diff --git a/include/net/if_arp.h b/include/net/if_arp.h
index 2ffc3055..16b07403 100644
--- a/include/net/if_arp.h
+++ b/include/net/if_arp.h
@@ -40,6 +40,7 @@
 #define ARPHRD_CSLIP6   129
 #define ARPHRD_PPP      130
 #define ARPHRD_LOOPBACK 131
+#define ARPHRD_SIT      132 /* sit0 device - IPv6-in-IPv4.  */
 
 struct arphdr {
 	unsigned short int ar_hrd;		/* Format of hardware address.  */
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
new file mode 100644
index 00000000..4b5a6749
--- /dev/null
+++ b/include/net/ip6_route.h
@@ -0,0 +1,40 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * net/ip6_route.h
+ *
+ * Copyright 2024 Phoenix Systems
+ * Author: Mateusz Kobak
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+
+#ifndef _LIBPHOENIX_NET_IP6_ROUTE_H
+#define _LIBPHOENIX_NET_IP6_ROUTE_H
+
+#include <netinet/in.h>
+
+/*
+ * This is needed to compile route.c in busybox.
+ * Routes for IPv6 are not implemented yet
+ */
+struct in6_rtmsg {
+	struct in6_addr rtmsg_dst;
+	struct in6_addr rtmsg_src;
+	struct in6_addr rtmsg_gateway;
+	uint32_t rtmsg_type;
+	uint16_t rtmsg_dst_len;
+	uint16_t rtmsg_src_len;
+	uint32_t rtmsg_metric;
+	unsigned long int rtmsg_info;
+	uint32_t rtmsg_flags;
+	int rtmsg_ifindex;
+};
+
+
+#endif /* _LIBPHOENIX_NET_IP6_ROUTE_H */
diff --git a/include/net/route.h b/include/net/route.h
index 465a01f4..0473ecb2 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -13,6 +13,9 @@
 #define RTF_WINDOW      0x0080
 #define RTF_IRTT        0x0100
 #define RTF_REJECT      0x0200
+#define RTF_DEFAULT     0x0400
+#define RTF_ADDRCONF    0x0800
+#define RTF_CACHE       0x1000
 #define RTF_NONEXTHOP   0x00200000
 
 
diff --git a/include/netinet/icmp6.h b/include/netinet/icmp6.h
new file mode 100644
index 00000000..2964c09e
--- /dev/null
+++ b/include/netinet/icmp6.h
@@ -0,0 +1,53 @@
+/*
+ * Phoenix-RTOS
+ *
+ * libphoenix
+ *
+ * netinet/icmp6.h
+ *
+ * Copyright 2024 Phoenix Systems
+ * Author: Mateusz Kobak
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#ifndef _NETINET_ICMP6_H
+#define _NETINET_ICMP6_H
+
+#include <stdint.h>
+
+
+struct icmp6_hdr {
+	uint8_t icmp6_type;   /* type field */
+	uint8_t icmp6_code;   /* code field */
+	uint16_t icmp6_cksum; /* checksum field */
+	union {
+		uint32_t icmp6_un_data32[1]; /* type-specific field */
+		uint16_t icmp6_un_data16[2]; /* type-specific field */
+		uint8_t icmp6_un_data8[4];   /* type-specific field */
+	} icmp6_dataun;
+};
+
+#define icmp6_data32   icmp6_dataun.icmp6_un_data32
+#define icmp6_data16   icmp6_dataun.icmp6_un_data16
+#define icmp6_data8    icmp6_dataun.icmp6_un_data8
+#define icmp6_pptr     icmp6_data32[0] /* parameter prob */
+#define icmp6_mtu      icmp6_data32[0] /* packet too big */
+#define icmp6_id       icmp6_data16[0] /* echo request/reply */
+#define icmp6_seq      icmp6_data16[1] /* echo request/reply */
+#define icmp6_maxdelay icmp6_data16[0] /* mcast group membership */
+
+#define ICMP6_DST_UNREACH    1
+#define ICMP6_PACKET_TOO_BIG 2
+#define ICMP6_TIME_EXCEEDED  3
+#define ICMP6_PARAM_PROB     4
+
+#define ICMP6_ECHO_REQUEST     128
+#define ICMP6_ECHO_REPLY       129
+#define MLD_LISTENER_QUERY     130
+#define MLD_LISTENER_REPORT    131
+#define MLD_LISTENER_REDUCTION 132
+
+#endif /* _NETINET_ICMP6_H */
diff --git a/include/netinet/in.h b/include/netinet/in.h
index d86079d9..468d23b8 100644
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@@ -63,6 +63,7 @@ enum {
 	IPPROTO_GRE = 47,
 	IPPROTO_ESP = 50,
 	IPPROTO_AH = 51,
+	IPPROTO_ICMPV6 = 58,
 	IPPROTO_SCTP = 132,
 	IPPROTO_UDPLITE = 136,
 	IPPROTO_RAW = 255,
@@ -94,6 +95,9 @@ extern const struct in6_addr in6addr_loopback;
 #define IPV6_UNICAST_HOPS		0x00000020 /* Unicast hop limit */
 #define IPV6_V6ONLY				0x00000040 /* Restrict AF_INET6 socket to IPv6 communications only */
 
+#define IPV6_CHECKSUM 7
+#define IPV6_HOPLIMIT 52 /* not implemented  */
+
 /* IPv6 multicast address scopes */
 #define IPv6_ADDR_MC_SCOPE_NODELOCAL	0x1 /* Interface-Local scope */
 #define IPv6_ADDR_MC_SCOPE_LINKLOCAL	0x2 /* Link-Local scope */
diff --git a/include/sys/sockdefs.h b/include/sys/sockdefs.h
index 4dca1d4e..291ab0ee 100644
--- a/include/sys/sockdefs.h
+++ b/include/sys/sockdefs.h
@@ -19,4 +19,7 @@
 #define SOCK_NONBLOCK 0x8000
 #define SOCK_CLOEXEC  0x4000
 
+#define SOL_IPV6 41  /* IPPROTO_IPV6 */
+#define SOL_RAW  255 /* IPPROTO_RAW */
+
 #endif