Index: sbin/dhclient/packet.c
===================================================================
--- sbin/dhclient/packet.c
+++ sbin/dhclient/packet.c
@@ -198,8 +198,8 @@
 
 	/*
 	 * Compute UDP checksums, including the ``pseudo-header'', the
-	 * UDP header and the data.   If the UDP checksum field is zero,
-	 * we're not supposed to do a checksum.
+	 * UDP header and the data.   If the UDP checksum field is zero
+	 * or 0xffff (offloaded) we're not supposed to do a checksum.
 	 */
 	if (!data) {
 		data = buf + bufix + ip_len + sizeof(*udp);
@@ -231,7 +231,7 @@
 	    IPPROTO_UDP + (u_int32_t)ntohs(udp->uh_ulen)))));
 
 	udp_packets_seen++;
-	if (usum && usum != sum) {
+	if (usum && (u_short)usum != 0xffff && usum != sum) {
 		udp_packets_bad_checksum++;
 		if (udp_packets_seen > 4 &&
 		    (udp_packets_seen / udp_packets_bad_checksum) < 2) {