diff --git a/src/arp.c b/src/arp.c
index 4896472..78df82b 100644
--- a/src/arp.c
+++ b/src/arp.c
@@ -196,6 +196,11 @@ static int arp_input(const struct ether_hdr *hdr __unused,
             LOG(LOG_WARN, "Invalid ARP op: %d", arp.arp_oper);
             break;
         }
+    } else if (arp.arp_ptype == ETHER_PROTO_IPV6) {
+        /* TODO: IPv6 support */
+        LOG(LOG_INFO, "TODO: IPv6 support - WIP");
+
+        return -EPROTOTYPE;
     } else {
         LOG(LOG_DEBUG, "Unknown ptype");
 
diff --git a/src/nstack_ip.h b/src/nstack_ip.h
index 0eee609..e70e822 100644
--- a/src/nstack_ip.h
+++ b/src/nstack_ip.h
@@ -42,6 +42,20 @@ struct ip_hdr {
 
 } __attribute__((packed, aligned(4)));
 
+/**
+ * IPv6 Packet Header.
+ */
+struct ipv6_hdr {
+    uint8_t     ip_vhl;         /* version */
+    uint16_t    ip_tc;          /* traffic class */
+    uint32_t    ip_flb;         /* flowlabel (20 bits) */
+    uint32_t    ip_len;         /* payload length */
+    uint16_t    ip_nhdr;        /* next header */
+    uint16_t    ip_hopl;        /* hoplimit */
+    uint8_t     ip_src[16];     /* source address */
+    uint8_t     ip_dst[16];     /* destination address */
+} __attribute__((packed, aligned(4)));
+
 /**
  * IP Packet Header Defaults
  * @{