Cannot access internet from L3 switch

[moman62]

Hello,

I have a cisco 3750E switch and a cisco 2921 router, I have configured the router with information to connect with my isp. On my switch, I enabled a port with the no switch command so that I could use it for routing, I am unable to access the internet from my pc's

3750E Switch:

int gi 1/0/40

no switchport

ip address 192.168.1.40 255.255.255.0

ip route 0.0.0.0 0.0.0.0 192.168.1.1

[Georg Pauwen]

Hello,

on the router, you need to make sure that the networks connected to the switch are included in the NAT translation access list.

Post the full configurations of both the router and the switch...

[luis_cordova]

Hi @moman62 

Queries:
Is your LAN network, connected to the switch, included in the NAT parameters?
Does the router have a route to reach your LAN, connected to your switch?

Regards

[paul driver]

Hello

is your rtr performing NAT for your lan subnet if not it needs to as your that subnet isn’t a public routable address.

[moman62]

2921 Router:

int g0/0

ip address 192.168.1.x 255.255.255.0

ip nat inside

int g0/1

ip address 27.81.25.30 255.255.255.x - ISP

ip nat outside

ip route 0.0.0.0 27.81.25.30

access-list

192.168.1.x 255.255.255.0 allow

[Georg Pauwen]

Hello,

the access list needs to include the subnets of the client PCs connected to the switch. If these are 192.168.x.x networks, change the access list to e.g.:

access-list 1 permit 192.168.0.0 0.0.255.255

[luis_cordova]

Hi @moman62 

Try this:

2921 Router:

int g0/0

ip address 192.168.1.1 255.255.255.0

ip nat inside

int g0/1

ip address 27.81.25.30 255.255.255.x - ISP

ip nat outside

ip route 0.0.0.0 <next hop>

ip route <network connected to your switch> 192.168.1.40

access-list

<network connected to your switch> allow

Regards

[paul driver]

Hello

Can you amend the following:

no ip route 0.0.0.0 27.81.25.30

ip route 0.0.0.0 27.81.25.x.<—- This will be   Your next hop of the your router 

ip nat inside source list < access-list > interface gig0/1