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Please I need some help
for my final test at the University i purpose to create a linux server, with many services as DHCP, PROXY, SSH and others, then I've been trying da make a small network with 5 systems, 4 linux and 1 windows, but i need to share internet connection through them and I don't get.
I set up 1 linux with a NAT interface and 2 internal network, called "RedeInterna1" and "RedeInterna2", then i set up iptable sharing connection. The system get ping with which other but I don't get internet connection.
If someone can helpe me.
I"m sorry for my bad english, because I'm brazilian and I don't speak english very well
thank you

Internal network can't access internet from the Host, see the Manual what internal network and bridge means.

I'm not using internal network to access internet, there is a VM that access internet using NAT system, the others VMs I'm trying to access internet trough that first VM, using NAT.
The VM, that access internet, is like a server, sharing connection with others, those VMs are using a internal network to access this server.

NAT only connects between Host and its Guest and the internet the Host has, other Guests can not connect to Guests via NAT, you need a combination of internal networking and NAT using 2 lan Guest connections on the sharing VM.