TCP/IP Configuration and Management Manual

NonStop TCP/IP Processes and Protocols
TCP/IP Configuration and Management Manual—427132-004
B-16
NonStop TCP/IP Subsystem Processes

LISTNER Process

NonStop TCP/IP Protocols

Transmission Control Protocol (TCP)

User Datagram Protocol (UDP)

Internet Protocol (IP)

Internet Control Message Protocol (ICMP)

Address Resolution Protocol (ARP)

Subnetwork Access Protocol (SNAP)

File Transfer Protocol (FTP)

Trivial File Transfer Protocol (TFTP)

Simple Mail Transfer Protocol (SMTP)

ECHO Server/Client

FINGER Server/Client

Other Services

TN6530 Emulation Utility

Socket Programmatic Interface (BSD 4.3)

Domain Name Server (DNS)

Domain Name Resolver
The terms client and server are used here as they are customarily used in TCP/IP
literature. A server accepts requests, performs specified services, and returns results
to the requesters over the network. A client sends requests to the server and waits for
the server to respond. The client-server model is the same model known as the
requester-server model in other documentation for NonStop systems. A client is the
same as a requester.
NonStop TCP/IP Subsystem Processes
The NonStop TCP/IP subsystem processes are described in detail in the paragraphs
that follow. NonStop TCP/IP software conforms to the RFCs, IENs, and MIL-STDs that
define those protocols implemented. The descriptions that follow specifically point out
any nonconformance to the protocols and standards required by the NonStop
operating system.
The NonStop TCP/IP subsystem is composed of both servers and clients
(Figure B-10
). A client is a process that sends requests to the server and waits for a
response. A server is a process that offers a service that can be used over the