Description
This article describes how to disable the ability for the PPOoE interface to automatically insert a default static route in the routing table.
Scope
FortiGate.
Interface with PPPoE mode:
show system interface port3
config system interface
edit "port3"
set vdom "root"
set mode pppoe
set type physical
set snmp-index 3
set username "username”
set password ENC “password”
next
end
Verification of the default route in the routing table with interface ‘ppp’
get router info routing-table database
Routing table for VRF=0
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
> - selected route, * - FIB route, p - stale info
S *> 0.0.0.0/0 [5/0] via 10.11.1.4, ppp0 <- PPPoE.
S 0.0.0.0/0 [10/0] via 10.10.1.4, port1
C *> 10.10.0.0/20 is directly connected, port1
C *> 10.11.1.0/24 is directly connected, ppp0
Solution
By default, when the interface with the PPPoE mode is configured and once the IP address settings is given from the PPPoE server and the interface is up, a default route with the interface ‘ppp’ is automatically inserted in the routing table.
For example:
Port1 = Static IP connection
Port2 = PPPoE connection
To disable the automatic insertion of the default route by the PPPoE interface, follow the steps via GUI or CLI:
From the GUI:
Disable the option 'Retrieve default gateway from server' under the PPPoE interface setting.
For example: port3 is used as PPPoE connection:
Go to Interfaces -> select port3 and Edit -> disable the option 'Retrieve default gateway from server' -> Save the setting by selecting 'OK'.
From the CLI:
conf sys interface
edit port3
set defaultgw disable
end
defaultgw --- Enable to get the gateway IP from the DHCP or PPPoE server.
Verification of the default route in the routing table with interface 'ppp'.
get router info routing-table database
Routing table for VRF=0
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
> - selected route, * - FIB route, p - stale info
S *> 0.0.0.0/0 [10/0] via 10.10.1.4, port1
C *> 10.10.0.0/20 is directly connected, port1
C *> 10.11.1.0/24 is directly connected, ppp0
In the above routing table, the default route with the interface ‘ppp’ is not inserted.
