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Is there anything wrong with these rules? They cannot be added to iptables, no error but they just don't show up in iptables -vnL

iptables  -I FORWARD 1 -s -p udp -m connlimit --connlimit-above 20 --connlimit-mask 24 -j DROP

iptables -I FORWARD 1 -s -p udp -m connlimit --connlimit-above 10 -j DROP

iptables -I FORWARD 1 -s -p udp -m connlimit --connlimit-above 10 --connlimit-mask 24 -j DROP
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Try the following command:

iptables -vnL FORWARD
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