Cisco RV042 Administration Guide - Page 162

Glossary A 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. Setting 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. However, 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 802.11b standard requires adding a preamble to every frame before it is transmitted through the air. The traditional long preamble requires 192 μs for transmission. A short preamble requires only 96 μs. A long preamble is needed for compatibility with the legacy 802.11 systems operating at 1 and 2 Mbps. Cisco RV220W Administration Guide 162