X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ebe4b9f1be73a0af34508009d3b1d0139e6adfda..a271c5ecb9c9ea1cbecff1569eb647cfb16dc187:/print-tcp.c

diff --git a/print-tcp.c b/print-tcp.c
index 84442eb2..38f80d9b 100644
--- a/print-tcp.c
+++ b/print-tcp.c
@@ -425,9 +425,11 @@ tcp_print(netdissect_options *ndo,
                 }
         }
 
-        if (flags & TH_ACK) {
+        if (flags & TH_ACK)
                 ND_PRINT(", ack %u", ack);
-        }
+        else
+                if (ndo->ndo_vflag > 1 && ack != 0)
+                        ND_PRINT(", [ack %u != 0 while ACK flag not set]", ack);
 
         ND_PRINT(", win %u", win);