fix(portmapper): UPNP use 2hours as lease duration

Fixes #52

Author: dignifiedquire

portmapper/src/upnp.rs

@@ -16,8 +16,8 @@ pub type Gateway = aigd::Gateway<aigd::tokio::Tokio>;
 
 use crate::{Protocol, defaults::UPNP_SEARCH_TIMEOUT as SEARCH_TIMEOUT};
 
-/// Seconds we ask the router to maintain the port mapping. 0 means infinite.
-const PORT_MAPPING_LEASE_DURATION_SECONDS: u32 = 0;
+/// Seconds we ask the router to maintain the port mapping. Use 2 hours for now.
+const PORT_MAPPING_LEASE_DURATION_SECONDS: u32 = 2 * 60 * 60;
 
 /// Tailscale uses the recommended port mapping lifetime for PMP, which is 2 hours. So we assume a
 /// half lifetime of 1h. See <https://datatracker.ietf.org/doc/html/rfc6886#section-3.3>