TCP/IP Configuration and Management Manual

Overview of NonStop TCP/IP
TCP/IP Configuration and Management Manual—427132-004
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ATM Term Definitions
ATM Term Definitions
The following terms are used throughout this manual in reference to ATM.
ATMARP Table
The TCP/IP process maintains a table of ATM IP addresses in an ATMARP table.
Similar to the ARP table TCP/IP uses to map an IP address to a MAC address in
Ethernet and token-ring networks, TCP/IP uses the ATMARP table to map IP
addresses to an ATM address in ATM networks. You can view and change the
ATMARP table.
ATMARP Server
An ATMARP server is a process used by other ATM endpoints to resolve IP to ATM
addresses.
ATM Address Table
The ATM address table stores current Permanent Virtual Circuit (PVC) and Switched
Virtual Circuit (SVC) connection information. See PVC and SVC below. You can view,
but not change, the ATM address table.
Endpoint
Endpoint has two definitions:

A unique 32-bit value assigned to an ATM address entry

A device on a network
PVC
A PVC is a logical connection between network entities permanently maintained by the
ATM network. NonStop TCP/IP does not support a PVC connection to an ARP server.
SVC
An SVC is a logical connection between network entities established for the duration of
the communication and then destroyed.
RFC Compliance
The default IP MTU size for ATM type SUBNETs is 9180 bytes. The TCP/IP process
supports IP Path MTU discovery (RFC-1191) on TCP connections but does not support
Path MTU discovery for UDP type sockets.
The following are some possible differences between the IETF standards and NonStop
TCP/IP: