Chapter 6 • IP features
1037852-0001 Revision A
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algorithm and stateful compression; that is, compression is
applied across multiple packets at a time to take advantage of the
greater data redundancy available across multiple packets, and
consequent greater compression ratios. Compression ratios of up
to 12:1 are achieved. PEP compression can be enabled on
individual PEP connections.
TurboPage TurboPage web acceleration uses the HTTP performance
enhancing proxy (HPEP) to increase the speed of web page
loading. This feature consists of a TurboPage server at the
gateway and a TurboPage client in the satellite router. The server
and client maintain a persistent TCP connection across the
satellite link, and all HTTP/TCP requests are multiplexed across
this connection.
The TurboPage feature parses HTML documents and HTTP
responses, and fetches a subset of the referenced uniform
resource locators (URLs), and forwards the information over the
satellite link. The default behavior forwards embedded images,
embedded HTML frames, cascading style sheets, and JavaScript
URLs of moderate size, with the maximum prefetched size
configurable for each kind of URL.
IP packet delivery
prioritization
Inroute prioritization uses five queues to which users can map
traffic with special handling for constant bit rate (CBR) traffic,
such as real-time transport protocol (RTP) and facsimile. One
queue is reserved for CBR traffic, and the other four queues carry
PEP and non-PEP traffic, based on priority configurations. The
packets from the CBR queue are transmitted before packets from
any of the priority queues. Users can map PEP classes of service
and non-PEP traffic to one of the four priority queues.
Packet delivery prioritization is based on:
• Source IP address range
• Destination IP address range
• TCP /UDP port number
• Diffserv code point (DSCP) bits
NAT/PAT
HX System satellite routers support network address translation
(NAT) and port address translation (PAT), allowing translation of
IP addresses from the local LAN to global or external addresses.
Note: PAT is sometimes referred to as NAPT, for Network
Address Port Translation.
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