NAT Lab

[jsblach]

Hi i do have a very simple setup in

GNS3

with two VPCs and two IOUL2 switches.

One switch has the following configuration:

Spoiler

interface Ethernet0/0
switchport access vlan 123
switchport mode access

interface Ethernet1/0
no switchport
ip address 192.168.178.254 255.255.255.0
ip nat outside

interface Vlan123
ip address 192.168.0.254 255.255.255.0
ip nat inside

ip nat inside source list 1 interface Ethernet1/0 overload

access-list 1 permit 192.168.0.0 0.0.0.255

ip route 0.0.0.0 0.0.0.0 192.168.178.1 

If i use ping 192.168.178.1 source vl 123 on the switch, everything works fine and i see an entry
in

sh ip nat trans

. But if i ping 192.168.178.1 from an attached vpc it doesn't work.

Where am i thinking wrong?

Thanks in advance!!!

[MHM Cisco World]

Did you add 

İp routing 

To SW? 

[Flavio Miranda]

Hi

 It woud be a behavior expected IF the PC has not gateway or wrong gateway

[jsblach]

hi, thanks for your answers.

@MHM Cisco World  yes, and if i configure

static routing

instead of

nat

i get a reply.

@Flavio Miranda 

the vpc have gateways

configured, as i said, routing works

nat

doesn't 

[jsblach]

here i have the gns3 project attached

[MHM Cisco World · Accepted solution]

Then dont waste your time' the IOS SWl3 image canot do

NATing.

[jsblach]

ok so you would say, that the configuration in general would be correct?

[MHM Cisco World]

So so correct'

Your config is perfect but there is some bug in

gns3.

[jsblach]

but it does work in this case. why wouldn't it work with a vpc using the svi address as gateway?

[MHM Cisco World]

You are learning and you need to sure that you config is correct'

I will apply same config you share in my lab and share reuslt.

I also have

gns3

and after weeks try solve this issue I give up and use

NSK sw 

instead.

I will share lab tonight dont worry.

MHM

[paul driver]

Hello
instead of using a

VPC node 

, use a

rtr

and disable

ip routing 

on that router so to make it a host device ( ip address & D/G) and test again.