diff --git a/headers/posix/netinet/in.h b/headers/posix/netinet/in.h
index f2e2dc1db7..2bb0fc5201 100644
--- a/headers/posix/netinet/in.h
+++ b/headers/posix/netinet/in.h
@@ -164,6 +164,8 @@ struct group_source_req {
 #define IPV6_DSTOPTS				36  /* struct ip6_dest */
 #define IPV6_RTHDR					37  /* struct ip6_rthdr */
 
+#define IP_DONTFRAG					38  /* bool; don't fragment */
+
 
 #define INADDR_ANY					((in_addr_t)0x00000000)
 #define INADDR_LOOPBACK				((in_addr_t)0x7f000001)
diff --git a/src/add-ons/kernel/network/protocols/ipv4/ipv4.cpp b/src/add-ons/kernel/network/protocols/ipv4/ipv4.cpp
index 101b285a86..41a195ee1a 100644
--- a/src/add-ons/kernel/network/protocols/ipv4/ipv4.cpp
+++ b/src/add-ons/kernel/network/protocols/ipv4/ipv4.cpp
@@ -188,6 +188,7 @@ struct ipv4_protocol : net_protocol {
 // protocol flags
 #define IP_FLAG_HEADER_INCLUDED		0x01
 #define IP_FLAG_RECEIVE_DEST_ADDR	0x02
+#define IP_FLAG_DONT_FRAGMENT		0x04
 
 
 static const int kDefaultTTL = 254;
@@ -1203,6 +1204,10 @@ ipv4_getsockopt(net_protocol* _protocol, int level, int option, void* value,
 			return get_int_option(value, *_length,
 				(protocol->flags & IP_FLAG_RECEIVE_DEST_ADDR) != 0);
 		}
+		if (option == IP_DONTFRAG) {
+			return get_int_option(value, *_length,
+				(protocol->flags & IP_FLAG_DONT_FRAGMENT) != 0);
+		}
 		if (option == IP_TTL)
 			return get_int_option(value, *_length, protocol->time_to_live);
 		if (option == IP_TOS)
@@ -1302,6 +1307,21 @@ ipv4_setsockopt(net_protocol* _protocol, int level, int option,
 
 			return B_OK;
 		}
+		if (option == IP_DONTFRAG) {
+			int headerIncluded;
+			if (length != sizeof(int))
+				return B_BAD_VALUE;
+			if (user_memcpy(&headerIncluded, value, sizeof(headerIncluded))
+					!= B_OK)
+				return B_BAD_ADDRESS;
+
+			if (headerIncluded)
+				protocol->flags |= IP_FLAG_DONT_FRAGMENT;
+			else
+				protocol->flags &= ~IP_FLAG_DONT_FRAGMENT;
+
+			return B_OK;
+		}
 		if (option == IP_TTL)
 			return set_int_option(protocol->time_to_live, value, length);
 		if (option == IP_TOS)
@@ -1521,7 +1541,9 @@ ipv4_send_routed_data(net_protocol* _protocol, struct net_route* route,
 		header->total_length = htons(buffer->size);
 		header->id = htons(atomic_add(&sPacketID, 1));
 		header->fragment_offset = 0;
-		if (protocol) {
+		if (protocol != NULL) {
+			if ((protocol->flags & IP_FLAG_DONT_FRAGMENT) != 0)
+				header->fragment_offset |= htons(IP_DONT_FRAGMENT);
 			header->time_to_live = (buffer->msg_flags & MSG_MCAST) != 0
 				? protocol->multicast_time_to_live : protocol->time_to_live;
 		} else {
@@ -1602,6 +1624,9 @@ ipv4_send_routed_data(net_protocol* _protocol, struct net_route* route,
 
 	uint32 mtu = route->mtu ? route->mtu : interface->device->mtu;
 	if (buffer->size > mtu) {
+		if (protocol != NULL && (protocol->flags & IP_FLAG_DONT_FRAGMENT) != 0)
+			return EMSGSIZE;
+
 		// we need to fragment the packet
 		return send_fragments(protocol, route, buffer, mtu);
 	}