--- cci/sys/netinet/ip_output.c	2019/07/28 12:24:19	1.1
+++ cci/sys/netinet/ip_output.c	2019/07/28 12:29:35	1.1.1.2
@@ -155,9 +155,15 @@ gotif:
 		} else
 			mh->m_len = sizeof (struct ip);
 		mhip->ip_off = off >> 3;
-		if (off + len >= ip->ip_len-hlen)
+		if (off + len >= ip->ip_len-hlen) {
 			len = mhip->ip_len = ip->ip_len - hlen - off;
-		else {
+			/*
+			 * if the output packet has M flag set, make sure
+			 * this flag is set for the last fragment
+			 */
+			if (ip->ip_off & IP_MF) 
+				mhip->ip_off |= IP_MF;
+		} else {
 			mhip->ip_len = len;
 			mhip->ip_off |= IP_MF;
 		}