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Transcript
Appendix - G
SENS
 Wind River Systems, Inc. 1997
SENS




G-2
“Scalable Enhanced Network Stack”
Modular driver/stack interface
 Enhanced Network Driver (END) supports polled network
drivers and multicasting.
 New layer (MUX) provides a protocol-independent interface
to the network driver.
Upgrade to 4.4 BSD codebase
Many scalability options
Contemporary Internet Features
Contd...
G-3
Scalability

Include/exclude protocols individually (TCP, UDP, ICMP,
IGMP)

Flexible configuration control of network stack default behavior
(see netLib.h)

Tight control of network memory buffer pool configuration(see
netBufLib and usrNetwork.c)
G-4
Contemporary Internet Features

Dynamic Host Configuration Protocol (DHCP)

Routing Information Protocol (RIP)

Open Shortest Path First (OSPF) available as an optional
component

IP Multicasting

Resolver (client) for DNS (Domain Name Service)

Simple Network Time Protocol (SNTP)
G-5
DHCP


G-6
Extends features provided by BOOTP
 Manual configuration for backward compatibility with
BOOTP
 Automatic configuration to assign a dynamically allocated
IP address
 Assignment may be temporary: Address “leased” to a client
for a limited time.
SENS supports DHCP client, server and relay agent operation
Routing

Manual routing configuration with calls in routeLib to support
specification of subnet mask for a destination

RIP (Routing Information Protocol) client and server support

OSPF (Open Shortest Path First) support available at extra cost
G-7
IP Multicasting

Allows more efficient transmission of data to multiple
destinations than broadcasting.

Uses class D network addresses 224.0.0.0 through
239.255.255.255

Consumers join a “multicast group.” All other hosts will be
unaffected by the transmission.
G-8
DNS Resolver

DNS (Domain Name Service) is a system which provides
automatic conversion between host names and IP addresses. See
hostAdd() for manual mapping of names to IP addresses.

Define INCLUDE_DNS_RESOLVER in config.h

Set the macros RESOLVER_DOMAIN_SERVER and
RESOLVER_DOMAIN appropriately

Resolver operation is fully integrated. (hostGetByName() and
hostGetByAddr() have been updated to use the resolver. Other
library routines, for example ping() and rcmd(), use these.)
G-9
SNTP Client & Server

Simple Network Time Protocol

Define INCLUDE_SNTPC for client support and
INCLUDE_SNTPS for server support in config.h

sntpcTimeGet() is the basic client call

Server requires a user provided function of the form
STATUS sntpsTimeHook (int request, void *pNtpTime)
Other library routines will set the request parameter to
SNTPS_TIME to retrieve the current 64-bit NTP
timestamp. See documentation for sntpsClockSet().
G-10