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This rule says: If this is a TCP packet, with source address 192.168.4.6, and destination port 9111, change the source address to 202.152.251.6.
Quote:
-A POSTROUTING -s 192.168.5.0/255.255.255.0 -j MASQUERADE
This rule says: If this packet has a source address within the 192.168.5.0/255.255.255.0 netblock, change the source address to whatever the primary IP of the outbound interface is.
I don't believe your first rule is necessary, and it looks to be detrimental considering you didn't specify an interface. Then again I may be missing something.
You probably are, since the OP gave two rules and no context. It seems to be an odd thing to want to do, but I'm not sure that you can say much more than that if you do not know anything about the network set-up and nothing about the rest of the iptables ruleset.
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