Hello,
who is your ISP ? Make sure you don't need any authentication, otherwise you need to use a dialer interface.
For now, make the changes marked in bold:
!
ip cef
!
--> ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool ahmad
import all
network 192.168.1.0 255.255.255.0
dns-server 208.67.222.222 8.8.8.8
default-router 192.168.1.1
!
--> no ip dhcp-server 192.168.1.0
no ipv6 cef
!
multilink bundle-name authenticated
chat-script lte "" "AT!CALL1" TIMEOUT 30 "OK"
license udi pid C819G-4G-G-K9 sn FCZ1724C2NY
!
vtp mode t! t
!
controller Cellular 0
!
interface Cellular0
ip address negotiated
ip nat outside
ip virtual-reassembly in
encapsulation slip
dialer in-band
dialer string lte
dialer-group 1
async mode interactive
!
interface FastEthernet0
no ip address
!
interface FastEthernet1
no ip address
!
interface FastEthernet2
no ip address
!
interface Fastt3
no ip address
!
interface GigabitEthernet0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0
no ip address
shutdown
clock rate 2000000
!
interface Vlan1
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
ip forward-protocol nd
no ip erver
no ip http secure-server
!
--> ip nat inside source list 1 interface Cellular0 overload
ip route 0.0.0.0 0.0.0.0 Cellular0
!
--> access-list 1 permit 192.168.1.0 0.0.0.255
!
dialer-list 1 protocol ip permit
!
control-plane
!
line con 0
no modem enable
l
line 2
no activation-character
no exec
transport preferred none
transport input all
stopbits 1
line 3
exec-timeout 0 0
script dialer lte
modem InOut
no exec
rxspeed 100000000
txspeed 50000000
line vty 0 4
login
transport input all
!
scheduler allocate 20000 1000
!
end
