diff --git a/lua/zapret-auto.lua b/lua/zapret-auto.lua
index 68d6060..97a6dd2 100644
--- a/lua/zapret-auto.lua
+++ b/lua/zapret-auto.lua
@@ -161,7 +161,7 @@ function standard_failure_detector(desync, crec)
 						dis.tcp.th_win = desync.track and desync.track.pos.reverse.tcp.winsize or 64
 						dis.tcp.options = {}
 						if dis.ip6 then
-							dis.ip6.ip6_flow = desync.track.pos.reverse.ip6_flow
+							dis.ip6.ip6_flow = desync.track.pos.reverse.ip6_flow and desync.track.pos.reverse.ip6_flow or 0x60000000;
 						end
 						DLOG("standard_failure_detector: sending RST to retransmitter")
 						rawsend_dissect(dis, {ifout = desync.ifin})
diff --git a/nfq2/desync.c b/nfq2/desync.c
index 6ecd101..d2b0c6e 100644
--- a/nfq2/desync.c
+++ b/nfq2/desync.c
@@ -297,7 +297,7 @@ static bool auto_hostlist_retrans
 					*ip6 = *dis->ip6;
 					ip6->ip6_plen = htons(sizeof(struct tcphdr));
 					ip6->ip6_nxt = IPPROTO_TCP;
-					ip6->ip6_ctlun.ip6_un1.ip6_un1_flow = htonl(ctrack->pos.server.ip6flow);
+					ip6->ip6_ctlun.ip6_un1.ip6_un1_flow = htonl(ctrack->pos.server.ip6flow ? ctrack->pos.server.ip6flow : 0x60000000);
 					tcp = (struct tcphdr*)(ip6+1);
 					*tcp = *dis->tcp;
 				}
diff --git a/nfq2/lua.c b/nfq2/lua.c
index 619da0b..ea58d38 100644
--- a/nfq2/lua.c
+++ b/nfq2/lua.c
@@ -1276,10 +1276,11 @@ void lua_pushf_ctrack_pos(const t_ctrack *ctrack, const t_ctrack_position *pos)
 	lua_pushf_lint("pcounter", pos->pcounter);
 	lua_pushf_lint("pdcounter", pos->pdcounter);
 	lua_pushf_lint("pbcounter", pos->pbcounter);
+	if (pos->ip6flow) lua_pushf_int("ip6_flow", pos->ip6flow);
 	if (ctrack->ipproto == IPPROTO_TCP)
 	{
 		lua_pushliteral(params.L, "tcp");
-		lua_createtable(params.L, 0, 12);
+		lua_createtable(params.L, 0, 11);
 		lua_pushf_lint("seq0", pos->seq0);
 		lua_pushf_lint("seq", pos->seq_last);
 		lua_pushf_lint("rseq", pos->seq_last - pos->seq0);
@@ -1291,7 +1292,6 @@ void lua_pushf_ctrack_pos(const t_ctrack *ctrack, const t_ctrack_position *pos)
 		lua_pushf_int("winsize_calc", pos->winsize_calc);
 		lua_pushf_int("scale", pos->scale);
 		lua_pushf_int("mss", pos->mss);
-		lua_pushf_int("ip6_flow", pos->ip6flow);
 		lua_rawset(params.L,-3);
 	}
 
@@ -3005,6 +3005,8 @@ static void lua_init_const(void)
 		{"IPTOS_ECN_CE",IPTOS_ECN_CE},
 		{"IPTOS_DSCP_MASK",0xF0},
 		{"IP6F_MORE_FRAG",0x0001}, // in ip6.h it's defined depending of machine byte order
+		{"IPV6_FLOWLABEL_MASK",0x000FFFFF},
+		{"IPV6_FLOWINFO_MASK",0x0FFFFFFF},
 
 		{"IPPROTO_IP",IPPROTO_IP},
 		{"IPPROTO_IPV6",IPPROTO_IPV6},