I need some ideas in configuring NAT on my new 2811 router
I am planning to use my 2811 router for routing, firewall and also to do NAT to my LAN.
I have installed an HWIC T1 DSU/DSU card as serial interface and the router comes with two fast ethernet ports
My ISP is giving me an csu/dsu handoff and have given me the ip address I have to assign on my serial interface.I have purchased 50 public IPs from the ISP also.
I am planning to terminate the Fa0/0 interface on the existing LAN switches which have private IP assigned.
My question is what addresing should I give to my Fa0/0 interface, is it going to be the public IP address I have purchased from the ISP or the private IP address of the LAN. and how will I perform NATing on the interface
since you say you have purchased 50 public IP address from ur ISP, you need not do any NAT on the router, 1 of the public IP address should configured in fastethernet 0/0 & rest eg. for ur web,ftp,mail servers etc..., as also make 1 as a IGS(Internet Gateway Server) which will have 2 NIC 1 will point towards Internet Router & other pointing towards LAN having Private IP Address. by doing this you need not do NAT on the router rather you need to do NAT on the IGS can be a LINUX/Windows OS. if you still say that you wanted to do NAT on the router, below are the configuration
description "To Internet"
ip address 18.104.22.168 255.255.255.252
ip nat outside
description " To LAN"
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip nat translation timeout 3600
ip nat pool test 22.214.171.124 126.96.36.199 netmask 255.255.255.240
ip nat inside source list 1 pool test overload
these are the NAT command on the router, if you still say that you wanted to hav a public server like ftp,mail,web inside ur office & also LAN to be connected, juz add a secondary IP as public.
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