in src/lib.rs [208:216]
fn inet_v6() {
match interface_and_mtu(IpAddr::V6(Ipv6Addr::new(
0x2606, 0x4700, 0, 0, 0, 0, 0x6810, 0x84e5, // cloudflare.com
))) {
Ok(res) => assert_eq!(res, INET),
// The GitHub CI environment does not have IPv6 connectivity.
Err(_) => assert!(env::var("GITHUB_ACTIONS").is_ok()),
}
}