Hello everyone,
After an AR router is deployed, the AR router accesses the network for the first time. Users cannot access the Internet.
Possible Reason
1. NAT configuration error
2. Default route configuration error
3. DHCP configuration error
Troubleshooting steps
1. Use the Ping command. Ping the public IP address to test the network connectivity.
If the ping is successful, the network connectivity is normal, and the default route and DHCP configuration are normal. Check whether the NAT configuration is normal.
If the ping fails, check whether the default route, DHCP, and NAT configuration are normal.
2. Check whether the DHCP configuration on the device is correct. If users want to access the Internet, the AR router functions as the gateway and needs to be configured as a DHCP server to assign IP addresses to private network users.
Interface address pool configuration
[Router] dhcp enable [Router] interface vlanif 10 [Router-Vlanif10] ip address 192.168.1.1 24 [Router-Vlanif10] dhcp select interface
Global address pool configuration
[Router] dhcp enable [Router] ip pool pool1 [Router-ip-pool-pool1] network 192.168.1.0 mask 255.255.255.0 [Router] interface gigabitethernet 1/0/0 [Router-GigabitEthernet1/0/0] ip address 192.168.1.1 24 [Router-GigabitEthernet1/0/0] dhcp select global
3. Check whether the default route is correctly configured on the device. If the user wants to access the Internet, ensure that the route between the AR router and the public network is reachable.
Run the display current-configuration | include route-static command to check the default route configuration.
If the default route is not configured or is incorrectly configured, run the ip route-static command to reconfigure the default route.
4. Check whether the NAT configuration on the device is correct. If users want to access the Internet, the NAT outbound function needs to be configured on the AR router.
Easy IP mode
[Router] acl number 2000 [Router-acl-basic-2000] rule 6 permit source 192.168.0.0 0.0.0.255 [Router] interface gigabitEthernet0/0/1 [Router-GigabitEthernet1/0/0] ip address 10.1.1.1 24 [Router-GigabitEthernet1/0/0] nat outbound 2000
NAT address pool mode
[Router] acl number 2000 [Router-acl-basic-2000] rule 6 permit source 192.168.0.0 0.0.0.255 [Router] nat address-group 1 10.1.1.100 10.1.1.200 [Router] interface gigabitEthernet0/0/1 [Router-GigabitEthernet1/0/0] ip address 10.1.1.1 24 [Router-GigabitEthernet1/0/0] nat outbound 2000 address-group 1
That is all I want to share with you!
