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iptables -t mangle -I FORWARD -p udp --dport 53 -m connmark --mark 0x1 -j NFQUEUE --queue-num 1 --queue-bypass;
iptables -t mangle -I FORWARD -p udp --sport 53 -m connmark --mark 0x1 -j NFQUEUE --queue-num 1 --queue-bypass;
iptables -t mangle -I INPUT -p udp --dport 53 -m connmark --mark 0x1 -j NFQUEUE --queue-num 1 --queue-bypass;
iptables -t mangle -I OUTPUT -p udp --dport 53 -m connmark --mark 0x1 -j NFQUEUE --queue-num 1 --queue-bypass;
 
Equivalent Netfilter rules:
ovsh i Netfilter name:="dev_dpi.nfqueue_dns_out" priority:=0 protocol:="ipv4" rule:="-p udp --dport 53 -m connmark --mark 0x1 --queue-num 1 --queue-bypass" status:="enabled" table:="mangle" target:="NFQUEUE" chain:="DPI_NFQUEUE" enable:="true";
ovsh i Netfilter name:="dev_dpi.nfqueue_dns_in" priority:=0 protocol:="ipv4" rule:="-p udp --sport 53 -m connmark --mark 0x1 --queue-num 1 --queue-bypass" status:="enabled" table:="mangle" target:="NFQUEUE" chain:="DPI_NFQUEUE" enable:="true";