Linux IP Masquerade HOWTO
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7.22. ( MASQ Security ) - Can I configure IP MASQ to allow Internet users to directly contact internal MASQed servers?

Yes! With IPPORTFW, you can allow ALL or only a select few Internet hosts to contact ANY of your internal MASQed computers. This topic is completely covered in Section 6.7 in this HOWTO.

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( Log Reduction ) - My logs are filling up with packet hits due to the new "stronger" rulesets. How can I fix this?Up( Free Ports ) - I'm getting "kernel: ip_masq_new(proto=UDP): no free ports." in my SYSLOG files. Whats up?