diff --git a/src/bin/sdlan/main.rs b/src/bin/sdlan/main.rs
index 4acd821..15fd805 100644
--- a/src/bin/sdlan/main.rs
+++ b/src/bin/sdlan/main.rs
@@ -35,7 +35,7 @@ async fn main() {
             _allow_routing: true,
             _drop_multicast: true,
             register_ttl: 1,
-            mtu: 1290,
+            mtu: 1400,
             name: "tau".to_owned(),
             tos: 0,
             local_port: cmd.port,
diff --git a/src/network/async_main.rs b/src/network/async_main.rs
index 043a583..56e5927 100644
--- a/src/network/async_main.rs
+++ b/src/network/async_main.rs
@@ -555,7 +555,7 @@ async fn loop_tap(eee: &'static Node, cancel: CancellationToken) {
 async fn get_tun_flow(eee: &'static Node, tx: Sender<Vec<u8>>) {
     loop {
         let buf = tokio::task::spawn_blocking(|| {
-            let mut buf = vec![0; 1800];
+            let mut buf = vec![0; 1500];
             let Ok(size) = eee.device.recv(&mut buf) else {
                 return vec![];
             };