iptables rule no actions on scapy packets

I wrote this rule to change all udp destination IP addresses to 8.8.8.8 when dport is 53: iptables -t nat -A OUTPUT -p udp -m udp --dport 53 -j DNAT --to-destination 8.8.8.8 The rule worked when I used: dig +short iranled.com @4.2.2.4 tcpdump output is: 04:42:38.023348 IP 192.168.1.2.48984 > 8.8.8.8.53: UDP, length 29 04:42:38.242241 IP 8.8.8.8.53 > 192.168.1.2.48984: UDP, length 45 it is OK. But when I create this packet from scapy, the iptables rule has no result! sr1(IP(dst="4.2.2.4")/UDP()/DNS(rd=1,qd=DNSQR(qname="iranled.com"))) tcpdump output is: 04:43:00.442453 IP 192.168.1.2.53 > 4.2.2.4.53: UDP, length 29 04:43:00.855930 IP 4.2.2.4.53 > 192.168.1.2.53: UDP, length 45 why aren't scapy packets changed by iptables? **UPDATE**: #iptables -L -n --line-numbers Chain INPUT (policy DROP) num target prot opt source destination 1 ACCEPT tcp -- 127.0.0.1 0.0.0.0/0 tcpflags:! 0x17/0x02 2 ACCEPT udp -- 127.0.0.1 0.0.0.0/0 3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 4 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 10/sec burst 5 5 DROP all -- 0.0.0.0/0 255.255.255.255 6 DROP all -- 0.0.0.0/0 192.168.1.255 7 DROP all -- 224.0.0.0/8 0.0.0.0/0 8 DROP all -- 0.0.0.0/0 224.0.0.0/8 9 DROP all -- 255.255.255.255 0.0.0.0/0 10 DROP all -- 0.0.0.0/0 0.0.0.0 11 DROP all -- 0.0.0.0/0 0.0.0.0/0 state INVALID 12 LSI all -f 0.0.0.0/0 0.0.0.0/0 limit: avg 10/min burst 5 13 INBOUND all -- 0.0.0.0/0 0.0.0.0/0 14 LOG_FILTER all -- 0.0.0.0/0 0.0.0.0/0 15 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix "Unknown Input" Chain FORWARD (policy DROP) num target prot opt source destination 1 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 10/sec burst 5 2 LOG_FILTER all -- 0.0.0.0/0 0.0.0.0/0 3 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix "Unknown Forward" Chain OUTPUT (policy DROP) num target prot opt source destination 1 ACCEPT tcp -- 192.168.1.2 127.0.0.1 tcp dpt:53 2 ACCEPT udp -- 192.168.1.2 127.0.0.1 udp dpt:53 3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 4 DROP all -- 224.0.0.0/8 0.0.0.0/0 5 DROP all -- 0.0.0.0/0 224.0.0.0/8 6 DROP all -- 255.255.255.255 0.0.0.0/0 7 DROP all -- 0.0.0.0/0 0.0.0.0 8 DROP all -- 0.0.0.0/0 0.0.0.0/0 state INVALID 9 OUTBOUND all -- 0.0.0.0/0 0.0.0.0/0 10 LOG_FILTER all -- 0.0.0.0/0 0.0.0.0/0 11 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 6 prefix "Unknown Output" Chain INBOUND (1 references) num target prot opt source destination 1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 2 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 3 LSI all -- 0.0.0.0/0 0.0.0.0/0 Chain LOG_FILTER (5 references) num target prot opt source destination Chain LSI (2 references) num target prot opt source destination 1 LOG_FILTER all -- 0.0.0.0/0 0.0.0.0/0 2 LOG tcp -- 0.0.0.0/0 0.0.0.0/0 tcpflags: 0x17/0x02 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix "Inbound " 3 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcpflags: 0x17/0x02 4 LOG tcp -- 0.0.0.0/0 0.0.0.0/0 tcpflags: 0x17/0x04 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix "Inbound " 5 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcpflags: 0x17/0x04 6 LOG icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 8 limit: avg 1/sec burst 5 LOG flags 0 level 6 prefix "Inbound " 7 DROP icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 8 8 LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 5/sec burst 5 LOG flags 0 level 6 prefix "Inbound " 9 DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain LSO (0 references) num target prot opt source destination 1 LOG_FILTER all -- 0.0.0.0/0 0.0.0.0/0 2 LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 5/sec burst 5 LOG flags 0 level 6 prefix "Outbound " 3 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable Chain OUTBOUND (1 references) num target prot opt source destination 1 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 3 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0