diff --git a/src/native/libs/System.Native/pal_interfaceaddresses.c b/src/native/libs/System.Native/pal_interfaceaddresses.c
index e81e2110860b95..b05119512216b5 100644
--- a/src/native/libs/System.Native/pal_interfaceaddresses.c
+++ b/src/native/libs/System.Native/pal_interfaceaddresses.c
@@ -46,6 +46,13 @@
 #include "ios/net/if_media.h"
 #endif
 
+// SunOS defines both AF_LINK and AF_PACKET but AF_LINK is preferred.
+// Using AF_PACKET on SunOS requires access to system-private headers.
+// Use undef to keep all the changes here.
+#if defined(TARGET_SUNOS)
+#undef AF_PACKET
+#endif
+
 #if defined(AF_PACKET)
 #include <sys/ioctl.h>
 #if HAVE_NETPACKET_PACKET_H
diff --git a/src/native/libs/System.Native/pal_maphardwaretype.c b/src/native/libs/System.Native/pal_maphardwaretype.c
index 2a9e78216074ae..fd7520da21bfe8 100644
--- a/src/native/libs/System.Native/pal_maphardwaretype.c
+++ b/src/native/libs/System.Native/pal_maphardwaretype.c
@@ -7,6 +7,13 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 
+// SunOS defines both AF_LINK and AF_PACKET but AF_LINK is preferred.
+// Using AF_PACKET on SunOS requires access to system-private headers.
+// Use undef to keep all the changes here.
+#if defined(TARGET_SUNOS)
+#undef AF_PACKET
+#endif
+
 #if defined(AF_PACKET)
 #if HAVE_NETPACKET_PACKET_H
 #include <netpacket/packet.h>
diff --git a/src/native/libs/System.Native/pal_networking.c b/src/native/libs/System.Native/pal_networking.c
index 3b460d4c4e8296..07ed77b7cf7b81 100644
--- a/src/native/libs/System.Native/pal_networking.c
+++ b/src/native/libs/System.Native/pal_networking.c
@@ -204,6 +204,11 @@ static bool TryConvertAddressFamilyPlatformToPal(sa_family_t platformAddressFami
             *palAddressFamily = AddressFamily_AF_PACKET;
             return true;
 #endif
+#ifdef AF_LINK
+        case AF_LINK:
+            *palAddressFamily = AddressFamily_AF_LINK;
+            return true;
+#endif
 #ifdef AF_CAN
         case AF_CAN:
             *palAddressFamily = AddressFamily_AF_CAN;
@@ -241,6 +246,11 @@ static bool TryConvertAddressFamilyPalToPlatform(int32_t palAddressFamily, sa_fa
             *platformAddressFamily = AF_PACKET;
             return true;
 #endif
+#ifdef AF_LINK
+        case AddressFamily_AF_LINK:
+            *platformAddressFamily = AF_LINK;
+            return true;
+#endif
 #ifdef AF_CAN
         case AddressFamily_AF_CAN:
             *platformAddressFamily = AF_CAN;
@@ -2546,6 +2556,11 @@ static bool TryConvertProtocolTypePalToPlatform(int32_t palAddressFamily, int32_
             *platformProtocolType = palProtocolType;
             return true;
 #endif
+#ifdef AF_LINK
+        case AddressFamily_AF_LINK:
+            *platformProtocolType = palProtocolType;
+            return true;
+#endif
 #if HAVE_LINUX_CAN_H
         case AddressFamily_AF_CAN:
             switch (palProtocolType)
@@ -2685,6 +2700,11 @@ static bool TryConvertProtocolTypePlatformToPal(int32_t palAddressFamily, int pl
             *palProtocolType = platformProtocolType;
             return true;
 #endif
+#ifdef AF_LINK
+        case AddressFamily_AF_LINK:
+            *palProtocolType = platformProtocolType;
+            return true;
+#endif
 #if HAVE_LINUX_CAN_H
         case AddressFamily_AF_CAN:
             switch (platformProtocolType)
diff --git a/src/native/libs/System.Native/pal_networking.h b/src/native/libs/System.Native/pal_networking.h
index c393a3dbad4619..2a42329fc02fe1 100644
--- a/src/native/libs/System.Native/pal_networking.h
+++ b/src/native/libs/System.Native/pal_networking.h
@@ -66,6 +66,7 @@ typedef enum
     AddressFamily_AF_UNIX = 1,     // System.Net.AddressFamily.Unix
     AddressFamily_AF_INET = 2,     // System.Net.AddressFamily.InterNetwork
     AddressFamily_AF_INET6 = 23,   // System.Net.AddressFamily.InterNetworkV6
+    AddressFamily_AF_LINK = 13,       // System.Net.AddressFamily.DataLink
     AddressFamily_AF_PACKET = 65536,  // System.Net.AddressFamily.Packet
     AddressFamily_AF_CAN = 65537,     // System.Net.AddressFamily.ControllerAreaNetwork
 } AddressFamily;