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Starlink adding static routes

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sven

New Around Here
Hi,

I have a RT-AC66U B1 3.0.0.4.386_46065 and have a dual WAN setup
- primary is Cable
- secondary is Starlink

When not using the dual wan I have in the routing table:
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
208.67.220.220 192.168.0.1 255.255.255.255 UGH 0 0 0 vlan2
208.67.222.222 192.168.0.1 255.255.255.255 UGH 0 0 0 vlan2
192.168.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 vlan2
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 vlan2
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 vlan2

-> All looks good and works fine

When I configure and enable Starlink as failover I get in the routing table:

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.100.1 0.0.0.0 255.255.255.255 UH 0 0 0 vlan3
34.120.255.244 0.0.0.0 255.255.255.255 UH 0 0 0 vlan3
208.67.220.220 192.168.0.1 255.255.255.255 UGH 0 0 0 vlan2
208.67.222.222 192.168.0.1 255.255.255.255 UGH 0 0 0 vlan2
192.168.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 vlan2
1.1.1.1 100.64.0.1 255.255.255.255 UGH 0 0 0 vlan3 ?????????
8.8.8.8 100.64.0.1 255.255.255.255 UGH 0 0 0 vlan3 ?????????
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 vlan2
100.64.0.0 0.0.0.0 255.192.0.0 U 0 0 0 vlan3
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 vlan2

Why does Starlink add these static routes. Because of it I can no longer ping 8.8.8.8 and 1.1.1.1 from my PC (since the interface in in Standby and not forwarding traffic)?

When I disable the primary WAN (cable) via the GUI I get:

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.100.1 0.0.0.0 255.255.255.255 UH 0 0 0 vlan3
34.120.255.244 0.0.0.0 255.255.255.255 UH 0 0 0 vlan3
1.1.1.1 100.64.0.1 255.255.255.255 UGH 0 0 0 vlan3
8.8.8.8 100.64.0.1 255.255.255.255 UGH 0 0 0 vlan3
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
100.64.0.0 0.0.0.0 255.192.0.0 U 0 0 0 vlan3
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo

Where is the default route pointing to the Starlink? It's not added during failure so it doesn't work.

Any ideas?

Thanks,
Sven.
 
Does this apply? :

Can I add a 3rd party router or mesh system?

Yes, you are welcome to connect your own equipment to Starlink. However, we cannot guarantee Starlink performance or compatibility with 3rd party routers or mesh systems. Additionally, the Starlink App may not work as expected when using 3rd party routers.
Circular_500x500.png
Please be aware that the Starlink router does not have a router bypass mode. If you use your own router or mesh system, we recommend physically removing the included Starlink router and using the 3rd party equipment exclusively with the power supply. We do not recommend using Starlink in a dual LAN system, or placing network switches inline with the Starlink and the Starlink/third party router.
| |
| |
Rectangular_500x500.png
| To connect a 3rd party router or mesh system, you will need to purchase the Ethernet Adapter from the Starlink Shopto allow for a wired connection to the network. Bypass mode can be enabled via the Starlink App under "Settings". Bypass mode will completely disable the built-in Starlink WiFi router functionality. An Ethernet Adapter is required to use this feature. A manual factory reset is required to reverse the setting. We are actively working on development of a Starlink mesh product. |


Will Starlink provide a publicly routable DHCP or Static IP IPv4 address?

Yes. Starlink plans to support this functionality in the future. We do not yet have an estimated time when this will be available to customers.

What IP address does Starlink provide?


Starlink today currently provides a DHCP issued Carrier Grade NAT (CGNAT) non-routable IPv4 address in the 100.64.0.0/10 range.
Note - as Starlink continues to expand and upgrade our global internet service infrastructure and rollout new capabilities, some users may see different IP address behavior (ex. publicly routable addresses, IPv6, non-CGNAT)

How can I get additional IPv4 addresses?

We currently only support one issued IP address per Starlink at this time.
While some customers may be able to receive multiple IP addresses today, this is subject to be limited to one as we continue to rollout additional new infrastructure.
 
You can blame/credit ASUS for this.

Starting w/ 386.4 (iirc), ASUS decided to statically bind the WAN's DNS servers to the WAN (presumably to prevent problems w/ the WAN connectivity check). That's why the following lines exist for the primary WAN.

Code:
208.67.220.220  192.168.0.1     255.255.255.255 UGH       0 0          0 vlan2
208.67.222.222  192.168.0.1     255.255.255.255 UGH       0 0          0 vlan2

Once you added the secondary WAN, it did the same for it as well.

Code:
1.1.1.1         100.64.0.1      255.255.255.255 UGH       0 0          0 vlan3
8.8.8.8         100.64.0.1      255.255.255.255 UGH       0 0          0 vlan3
 

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