I think there is a way to get local ip address via getifaddrs , then create IPV4Address / IPV6Address and get interface from it

Thanks @eskimo! Actually we have NEAppProxyTCPFlow object, from which we can get corresponding nw_interface_t (networkInterface), and then use nw_interface_get_name (description is also seems to work) to get the BSD interface name Thanks, Arkadi

Thanks @eskimo! One more question: Is there a way to create / retrieve NWInterface using the interface name? Thanks