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curl/docs/cmdline-opts/interface.d

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+Long: interface
+Arg: <name>
+Help: Use network INTERFACE (or address)
+See-also: dns-interface
+Category: connection
+---
+
+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 https://www.example.com/
+
+If this option is used several times, the last one will be used.
+
+On Linux it can be used to specify a VRF, but the binary needs to either
+have CAP_NET_RAW or to be run as root. More information about Linux VRF:
+https://www.kernel.org/doc/Documentation/networking/vrf.txt