Make Secondary Network Interface Work in Ubuntu EC2 Instance
Adding a secondary network interface to a non-Amazon Linux EC2 instance causes traffic flow issues. These issues occur because both the primary and the secondary network interfaces are in the same subnet, and there is only one routing table with one gateway. Traffic that comes into the secondary network interface leaves the instance using the primary network interface. But this isn't allowed, because the secondary IP address doesn't belong to the MAC address of the primary network interface.
To make the secondary interface work, create a secondary network configuration file, configure the routing table, and then set up rules in the custom routing table policy database so that traffic for the secondary interface uses the new routing table.
Note: The steps for adding a secondary network interface are different for each of the following Ubuntu versions:
- Ubuntu 14.04
- Ubuntu 16.04
- Ubuntu 18.04
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