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Fix IPv6 UDP: use unconnected socket for IPv6 peers
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macOS connected IPv6 UDP sockets don't receive properly.
Use unconnected socket (send_to/recv_from) for IPv6 peers,
same as multi-connection mode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-03-31 18:37:43 +04:00
parent 0385d2e745
commit 176cdae239
1 changed files with 7 additions and 4 deletions
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11
src/server.rs
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@@ -652,15 +652,18 @@ async fn run_udp_test_server(
// silently dropping packets from the other ports.
// So: only connect() for single-connection mode (enables send() without addr).
// For multi-connection, we leave the socket unconnected and use send_to()/recv_from().
let multi_conn = cmd.tcp_conn_count > 0;
if !multi_conn {
// Don't connect() UDP socket when:
// - Multi-connection mode (MikroTik sends from multiple source ports)
// - IPv6 (macOS connected IPv6 UDP sockets have receive issues)
let use_unconnected = cmd.tcp_conn_count > 0 || peer.is_ipv6();
if !use_unconnected {
udp.connect(client_udp_addr).await?;
}
tracing::info!(
"UDP mode: conn_count={}, socket={}",
cmd.tcp_conn_count.max(1),
if multi_conn { "unconnected (multi-port RX)" } else { "connected" },
if use_unconnected { "unconnected" } else { "connected" },
);
let state = BandwidthState::new();
@@ -674,7 +677,7 @@ async fn run_udp_test_server(
let state_tx = state.clone();
let udp_tx = udp.clone();
let tx_target = client_udp_addr;
let is_multi = multi_conn;
let is_multi = use_unconnected;
let tx_handle = if server_should_tx {
Some(tokio::spawn(async move {
udp_tx_loop(&udp_tx, tx_size, tx_speed, state_tx, is_multi, tx_target).await