--- /dev/null
+#!/usr/bin/env bash
+
+. ./test.common
+
+test_start "PTP port"
+
+# Block communication between 3 and 1
+base_delay="(+ 1e-4 (* -1 (equal 0.1 from 3) (equal 0.1 to 1)))"
+
+cat > tmp/peer.keys <<-EOF
+1 MD5 1234567890
+EOF
+
+clients=2
+peers=2
+max_sync_time=420
+
+server_conf="
+ptpport 319"
+client_conf="
+ptpport 319
+authselectmode ignore
+keyfile tmp/peer.keys"
+client_server_options="minpoll 6 maxpoll 6 port 319"
+client_peer_options="minpoll 6 maxpoll 6 port 319 key 1"
+
+run_test || test_fail
+check_chronyd_exit || test_fail
+check_source_selection || test_fail
+check_sync || test_fail
+
+check_file_messages " 2 1 .* 319 319 1 96 " 150 160 \
+ log.packets || test_fail
+check_file_messages " 1 2 .* 319 319 1 96 " 150 160 \
+ log.packets || test_fail
+check_file_messages " 2 3 .* 319 319 1 116 " 150 160 \
+ log.packets || test_fail
+check_file_messages " 3 2 .* 319 319 1 116 " 150 160 \
+ log.packets || test_fail
+
+test_pass