
there is a great deal of radio interference. How-
ever, setting the fragmentation threshold too
low may result in poor network performance.
The Internet Key Exchange (IKE) protocol
dynamically exchanges keys between two
IPsec hosts.
The largest packet that can be sent over the
network.
Network Address Translation (NAT) is a
technique that allows several endpoints on a
LAN to share an Internet connection. In this
scenario, the computers on the LAN use a
"private" IP address range while the WAN port
on the router is configured with a single "public"
IP address. The router translates the internal
private addresses into a public address, hiding
internal IP addresses from computers on the
Internet.
The 802. 1 1b standard requires adding a pream-
ble to every frame before it is transmitted
through the air. The traditional long preamble
requires 192 μs for transmission. A short pream-
ble requires only 96 μs. A long preamble is
needed for compatibility with the legacy 802. 1 1
systems operating at 1 and 2 Mbps.
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