Cisco 1811 serving as a router/firewall to several windows 2003 servers at an ISP. Ive configured NAT on the router to expose http, https, and smtp ports on each of the servers to a unique public ip address within my x.x.x.230/29 address space.
The WAN port on the 1811 is configured with x.x.x.230/29. On the ServerA I NAT ports 25, 80, and 443 on that same x.x.x.230 address, while managing the 1811 itself using SSH on that same address as well.
On server B (local ip 192.168.0.3), I NAT the x.x.x.231 for ports 25. 80, and 443. On server C (local ip 192.168.0.4), I NAT the x.x.x.232 address for the same ports.
Can anyone offer a critique of this configuration and offer some ideas of the best practices topology-wise for providing routing, vpn and firewall functionality for these servers?
My question arises because now I have a site to site VPN with Server B at the local end and I am unable to connect to the server B smtp port due to the following nat statements. I can confirm that this is the case since by removing the statement I am able to connect.
Static PAT is the same as static NAT, except it lets you specify the protocol (TCP or UDP) and port for the local and global addresses.
This feature lets you identify the same global address across many different static statements, so long as the port is different for each statement (you CANNOT use the same global address for multiple static NAT statements).
For example, if you want to provide a single address for global users to access FTP, HTTP, and SMTP, but these are all actually different servers on the local network, you can specify static PAT statements for each server that uses the same global IP address, but different ports
And for PAT you cannot use the same pair of local and global address in multiple static statements between the same two interfaces.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.