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-rw-r--r--sys/netinet/ip6.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/netinet/ip6.h b/sys/netinet/ip6.h
index 336ef48..bbc18df 100644
--- a/sys/netinet/ip6.h
+++ b/sys/netinet/ip6.h
@@ -213,6 +213,7 @@ struct ip6_frag {
#define IPV6_MMTU 1280 /* minimal MTU and reassembly. 1024 + 256 */
#define IPV6_MAXPACKET 65535 /* ip6 max packet size without Jumbo payload*/
+#define IPV6_MAXOPTHDR 2048 /* max option header size, 256 64-bit words */
#ifdef _KERNEL
/*
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