docs

README.md

@@ -11,3 +11,4 @@ Railgun Tun
 - `UP_SCRIPT` `DOWN_SCRIPT` Optional. Script to run when tun is up and down.
 - `ENDPOINT` Optional. Initial endpoint to connect to.
 - `MARK` Optional. Mark to set on packets.
+- `FAMILY` IPv6 if set to 6, otherwise 4.

src/main.cpp

@@ -156,7 +156,7 @@ int main(int argc, char *argv[]) {
     auto up = get_var("UP_SCRIPT");
     auto endpoint = get_var("ENDPOINT");
     auto mark = get_var_number("MARK");
-    auto family = get_var_number("FAMILY", true) == 4 ? AF_INET : AF_INET6;
+    auto family = get_var_number("FAMILY") == 6 ? AF_INET6 : AF_INET;
 
     if (endpoint != nullptr) {
         addrinfo hints = {