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How to delete the one of iptables chains?

Dear all,
My nat Chain PREROUTING is following. How to delete the one of chains? Thanks for any ideas.

Chain PREROUTING (policy ACCEPT)
target prot opt source destination
DNAT udp -- anywhere anywhere udp dpt:telnet to:192.168.1.218:23
DNAT udp -- anywhere anywhere udp dpt:telnet to:192.168.1.218:23
DNAT tcp -- anywhere anywhere tcp dpt:telnet to:192.168.1.218:23
DNAT tcp -- anywhere anywhere tcp dpt:telnet to:192.168.1.218:23
DNAT tcp -- anywhere anywhere tcp dpt:telnet to:192.168.1.218:23
DNAT udp -- anywhere anywhere udp dpt:telnet to:192.168.1.218:23

Tommy

If you want to delete of of the rules under the chain PREROUTING, run:

Code:

iptables -D PREROUTING rulenum

where rulenum is the number of the rule you want to delete. For more details

Code:

man iptables