0/0 -Target `” nat-xxxxxxx -Status `” Blackhole -Propagated `” No -What has caused the connectivity issue?
The NAT gateway no longer exists.
There is no route to the internet gateway.
The routes are no longer propagating.
There is no route rule with a destination for the internet.
Explanations:
The “Blackhole” status for the route tonat-xxxxxxxindicates that the NAT gateway no longer exists or is not reachable, which causes the connectivity issue.
There is no need for a direct route to the internet gateway for a private subnet instance; the issue is with the NAT gateway.
Route propagation is not the issue here; the problem is the route to the NAT gateway being blackholed.
The route table contains a valid route for0.0.0.0/0, which points to the NAT gateway, but the NAT gateway is the source of the issue.
To the best of my knowledge, the answer is:
The NAT gateway no longer exists.