network: cleanup NAT code and start on IPv6 support

network/bin/network.rs

@@ -5,15 +5,18 @@ use hyphanet::NetworkService;
 
 #[derive(Parser, Debug)]
 struct NetworkArgs {
-    #[arg(short, long, default_value = "192.168.42.1/24")]
-    network: String,
+    #[arg(long, default_value = "192.168.42.1/24")]
+    ipv4_network: String,
+
+    #[arg(long, default_value = "fe80::1/10")]
+    ipv6_network: String,
 }
 
 #[tokio::main]
 async fn main() -> Result<()> {
     env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init();
     let args = NetworkArgs::parse();
-    let mut service = NetworkService::new(args.network)?;
+    let mut service = NetworkService::new(args.ipv4_network, args.ipv6_network)?;
     service.watch().await?;
     Ok(())
 }