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Oracle Solaris Tunable Parameters Reference Manual Oracle Solaris 10 8/11 Information Library |
1. Overview of Oracle Solaris System Tuning
2. Oracle Solaris Kernel Tunable Parameters
4. Internet Protocol Suite Tunable Parameters
Where to Find Tunable Parameter Information
Overview of Tuning IP Suite Parameters
Internet Request for Comments (RFCs)
ip_icmp_err_interval and ip_icmp_err_burst
ip_respond_to_echo_broadcast and ip6_respond_to_echo_multicast
ip_send_redirects and ip6_send_redirects
ip_forward_src_routed and ip6_forward_src_routed
ip_strict_dst_multihoming and ip6_strict_dst_multihoming
IP Tunable Parameters With Additional Cautions
ip_icmp_return_data_bytes and ip6_icmp_return_data_bytes
TCP/IP Parameters Set in the /etc/system File
TCP Parameters With Additional Cautions
5. Network Cache and Accelerator Tunable Parameters
A. Tunable Parameters Change History
Defines the default maximum UDP socket datagram size. For more information, see udp_max_buf.
57,344 bytes
1,024 to 1,073,741,824 bytes
Yes
Note that an application can use setsockopt(3XNET) SO_SNDBUF to change the size for an individual socket. In general, you do not need to change the default value.
Unstable
Defines the default maximum UDP socket receive buffer size. For more information, see udp_max_buf.
57,344 bytes
128 to 1,073,741,824 bytes
Yes
Note that an application can use setsockopt(3XNET) SO_RCVBUF to change the size for an individual socket. In general, you do not need to change the default value.
Unstable
This parameter controls the smallest port number UDP can select as an ephemeral port. An application can use an ephemeral port when it creates a connection with a specified protocol and it does not specify a port number. Ephemeral ports are not associated with a specific application. When the connection is closed, the port number can be reused by a different application.
Port number
32,768
1,024 to 65,534
Yes
When a larger ephemeral port range is required.
Unstable
For information, see [tcp,sctp,udp]_smallest_anon_port and [tcp,sctp,udp]_largest_anon_port (Solaris 10 Releases).
This parameter controls the largest port number UDP can select as an ephemeral port. An application can use an ephemeral port when it creates a connection with a specified protocol and it does not specify a port number. Ephemeral ports are not associated with a specific application. When the connection is closed, the port number can be reused by a different application.
Port number
65,535
1,024 to 65,535
Yes
When a larger ephemeral port range is required.
Unstable
For information, see [tcp,sctp,udp]_smallest_anon_port and [tcp,sctp,udp]_largest_anon_port (Solaris 10 Releases).
This parameter controls whether UDP calculates the checksum on outgoing UDP/IPv4 packets.
1 (enabled)
0 (disabled) or 1 (enabled)
Yes
Do not change this parameter.
Unstable
For information, see udp_do_checksum (Solaris 10 Releases).
Changing the following parameter is not recommended.
Controls how large send and receive buffers can be for a UDP socket.
2,097,152 bytes
65,536 to 1,073,741,824 bytes
Yes
Do not change the value. If this parameter is set to a very large value, UDP socket applications can consume too much memory.
Unstable