I would like to thank you for your help and your support.
However, I am going to implement NAT solution inside my organization with 3 goals:-
1- Allow 2 Internal users ( CEO & VP ) to access Internet [using Static], using 2 Real IP assigned from MY ISP.
2-Allow 200 Internal Users to Access Internet [Using Dynamic as Overloading], using the 3rd Real IP assigned from My ISP.
3-Allow ∞ Internet users ( any one ) to access 3 Servers Only which are inside my Network, using the 4th Real IP assigned from My ISP.
This Symbol ∞ means ----? unlimited, or, any Source, any IP from any where in the internet World .
In 2nd attached, which is [network-2.pps ] you will know , how many real IP I have here in My Network , and it has 2 slights.
Before, implementing this Solution, which is NAT, I want to consult you in current Configurations of My Cisco Router which is I have here inside my organization, in order to advice me if I need to change something or Not .
The Router have 2 Interfaces, which is:-
1-interface Fast Ethernet 0/ 0
2-interface Fast Ethernet 0/1
3-The Interface F 0 / 1 is connected to Normal Unmanaged Switch from 3 Com , and it has the following IP ? 188.8.131.52 / 255.255.255.248 - in Port no 2 in 3COM Switch.
4-There is a Firewall connected to the Same Switch 3 Com , in Port 3 , and it have 184.108.40.206 / 255.255.255.248 / GW 213.255.237. 113 on NIC 1 .
5-The 2nd NIC on the Firewall, have this IP , 192.168.1.100 / 24 .
6-All the Users inside my Network are connected to the Firewall, as GW to have Internet Connection device .
If I am going to implement NAT with 3 goals , do you think the current network will get down, because the Interface F 0/ 0 & F 0 / 1 are changed and one is becoming the INSIDE & Other ONE IS Becoming OUTSIDE ?
If so, can I purchase any Modular that have 4 Ethernet Ports, and do the NAT on it, and leave the Default Interfaces , as its without any disturb for OLD USERS ?
That was my question, because I have reviewed the INFRASTRUCTURE and I have seen this, so I am afraid if I implement NAT, the FIREWALL it Self, will not worked and all the users, will not have the INTERNET Connectivity and no work will done.
So, I am thinking of Purchase, one modular which is HWIC-4 , and put it in Slot 1 in the 1841 Cisco Router, and do the NAT Configurations for the New users, and leave the others as they are connected to the Firewall and have internet connection .
So, please give me your opinion, because I am get confused completely regarding the NAT and the Current situation, which I have here .
Can the Interfaces which is F 0 / 0 & F 0 / 1 , work normally with existing Network after I configure both of them with IP NAT INSIDE & IP NAT OUTSIDE ?
Or, if I change and made the F 0 / 0 as IP NAT OUTSIDE & F 0 / 1 as IP NAT INSIDE , and put the Static NAT Command, the Firewall will stop and all the others users will be unable completely to access Internet ?
Do you think I am thinking in the correct direction or not ?
I request to Purchase 2 HWIC, each one will have 4 Ethernet Ports, so the Total will have 8 Ethernet Ports .
Generally, I am asking you, if I want to implement NAT , with the 3 goals which I mention above, do I need to change the design completely from which I have to new design which I said , using the 2 HWIC Card ?
Please advice me, in order to start working on it , and develop the NAT Solution .
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