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CURLOPT_DNS_LOCAL_IP6(3)   Library Functions Manual   CURLOPT_DNS_LOCAL_IP6(3)

NAME
       CURLOPT_DNS_LOCAL_IP6 - IPv6 address to bind DNS	resolves to

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP6, char *address);

DESCRIPTION
       Set  the	local IPv6 address that	the resolver should bind to. The argu-
       ment should be of type char * and contain a single IPv6	address	 as  a
       string. Set this	option to NULL to use the default setting (do not bind
       to a specific IP	address).

       The  application	 does not have to keep the string around after setting
       this option.

       Using this option multiple times	makes the last set string override the
       previous	ones. Set it to	NULL to	disable	its use	again.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all supported	protocols

EXAMPLE
       int main(void)
       {
	 CURL *curl = curl_easy_init();
	 if(curl) {
	   CURLcode res;
	   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
	   curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP6, "fe80::a9ff:fe46:b619");
	   res = curl_easy_perform(curl);
	   curl_easy_cleanup(curl);
	 }
       }

NOTES
       This option requires that libcurl was built  with  a  resolver  backend
       that supports this operation. The c-ares	backend	is the only such one.

AVAILABILITY
       Added in	curl 7.33.0

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_DNS_INTERFACE(3),	 CURLOPT_DNS_LOCAL_IP4(3),	  CUR-
       LOPT_DNS_SERVERS(3)

libcurl				  2025-06-03	      CURLOPT_DNS_LOCAL_IP6(3)

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