tcp_wscale_always (Solaris 9 Releases)

The default value of this parameter was changed to enabled in the Solaris 10 release.

Description

When this parameter is enabled, which is the default setting, TCP always sends a SYN segment with the window scale option, even if the window scale option value is 0. Note that if TCP receives a SYN segment with the window scale option, even if the parameter is disabled, TCP responds with a SYN segment with the window scale option. In addition, the option value is set according to the receive window size.

Refer to RFC 1323 for the window scale option.

Default

0 (disabled)

Range

0 (disabled) or 1 (enabled)

Dynamic?

Yes

When to Change

If there is an interoperability problem with an old TCP stack that does not support the window scale option, disable this parameter.

Commitment Level

Unstable