X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ab22c228c885fd8eee863b1d47eecbf19f96bfb3..0181656313fbe514928263f4061d42d338a5bb7c:/print-ip-demux.c

diff --git a/print-ip-demux.c b/print-ip-demux.c
index 9d562d77..7df0f709 100644
--- a/print-ip-demux.c
+++ b/print-ip-demux.c
@@ -161,7 +161,13 @@ again:
 		break;
 
 	case IPPROTO_IGMP:
-		igmp_print(ndo, bp, length);
+		if (ver == 4)
+			igmp_print(ndo, bp, length);
+		else {
+			ND_PRINT("[%s requires IPv4]",
+				 tok2str(ipproto_values,"unknown",nh));
+			nd_print_invalid(ndo);
+		}
 		break;
 
 	case IPPROTO_IPV4: