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Properties : D.10 Ice Transport Properties
Copyright © 2003-2010 ZeroC, Inc.

D.10 Ice Transport Properties

Ice.IPv4

Synopsis

Ice.IPv4=num

Description

Specifies whether Ice uses IPv4. If num is a value greater than zero, IPv4 is enabled. If not specified, the default value is 1.

Ice.IPv6

Synopsis

Ice.IPv6=num

Description

Specifies whether Ice uses IPv6. If num is a value greater than zero, IPv6 is enabled. If not specified, the default value is zero.

Ice.TCP.Backlog

Synopsis

Ice.TCP.Backlog=num

Description

Specifies the size of the listen queue for each TCP or SSL server endpoint. If not defined, the default value for C++ programs uses the value of SOMAXCONN if present, or 511 otherwise. In Java and .NET, the default value is 511.

Ice.TCP.RcvSize
Ice.TCP.SndSize

Synopsis

Ice.TCP.RcvSize=num
Ice.TCP.SndSize=num

Description

These properties set the TCP receive and send buffer sizes to the specified value in bytes. The default value depends on the configuration of the local TCP stack. (A common default values is 65535 bytes.)
The OS may impose lower and upper limits on the receive and send buffer sizes or otherwise adjust the buffer sizes. If a limit is requested that is lower than the OS‑imposed minimum, the value is silently adjusted to the OS‑imposed minimum. If a limit is requested that is larger than the OS‑imposed maximum, the value is adjusted to the OS‑imposed maximum; in addition, Ice logs a warning showing the requested size and the adjusted size.

Ice.UDP.RcvSize
Ice.UDP.SndSize

Synopsis

Ice.UDP.RcvSize=num
Ice.UDP.SndSize=num

Description

These properties set the UDP receive and send buffer sizes to the specified value in bytes. Ice messages larger than num  28 bytes cause a DatagramLimitException. The default value depends on the configuration of the local UDP stack. (Common default values are 65535 and 8192 bytes.)
The OS may impose lower and upper limits on the receive and send buffer sizes or otherwise adjust the buffer sizes. If a limit is requested that is lower than the OS‑imposed minimum, the value is silently adjusted to the OS‑imposed minimum. If a limit is requested that is larger than the OS‑imposed maximum, the value is adjusted to the OS‑imposed maximum; in addition, Ice logs a warning showing the requested size and the adjusted size.
Settings of these properties less than 28 are ignored.
Note that, on many operating systems, it is possible to set buffer sizes greater than 65535. Such settings do not change the hard limit of 65507 bytes for the payload of a UDP packet, but merely affect how much data can be buffered by the kernel.
Settings less than 65535 limit the size of Ice datagrams as well as adjust the kernel buffer sizes.

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