Can't connect to via ssh to second NIC on RHEL aws

Question

I want an EC2 host with 2 NICs, one for administration and one for hosting a few server processes.

I successfully cloud form'd a host with 2 NICs, each with their own elastic IP. I expect I can SSH into the box from either IP, but I can only connect via the IP assigned to eth0. Connecting via eth1 just hangs.

• Tried setting up a second SSHD to bind on eth1, didn't work.
• Turned off SELinux, also didn't work.

What do I need to do to connect to SSH on eth1?

#Just Hangs
chronos@localhost / $ ssh -v [email protected]
OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 1: Applying options for *
debug1: Connecting to 35.166.185.195 [35.166.185.195] port 22.

My cloudformation file (uses the rhel7 ami in US-West-2, Oregon): https://s3-us-west-2.amazonaws.com/cf-templates-11rdba5328vvk-us-west-2/2016359ImH-cf2.txt

Also, tried attaching using NetworkInterfaceAttachment instead of the Instance's NetworkInterfaces property, same problem: https://s3-us-west-2.amazonaws.com/cf-templates-11rdba5328vvk-us-west-2/2016359ttS-cf2.txt

Answer 1

I would first of all verify that eth1 was capable of connecting outside. I'd probably do this with ssh -b 35.166.185.195 <known good host>. I'd check that sshd was listening in the expected address and ports using ss -tnlp. Then I'd check that the firewall was not blocking packets. If all of those are good then the problem lies outside the box. Perhaps you need to do something with security groups ?