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diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c
--- a/sys/netinet/ip_output.c
+++ b/sys/netinet/ip_output.c
@@ -1066,8 +1066,8 @@
if (csum == 0)
csum = 0xffff;
} else {
- cklen = ntohs(ip->ip_len);
- csum = in_cksum_skip(m, cklen, offset);
+ cklen = ntohs(ip->ip_len) - (ip->ip_hl << 2);
+ csum = in_cksum_skip(m, cklen + offset, offset);
}
offset += m->m_pkthdr.csum_data; /* checksum offset */

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