this has been the typical configuration that i have tried many times
cell 0 create 1 lte profile # Create a cellular profile
ipv4 primary dns-server 8.8.8.8 # Replace with your preferred IPv4 DNS server
ipv6 primary dns-server 2001:4860:4860::8888 # Replace with your preferred IPv6 DNS server
exit
interface Cellular0
ip address negotiated
ip nat outside
encapsulation slip
dialer in-band
dialer string your-APN-name-here # Replace with your carrier's APN
dialer-group 1
async mode interactive
lte profile 1 # Apply the cellular profile created earlier
exit
interface GigabitEthernet0 # This is for LAN connectivity
ip address 192.168.1.1 255.255.255.0 # Replace with your LAN IP details
ip nat inside
exit
interface GigabitEthernet1 # This is for WAN connectivity (Internet)
ip address dhcp # Assuming it's a DHCP connection from your ISP
ip nat outside
exit
access-list 1 permit 192.168.1.0 0.0.0.255 # Replace with your internal network details
ip dhcp excluded-address 192.168.1.1 # Exclude the router's LAN IP from DHCP pool
ip nat inside source list 1 interface Cellular0 overload
ip nat inside source list 1 interface GigabitEthernet1 overload # For WAN connection
ip route 0.0.0.0 0.0.0.0 GigabitEthernet1 # Set the default route to use Gig1 for internet
ip dhcp pool LAN
network 192.168.1.0 255.255.255.0 # Specify your LAN network range
default-router 192.168.1.1 # Default gateway for DHCP clients
dns-server 8.8.8.8 # Replace with your preferred DNS server
exit
