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diff -up dhcp-4.2.5/common/packet.c.ffff dhcp-4.2.5/common/packet.c
--- dhcp-4.2.5/common/packet.c.ffff 2013-10-07 17:21:18.000000000 +0200
+++ dhcp-4.2.5/common/packet.c 2013-10-07 17:47:34.689600497 +0200
@@ -326,6 +326,7 @@ decode_udp_ip_header(struct interface_in
len = ulen - sizeof(udp);
usum = udp.uh_sum;
+ if (usum == 0xffff) usum = 0;
udp.uh_sum = 0;
/* XXX: We have to pass &udp, because we have to zero the checksum