I have been working for the past 3 days to no avail. I have goggled and searched for all matter of solutions but still no success.
My task is to find a way to map an address to another. But, the network it is going in to does not have a default gateway. (Vlan1) (I cannot configure the default gateway on these devices.)
The scenario is that this device is about to be used for VPN site to site access. When the other site is connected it will connect using the ip address we map to it (10.1.1.21). For now its only one server that needs to access. But, in the future it might be two or more.
An idea of how a ping to 10.1.1.21 would work after finished.
Source: -RangeOfIPs- (Lets say 126.96.36.199)
=> ROUTER NAT =>
Source: 192.168.0.21 Destination: 192.168.0.114 (Internal Server)
On the return the following would happen:
Source: 192.168.0.114 (Internal Server)
=> ROUTER NAT =>
Destination: -RangeOfIPs- (188.8.131.52)
The Router in use is currently a Cisco 881 and has one WAN port and 4 Switch Ports
The WAN port is connected to the other networks and one of the switch ports is connected to our local network switch.
The roll of Loopback 0 is to create a network that the other side of the VPN site to site will use. They connect to the router via VPN which is to its public IP (184.108.40.206), then, they would connect to the server via 10.1.1.21 to access that resource. That way, we dont need default routes and at the same time control which server they have access too via VPN.
I plan on making the VPN after this is complete and ready, and i am going to use ACLs to prevent the VPN from accessing the 192 network. At least, to my knowledge should be possible.
Here is the configuration that i have to start with.
! interface Loopback0 ip address 10.1.1.1 255.255.255.0 ! interface FastEthernet4 ip address 220.127.116.11 255.255.255.240 duplex auto speed auto ! interface FastEthernet0 switchport mode access ! interface FastEthernet1 switchport mode access ! interface FastEthernet2 switchport mode access ! interface FastEthernet3 switchport mode access ! interface Vlan1 ip address 192.168.0.1 255.255.255.0 ! ip classless ip route 0.0.0.0 0.0.0.0 18.104.22.168 !
Example Network Topology:
Grey: Internal Network
Orange: VPN Site to Site (I'll work on this later, I know how to do this part)
Dark Blue: Public Network
1.1.1.X: Represent real public IP addresses.
The right most server:
External IP: 22.214.171.124 / Gateway: 126.96.36.199
Internal IP: 192.168.0.114 / Gateway: None