diff --git a/ggsn_tests/GGSN_Tests.ttcn b/ggsn_tests/GGSN_Tests.ttcn
index 053939b24..259e650ff 100644
--- a/ggsn_tests/GGSN_Tests.ttcn
+++ b/ggsn_tests/GGSN_Tests.ttcn
@@ -701,6 +701,25 @@ module GGSN_Tests {
 		f_wait_icmp6(ctx, (tr_ICMPv6_ERP,tr_ICMPv6_DU));
 	}
 
+/* new block */
+
+	/* create ICMPv6 router solicitation deriving link-id from PDP Context EUA */
+	function f_icmpv6_rs_for_pdp46(in PdpContext ctx) return octetstring {
+		var OCT16 interface_id := ctx.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address;
+		return f_gen_icmpv6_router_solicitation(interface_id);
+	}
+
+	/* generate and encode ICMPv6 neighbor solicitation for PDP Context */
+	function f_gen_icmpv6_neigh_solicit_for_pdp46(in PdpContext ctx) return octetstring {
+		var OCT16 interface_id := ctx.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address;
+		var OCT16 link_local := f_ipv6_link_local(interface_id);
+		var OCT16 daddr := f_ipv6_sol_node_mcast(link_local);
+
+		return f_gen_icmpv6_neigh_solicit(link_local, daddr, link_local);
+	}
+
+/* new block end */
+
 	/* Assert we don't receive a ICMPv4/6 echo reply (or unreachable) from GTP */
 	function f_wait_gtpu_fail(PdpContext ctx) runs on GT_CT {
 		T_default.start;
@@ -1135,6 +1154,36 @@ module GGSN_Tests {
 		f_pdp_ctx_del(ctx, '1'B);
 	}
 
+	/* Validate if different clients (pdp ctx) can reach one another through GGSN. */
+	testcase TC_pdp46_clients_interact() runs on GT_CT {
+		f_init();
+		var PdpContext ctxA := valueof(t_DefinePDP(f_rnd_imsi('26242'H), '1234'O, c_ApnInet46, valueof(t_EuaIPv4Dynv6Dyn)));
+		var PdpContext ctxB := valueof(t_DefinePDP(f_rnd_imsi('26242'H), '1234'O, c_ApnInet46, valueof(t_EuaIPv4Dynv6Dyn)));
+		f_pdp_ctx_act(ctxA);
+		f_send_gtpu(ctxA, f_icmpv6_rs_for_pdp46(ctxA));
+		f_wait_rtr_adv(ctxA);
+		f_send_gtpu(ctxA, f_gen_icmpv6_neigh_solicit_for_pdp46(ctxA));
+
+		f_pdp_ctx_act(ctxB);
+		f_send_gtpu(ctxB, f_icmpv6_rs_for_pdp46(ctxB));
+		f_wait_rtr_adv(ctxB);
+		f_send_gtpu(ctxB, f_gen_icmpv6_neigh_solicit_for_pdp46(ctxB));
+
+		var OCT16 addrA_ll := f_ipv6_link_local(ctxA.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address);
+		var OCT16 addrB_ll := f_ipv6_link_local(ctxB.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address);
+		var OCT16 addrA_glob := f_ipv6_global(ctxA.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address);
+		var OCT16 addrB_glob := f_ipv6_global(ctxB.eua.endUserAddress.endUserAddressIPv4andIPv6.ipv6_address);
+
+		/* Validate if clients can interact using ll addr. */
+		f_send_gtpu(ctxA, f_gen_icmpv6_echo(addrA_ll, addrB_ll));
+		f_wait_gtpu_fail(ctxB);
+
+		/* Validate if clients can interact using global addr. */
+		f_send_gtpu(ctxA, f_gen_icmpv6_echo(addrA_glob, addrB_glob));
+		f_wait_gtpu_fail(ctxB);
+
+		f_pdp_ctx_del(ctxA, '1'B);
+	}
 
 	control {
 		execute(TC_pdp4_act_deact());
@@ -1157,6 +1206,7 @@ module GGSN_Tests {
 		execute(TC_pdp46_act_deact_pcodns4());
 		execute(TC_pdp46_act_deact_pcodns6());
 		execute(TC_pdp46_act_deact_gtpu_access());
+		execute(TC_pdp46_clients_interact());
 
 		execute(TC_echo_req_resp());
 	}