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ADLS_WAN Link Failover The problem of internal network user cannot access public network

Publication Date:  2012-09-22 Views:  40 Downloads:  0
Issue Description
As the picture to display ,when the ADSL link and WAN link do the failover and the configuration of NAT and failover static route is right ,the USG2160 configure global DHCP ,internal network PC cannot access public network.
Alarm Information
None.
Handling Process
In the DHCP global configuration ,add Gateway-list,when PC gets the IP of DHCP ,it will get the ip of gateway 192.168.3.1:
[USG2160-dhcp-aa]di th
dhcp server ip-pool aa
network 192.168.3.0 mask 255.255.255.0
gateway-list 192.168.3.1 //若没配,PC无法获得GW IP,可以获得DHCP server IP
dns-list 8.8.8.8
expired unlimited
It can ping the external network
Root Cause
As the PC gets the IP which is got by global DHCP of USG2160 ,there is no IP of gateway by checking :
[USG2160-dhcp-aa]di th
dhcp server ip-pool aa
network 192.168.3.0 mask 255.255.255.0
dns-list 8.8.8.8
expired unlimited
It cannot ping external network :

PC data packet cannot pass by Vlanif1 192.168.3.1 gateway to go out,it cannot reach 192.168.1.105 to do NAT .So it cannot access external network.
Suggestions
As there are many Vlanif interface ,wan interface on the USG2160 ,it has multi route gateway IP ,when we configure gateway-list ,we need choose the correct gateway IP

END