Why would these rules cause errors only sometimes?

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Hiii,

Can someone tell me why these rules will only casue errors "sometimes"? I ran my
script before and it worked fine. But then i added a few more log polocies
and drop rules and then i get errors. I know its these rules casue when i #
commented them out the script it ran properly again and it happened before but
it fixed itself somehow. Here are the rules that are casue the error:

iptables -A OUPUT -o eth0 -p tcp \
         -s eth0 --sport 1024:65535 \
         --dport 80 -j ACCEPT
iptables -A INPUT -i eth0 -p tcp \
         --sport 80 \
         -d eth0 --dport 1024:65535 -j ACCEPT


iptables -A INPUT -i eth0 -p udp \
         -s 122.xx.xxx.xx  --sport 67 \
         --dport 68 -j ACCEPT
iptables -A OUTPUT -o eth0 -p udp \
         -s eth0 --sport 68 \
         -d 122.xx.xxx.xx --dport 67 -j ACCEPT


Here the error i get:
iptables v1.2.7a: host/network  `eth0' not found
Try iptables `iptables -h' or `iptables --help for more infomation'
iptables v1.2.7a: host/network  `eth0' not found
Try iptables `iptables -h' or `iptables --help for more infomation'
iptables v1.2.7a: host/network  `eth0' not found
Try iptables `iptables -h' or `iptables --help for more infomation'

Here are the rules i added and they work fine when i comment out the above
rules!
iptables -t nat --policy PREROUTING -j DROP
iptables -t nat --policy OUPUT -j DROP
iptables -t nat --policy POSTROUTING -j DROP


how can i fix this? thanks guys! i have a dynamic ip address and i cant get pump
to work thats why i using eth0 instaead of an IP adress! 


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