support win7 and reduce win mem usage (#128)

easytier/Cargo.toml

@@ -85,7 +85,7 @@ http = { version = "1", default-features = false, features = [
 tokio-rustls = { version = "0.26", default-features = false, optional = true }
 
 # for tap device
-tun = { version = "0.6.1", features = ["async"] }
+tun = { git = "https://github.com/EasyTier/rust-tun.git", features = ["async"], rev = "e4fd1cd" }
 # for net ns
 nix = { version = "0.27", features = ["sched", "socket", "ioctl"] }
 

easytier/src/instance/virtual_nic.rs

@@ -289,6 +289,12 @@ impl VirtualNic {
             config.name(format!("et{}_{}_{}", self.dev_name, c, s));
             // set a temporary address
             config.address(format!("172.0.{}.3", c).parse::<IpAddr>().unwrap());
+
+            config.platform(|config| {
+                config.skip_config(true);
+                config.guid(None);
+                config.ring_cap(Some(config.min_ring_cap() * 2));
+            });
         }
 
         if self.queue_num != 1 {