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--- sys/netinet/tcp_syncache.c.orig
+++ sys/netinet/tcp_syncache.c
@@ -1728,7 +1728,8 @@
ip6->ip6_dst = sc->sc_inc.inc6_faddr;
ip6->ip6_plen = htons(tlen - hlen);
/* ip6_hlim is set after checksum */
- ip6->ip6_flow &= ~IPV6_FLOWLABEL_MASK;
+ /* Zero out traffic class and flow label. */
+ ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK;
ip6->ip6_flow |= sc->sc_flowlabel;
th = (struct tcphdr *)(ip6 + 1);
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