Beginners help - ip routing

[JonasLindberg58921]

Hello Folks.

Tried to do my research but cant seem to find the simple thing as I am looking for (which I hope aint that hard to accomplish)

Im a true beginner of the cisco experience and cant say I know much yet, but I'm learning slow and steady! ;)

Just wanted to get some help with my first little test.

I wonder if its possible to reroute the incoming ip adress

for ie

ip: 167.10.123.211

Subnet: 255.255.255.0

Default gateway: 167.10.123.1

to the switch to be something else like

ip: 10.10.1.2 /12

Whenerver Im trying to set the unique ip I loose my internet connection.

I will most likely ask "stupid" questions, but hope someone is willing to teach me a way to make this work ;)

Setup

Switch - 3560

Router -> Switch (port 1)

Switch -> comp 2-12

[Reza Sharifi]

Hi,

I will most likely ask "stupid" questions, but hope someone is willing to teach me a way to make this work ;)

That is not only not stupid, it is actually a good question!

ip: 167.10.123.211

Subnet: 255.255.255.0

Default gateway: 167.10.123.1

to the switch to be something else like

ip: 10.10.1.2 /12

167.10.123.211 is a public IP address which means it is route-able over the Internet.

10.10.1.2 is a private address (research RFC1918 private address networks) and so it can't be routed over the Internet.

So, in order to go from 10.10.1.2 to 167.10.123.211, you need to use NAT (research Network Address Translation). Without NAT 10.10.1.2 address will not reach the Internet and that is the reason when you change the IP on the switch you lose connectivity to Internet.

Switch - 3560

Unfortunately, the Cisco 3560 series switches do not support NAT. So, you need a router or a firewall to perform NAT for you if you want to use a private IP.

HTH

[Martin L]

I think you talking about NAT/PAT that must be set up on router to let your public IP to be translated into Private one.