Multiple network interfaces - No SSH access

Question

Hi!  
  
I've created a t2.medium instance (Singapore region) with two network interfaces (eth0 and eth1) and I've tried using both the Ubuntu AMI from Amazon, and the Debian 9/Stretch AMI from Debian.   
  
So far for both setups, I've enabled an Elastic IP for eth0, with a correspoding security group which lets me SSH into my server. My problem occurs straight away when I attach the second network interface (eth1), this interface is being attached without any Elastic IP (but it will have one in the future), once the eth1 interface is attached to the instance, the Elastic IP for eth0 stops responding on SSH, and I cannot SSH into my server anymore.  
  
Does anyone have any tips on what is happening here, and how to resolve it?

Answer

Got this working by adding the code below into the netplan configuration for Ubuntu. The problem was caused by double default routes. The configuration below removes the default route for eth1.  
  
dhcp4-overrides:  
    use-routes: false

Answer

Hi hegga,  
  
I'm glad that you were able to solve the issue. Please let us know if you need any further help.  
  
Regards,  
awstomas

Multiple network interfaces - No SSH access

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