On my openvz host node, I have blocked port 25 using the following command ..

iptables -A FORWARD -j DROP -p tcp --destination-port 25

This is fine, but it blocks the port for all the containers.

Therefore, I have tried something like this, although it is listed in iptables -L, the connection cant be made. (Tried to check via telnet)

iptables -I FORWARD --source 7.5.4.7 --protocol tcp --destination-port 25

OR

iptables -I FORWARD --source 7.5.4.7 --protocol tcp --destination-port 25 -j ACCEPT

Any idea what is wrong?

PS. The block command is in the end, and nothing is below it. So this shouldn't be a problem. And if there is a way to block instead of allow, that will be fine too.

Thanks
papa2ae

If you are using bridged networking iptables don't act as you expect. Try searching "ebtables bridged networking"

But if the top command works fine, why doesn't the second one work the way it is meant to?

It has always worked for me ...

And no, not using a bridged network setup