Specify which of my machine's IP4 or IP6 addresses is to be used for a curl request My linux box has 3 IP4 addresses and a range of IP6 addresses. Supposing I wish to make a `curl` fetch, how to stipulate from _which_ address the request emanates? Note: I'm actually using Python/PyCurl, however I'm interested in both bash+curl and curl-only solutions. If curl-only I can implement with PyCurl. If bash+curl, I can rewrite my code in bash.

Do you mean the ` --interface` option? From `man curl`:

> \--interface
>
> Perform an operation using a specified interface. You can enter interface name, IP address or host name. An example could look like:
>
> curl --interface eth0:1 <
>
> If this option is used several times, the last one will be used.

Note that you may also use a specific DNS interface.