3. Default Parameters

Table 3.1 shows the default NPAP parameters used for each ERD. It details the parameter name, the default value, a description of the parameter, and whether the parameter is changeable during runtime. If your ERD uses different values it is noted in the section NPAP ERD Overview.

Table 3.1 Default ERD Parameters

Parameter	Default Value	Parametrization at	Description
Maximum Frame Size	9000	Compile Time	Maximum Ethernet Frame Size
TCP TX Max Segment Size	8 KiB	Compile Time	Maximum transmit TCP segment sizes
TCP RX Max Segment Size	8 KiB	Compile Time	Maximum receive TCP segment size
UDP TX Max Datagram Size	1472	Compile Time	Maximum transmit UDP datagram size in Byte
UDP RX Max Datagram Size	1472	Compile Time	Maximum receive UDP datagram size in Byte
TCP RX Buffer Size	128 KiB	Compile Time	TCP buffer in Kibibytes in the RX path.
TCP TX Buffer Size	128 KiB	Compile Time	TCP buffer in Kibibytes in the TX path.
UDP RX Buffer Size	32 KiB	Compile Time	UDP buffer size in Byte in the RX path.
UDP TX Buffer Size	32 KiB	Compile Time	UDP buffer size in Byte in the TX path.
TCP RX Max Frame Number	4 KiB	Compile Time	Maximum Number of TCP segments in the TCP RX buffer.
TCP TX Max Frame Number	4 KiB	Compile Time	Maximum Number of TCP segments in the TCP TX buffer.
UDP RX Max Frame Number	4 KiB	Compile Time	Maximum Number of UDP datagrams in the UDP RX buffer.
UDP TX Max Frame Number	4 KiB	Compile Time	Maximum Number of UDP datagrams in the UDP TX buffer.
DGC Enable	True	Compile Time	Enable DGC in TCP/UDP Wrappers
Impairment RX Enable	True	Compile Time	Enable possibility to insert bit error rate into RX path.
Impairment TX Enable	True	Compile Time	Enable possibility to insert bit error rate into TX path.
Priority Manager Enable	True	Compile Time	Enable possibility to prioritize TCP session data streams.
ICMPv4 Enable	True	Compile Time	Enable possibility to ping ERD
IGMPv4 Enable	False	Compile Time	Enable multicast group management.
Subnet Mask	255.255.0.0	Run Time	Default Subnet Mask of an NPAP instance
TCP ports	50000 + x	Run Time	Default TCP ports, at which a passive loopback session is open on default, see TCP Loopback. x denotes the index of the TCP Wrapper.
UDP ports	55000 + x	Run Time	Default UDP ports, can be used to test UDP connection, see UDP Loopback x denotes the index of the TCP Wrapper.
Netperf Control Session Port	12865	Run Time	This is the default port a software Netperf client expects.
Netperf Test Session Port	12866	Run Time	This is the default port a software Netperf client expects.