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fix(check-ipv6): make the TCP cross-check a real TCP probe

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- test 2 sent a Globalping "ping" with a port, which is still ICMP (its
  rawOutput is literally `PING ... icmp_seq=... 100% packet loss`), so it only
  repeated the ICMP result and reported NOT VERIFIED on a provider that filters
  inbound ICMPv6 while routing the prefix fine
- use the "tcp" measurement type and teach the summarizer that a finished probe
  with timings is a 0-loss success

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
This commit is contained in:
bluebluesodaandCommandCodeBot committed 2026-09-27 14:47:16 +00:00
1 parent 765b5b1510
commit 426c248e6c
1 file changed
+18 -8
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check-ipv6-support.sh
+18 -8
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@@ -351,9 +351,16 @@ worst = 100.0
ok = 0
any_ok = 0
for r in res:
st = r.get("result", {}).get("stats", {})
loss = st.get("loss", 100.0)
if loss is None: loss = 100.0
result = r.get("result", {}) or {}
stats = result.get("stats") or {}
loss = stats.get("loss")
if loss is None:
# A TCP measurement reports a finished handshake with timings instead
# of packet loss: finished + timings = a 0-loss success.
if result.get("status") == "finished" and result.get("timings"):
loss = 0.0
else:
loss = 100.0
if loss < worst: worst = loss
if loss == 0: ok += 1
if loss < 100: any_ok += 1
@@ -411,19 +418,22 @@ PING_OK=$(echo "$PING_SUM" | sed -n 's/.* ok=\([0-9]*\).*/\1/p')
PING_ANY=$(echo "$PING_SUM" | sed -n 's/.* any=\([0-9]*\).*/\1/p')
log "ICMP ping result (best of 3): $PING_SUM"
# --- test 2: TCP ping (a real TCP handshake to a port we listen on) ---
# TCP is not subject to ICMPv6 filtering, so it cross-checks the ICMP result.
# --- test 2: real TCP probe (a TCP handshake to a port we listen on) ---
# This is a genuine TCP measurement (type "tcp"), NOT a ping with a port: the
# ping type stays ICMP even when a port is given, so it would report the same
# ICMP filtering as test 1 and prove nothing about TCP. A provider that drops
# inbound ICMPv6 but routes the prefix passes here and is correctly VERIFIED.
PORT=4444
TCP_SUM="probes=0 ok=0 any=0 worst=100"
if [[ "$NC_AVAILABLE" -eq 1 ]]; then
log "sending TCP ping (port $PORT) to $TEST_ADDR ..."
log "sending TCP probe (port $PORT) to $TEST_ADDR ..."
nc -6 -l "$TEST_ADDR" "$PORT" >/dev/null 2>&1 &
NCPID=$!
TCP_SUM=$(gp_run_test "tcp" "{\"type\":\"ping\",\"target\":\"$TEST_ADDR\",\"locations\":[{\"magic\":\"world\",\"limit\":4}],\"measurementOptions\":{\"packets\":3,\"port\":$PORT}}")
TCP_SUM=$(gp_run_test "tcp" "{\"type\":\"tcp\",\"target\":\"$TEST_ADDR\",\"port\":$PORT,\"locations\":[{\"magic\":\"world\",\"limit\":4}]}")
kill "$NCPID" 2>/dev/null; NCPID=""
TCP_OK=$(echo "$TCP_SUM" | sed -n 's/.* ok=\([0-9]*\).*/\1/p')
TCP_ANY=$(echo "$TCP_SUM" | sed -n 's/.* any=\([0-9]*\).*/\1/p')
log "TCP ping result (best of 3): $TCP_SUM"
log "TCP probe result (best of 3): $TCP_SUM"
else
TCP_OK=0
TCP_ANY=0