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Fix IPv6 UDP TX: enlarge socket buffers to 4MB
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macOS IPv6 UDP sockets have tiny default send buffers, causing
immediate ENOBUFS on every send_to(). Set SO_SNDBUF and SO_RCVBUF
to 4MB using socket2, matching what works for high-throughput IPv4.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-03-31 19:01:50 +04:00
parent a1dbc6dc5a
commit 6ba57864a0
1 changed files with 8 additions and 0 deletions
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8
src/server.rs
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@@ -644,6 +644,14 @@ async fn run_udp_test_server(
format!("0.0.0.0:{}", server_udp_port).parse().unwrap() format!("0.0.0.0:{}", server_udp_port).parse().unwrap()
}; };
let udp = UdpSocket::bind(bind_addr).await?; let udp = UdpSocket::bind(bind_addr).await?;
// Enlarge send/receive buffers — IPv6 on macOS has small defaults
let std_sock = udp.into_std()?;
let sock2 = socket2::Socket::from(std_sock);
let _ = sock2.set_send_buffer_size(4 * 1024 * 1024); // 4MB
let _ = sock2.set_recv_buffer_size(4 * 1024 * 1024);
let udp = UdpSocket::from_std(sock2.into())?;
let client_udp_addr = SocketAddr::new(peer.ip(), client_udp_port); let client_udp_addr = SocketAddr::new(peer.ip(), client_udp_port);
// When connection_count > 1, MikroTik sends UDP from MULTIPLE source ports // When connection_count > 1, MikroTik sends UDP from MULTIPLE source ports