telnet problem using "."

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curlopt_dns_servers

CURLOPT_DNS_SERVERS(3)					     curl_easy_setopt options					    CURLOPT_DNS_SERVERS(3)

NAME

       CURLOPT_DNS_SERVERS - set preferred DNS servers

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers);

DESCRIPTION

       Pass a char * that is the list of DNS servers to be used instead of the system default.	The format of the dns servers option is:

       host[:port][,host[:port]]...

       For example:

       192.168.1.100,192.168.1.101,3.4.5.6

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

DEFAULT

       NULL - use system default

PROTOCOLS

       All

EXAMPLE

       TODO

AVAILABILITY

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

       Added in 7.24.0

RETURN VALUE

       Returns	CURLE_OK  if  the  option  is  supported, CURLE_UNKNOWN_OPTION if not, CURLE_NOT_BUILT_IN if support was disabled at compile-time,
       CURLE_BAD_FUNCTION_ARGUMENT when given an invalid server list, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO

       CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_CACHE_TIMEOUT(3),

libcurl 7.54.0							 December 21, 2016					    CURLOPT_DNS_SERVERS(3)

IP Networking