run the following command:-
# iptables -t nat -A PREROUTING -d 212.241.215.114 -p tcp --dport 26 -j REDIRECT --to-ports 25 -v
REDIRECT tcp opt -- in * out * 0.0.0.0/0 -> 212.241.215.114 tcp dpt:26 redir ports 25
iptables: No chain/target/match by that name
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# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT icmp -- anywhere anywhere
VZ_INPUT all -- anywhere anywhere
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT icmp -- anywhere anywhere
VZ_FORWARD all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT icmp -- anywhere anywhere
VZ_OUTPUT all -- anywhere anywhere
Chain VZ_FORWARD (1 references)
target prot opt source destination
Chain VZ_INPUT (1 references)
target prot opt source destination
Chain VZ_OUTPUT (1 references)
target prot opt source destination
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# iptables -L -n -t nat
Chain PREROUTING (policy ACCEPT)
target prot opt source destination
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination