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Linux IP Masquerade HOWTO
Chapter 7. Frequently Asked Questions
7.29. ( Multiple-LANs ) - I have two MASQed LANs but they cannot communicate with each other!
for full details.
( IP Aliasing ) - Can IP Masquerade work with only ONE Ethernet network card?
( SHAPING ) - I want to be able to limit the speed of specific types of traffic