Merge pull request #3 from rvbcldud/fix-ipv4-compatability

Changed Ipv4-compatible to Ipv4-mapped addresses

Author: rushmorem

src/lib.rs

@@ -53,10 +53,10 @@ pub fn ip(name: &str, net: IpNetwork) -> Result<IpAddr> {
                 return Err(Error::PrefixTooBig(net));
             }
             let prefix = IP6_PREFIX - IP4_PREFIX + net4.prefix();
-            let net6 = format!("::{}/{prefix}", net4.ip()).parse::<Ipv6Network>()?;
+            let net6 = format!("::ffff:{}/{prefix}", net4.ip()).parse::<Ipv6Network>()?;
             let ipv6_addr = ip6(name, net6)?.to_string();
             let ip_addr = ipv6_addr
-                .strip_prefix("::")
+                .strip_prefix("::ffff:")
                 // This error should never happen but I'm not a fan of panicking in libraries
                 .ok_or_else(|| Error::InvalidIpNetwork(format!("[BUG] the generated IPv6 address `{ipv6_addr}` does not start with the expected prefix `::`")))?
                 .parse()