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Fix IPv6 UDP: send NDP probe before data to populate neighbor cache
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macOS returns ENOBUFS on IPv6 send_to() until NDP neighbor resolution
completes. Send a 1-byte probe packet and wait 200ms for NDP to resolve
before starting the data blast.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-03-31 19:06:41 +04:00
parent 4e3b2939ca
commit 50c0ba528d
1 changed files with 8 additions and 0 deletions
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8
src/server.rs
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@@ -666,6 +666,14 @@ async fn run_udp_test_server(
let client_udp_addr = SocketAddr::new(peer.ip(), client_udp_port); let client_udp_addr = SocketAddr::new(peer.ip(), client_udp_port);
// On IPv6, send a probe packet to trigger NDP neighbor resolution before blasting.
// macOS returns ENOBUFS on send_to() until the neighbor cache is populated.
if peer.is_ipv6() {
let _ = udp.send_to(&[0u8; 1], client_udp_addr).await;
tokio::time::sleep(Duration::from_millis(200)).await;
tracing::debug!("IPv6 NDP probe sent to {}", client_udp_addr);
}
// When connection_count > 1, MikroTik sends UDP from MULTIPLE source ports // When connection_count > 1, MikroTik sends UDP from MULTIPLE source ports
// (base_port, base_port+1, ..., base_port+N-1) all to our single server port. // (base_port, base_port+1, ..., base_port+N-1) all to our single server port.
// A connect()'d UDP socket only accepts from the one connected address, // A connect()'d UDP socket only accepts from the one connected address,