Amazon AWS enhanced networking compatibility issue
With this enhancement, there is a compatibility issue with 5.6.2 and older AWS VM versions. After downgrading a 6.4.14 image to a 5.6.2 or older version, network connectivity is lost. Since AWS does not provide console access, you cannot recover the downgraded image.
When downgrading from 6.4.14 to 5.6.2 or older versions, running the enhanced NIC driver is not allowed. The following AWS instances are affected:
C5 C5d C5n F1 G3 G4 H1 I3 I3en |
Inf1 m4.16xlarge M5 M5a M5ad M5d M5dn M5n P2 |
P3 R4 R5 R5a R5ad R5d R5dn R5n T3 |
T3a u-6tb1.metal u-9tb1.metal u-12tb1.metal u-18tb1.metal u-24tb1.metal X1 X1e z1d |
A workaround is to stop the instance, change the type to a non-ENA driver NIC type, and continue with downgrading.