AWS with EIP public ip address setup

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AWS with EIP public ip address setup

L0 Member

Hi All, pretty dumb question here. I've setup the VM-series in AWS and attached three interfaces to the box. The intention here is to setup NAT (due to overlapping IP space)  over a site-to-site VPN.


* management, I can get to this just fine and use the web console etc (call this

* "inside" attached to eth1/1, is connected to our private network ( call this

* "outside" attached to eth1/2, is connected to our public network in AWS and has an EIP associated (associated address is


eth1/1 and eth1/2 are setup using DHCP in AWS, with eth1/2 having un-checked the "Automatically create default route to default gateway provided by server"  box. 


The question is where/how does one configure the "public or outside" interface to reach the internet via the EIP? I can't seem to get traffic to flow out that interface (using the EIP) no matter what set of routes I put in place.




L1 Bithead

To egress the internet from your 'public' interface, you'll need to put it into a Public AWS subnet.  For this subnet in the aws route tables you'll route to the Internet Gateway (IGW).  Also set an EIP on your Eth1/2 ip address.  The IGW does the nat translation as it leaves to the internet. 

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