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userdoc:tt_wan_failover [2018/11/16 06:12]
mkeuter [Failover Interface Settings] |
userdoc:tt_wan_failover [2019/03/31 17:17]
mknill [PPPoE on Failover Interface] |
| ===== PPPoE on Failover Interface ===== | ===== PPPoE on Failover Interface ===== |
| |
| AstLinux supports at most one instance of PPPoE internally, which can be defined for the primary external interface via the Network tab. If instead, you want to use the only instance of PPPoE for the failover external interface, you need to manually define a few variables in the user.conf file. | AstLinux supports at most one instance of PPPoE internally, and when configured, it is always the Default Route destination. |
| | If you need PPPoE for the failover external interface, your only options are to perform the PPPoE encapsulation on another device. |
| |
| In this example, PPPoE is configured on the Failover interface using the interface ''eth2''... | This can be achieved in two ways: |
| | * Terminating the WAN connection with a PPPoE capable router. In this scenario both Astlinux and the router will perform NAT which can be problematic for some traffic types such as voice. If voice traffic is being tunnelled through a VPN however, this should not be an issue. |
| PPPOEUSER="user" | * Terminating the WAN connection with a PPPoE capable modem configured into half bridge mode. In this scenario, the modem authenticates via PPPoE but bridges the Public IP Address to the Astlinux failover external interface via DHCP. This may be a better solution as an extra NAT is not added to the network path. |
| PPPOEPASS="pass" | !!Note ->!! If you are using half bridge mode, unless you have a static IP Address from your ISP the modem will not update the IP when it is changed until the next dhcp renewal. Due to this, most half-bridge modems use extremely short dhcp lease times which is not optimal. It is better to avoid dynamic IP's altogether and set the Astlinux failover external interface statically to the Public IP, with the DHCP client disabled in the modem. |
| PPPOEIF="eth2" | |
| EXT2IF="ppp0" | |
| | |
| As an alternative, some PPPoE modems can be configured to perform the PPPoE functionality in the modem and offer an IP address via DHCP to the connected client. In this setup an instance of PPPoE internally is not required. This is a good solution if the modem can be configured in "bridge" mode that does not add an extra NAT to the network path. | |
| |
| ===== Example: 4G/LTE Modem Failover ===== | ===== Example: 4G/LTE Modem Failover ===== |