Monkeybread Software - MBS FileMaker Plugin: CURL.SetOptionDNSShuffleAddresses

Topics All Mac OS X (Only) Windows (Only) Linux (Only, Not) iOS (Only, Not)
Components Crossplatform Mac & Win Server Client Old Guides Examples
New in version: 7.2 7.3 7.4 7.5 8.0 8.1 8.2 8.3 8.4 8.5 Statistic

CURL.SetOptionDNSShuffleAddresses

Whether to shuffle DNS addresses.

Component	Version	macOS	Windows	Server	FileMaker Cloud	FileMaker iOS SDK
CURL	8.2	Yes	Yes	Yes	Yes	Yes

MBS( "CURL.SetOptionDNSShuffleAddresses"; curl; Value ) More

Parameters

Parameter Description Example value

curl The CURL session handle. $curl

Value The new setting, 1 or 0 1

Parameter	Description	Example value
curl	The CURL session handle.	$curl
Value	The new setting, 1 or 0	1

Result

Returns OK or error.

Description

Whether to shuffle DNS addresses.
When a name is resolved and more than one IP address is returned, shuffle the order of all returned addresses so that they will be used in a random order. This is similar to the ordering behavior of gethostbyname which is no longer used on most platforms.

Addresses will not be reshuffled if a name resolution is completed using the DNS cache. CURL.SetOptionDNSCacheTimeout can be used together with this option to reduce DNS cache timeout or disable caching entirely if frequent reshuffling is needed.

Since the addresses returned will be reordered randomly, their order will not be in accordance with RFC 3484 or any other deterministic order that may be generated by the system's name resolution implementation. This may have performance impacts and may cause IPv4 to be used before IPv6 or vice versa.
Default is 0.

See also DNS_SHUFFLE_ADDRESSES option in CURL manual.