- **status**: open --> closed-accepted
- **assigned_to**: Daniel Stenberg
- **Group**: -->

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** [feature-requests:#68] Make CURLOPT_INTERFACE affect DNS requests too (where possible)**
**Status:** closed-accepted
**Created:** Fri Feb 08, 2013 08:58 PM UTC by Kim Vandry
**Last Updated:** Fri Feb 08, 2013 08:58 PM UTC
**Owner:** Daniel Stenberg
I am using curl_easy_setopt(CURLOPT_INTERFACE, "if!something") to force transfers to use a particular interface but this doesn't make DNS requests use that interface.
I think most users would expect use of CURLOPT_INTERFACE to affect all network traffic generated by the transfer including DNS requests.
If c-ares is in use, this is actually easy to implement. With the attached patch, when using CURLOPT_INTERFACE, DNS requests are also bound to the specified interface. If c-ares is not in use or if the c-ares version is too old to support this, the behaviour is the same as it is now. I could have made it fail with CURLE_NOT_BUILT_IN but I don't think that's a good idea.
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