Cisco 1941 Router connecting to NetGear Router

[lfleisher]

Hello!

I'm a networking Student and I've recently made bounds and leaps in my HomeLab (trivial to some of you but huge to me).

I'm running into one issue that my hours of Youtube and Googling I have not been able to come up with an answer.

Here is a Topographical view of my Network:

For Hardware I have:

Cisco 1941 Router x1

Cisco 2960 Switch x1

Windows 11 Laptop x2

Windows Server x1

NetGear Router

(The computers are running Windows, they obviously aren't enterprise)

Network Information:

I have the following VLAN's and associated pools:

• VLAN5: (NATIVE)
• VLAN99: 172.16.255.0 /24
• VLAN201: 10.0.255.0 /28
• VLAN300: 10.0.0.0 /24
• VLAN800: 192.168.1.0 /27

Inter-vlan Routing works along with DHCP Helper handing out addresses from each pool.

On my Cisco Switch I have Interface G0/0 set to accept a DHCP address from my NetGear router. My intent is to route the information from my HomeLab out to the internet so I can move on a finish my routing/switching and get into security labbing.

Interface G0/0 has a 172.16.0.3 address as given by my NetGear Router (172.16.0.1 Gateway).

Interface G0/1 does not have an assigned IP Address but has Sub-interfaces:

• G0/1.5 (NATIVE)
• G0/1.99
• G0/1.201
• G0/1.300
• G0/1.800

From the CLI on the router I can ping out to Google (8.8.8.8) I can also ping the HomeLab LAN.

However, I run into an issue when attempting to ping from G0/1 -> G0/0 and vice-versa. I've tried setting up IP NAT inside, outside and access-lists. I have attached the Routers SH RUN.

Does anyone have any advice? 

[balaji.bandi · Accepted solution]

Try below config :

no ip default-gateway 172.31.255.1
no ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 172.16.0.1
no ip route 0.0.0.0 0.0.0.0 172.16.0.1 254
no ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 dhcp
!
ip route 0.0.0.0 0.0.0.0 172.16.0.1

!
access-list 1 permit ip 192.168.1.0 0.0.0.255 any
access-list 1 permit ip 172.16.255.0 0.0.0.255 any
access-list 1 permit ip 10.0.255.0 0.0.0.255 any


nterface GigabitEthernet0/1.99
ip nat inside
!
interface GigabitEthernet0/1.201
ip nat inside
!
interface GigabitEthernet0/1.300
ip nat inside
!
interface GigabitEthernet0/1.800
ip nat inside
!

[lfleisher]

This worked! thank you so much!