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APZ
Asked: 2012-07-27 15:43:15 +0800 CST

AWS VPC Multiple IPs

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I am trying to associate a secondary internal IP with my Amazon VPC small machine, I am using a Ubuntu based image with AMI ID:ami-6936fb00. Problem is that I am unable to figure out how to configure my OS(Ubuntu) to record the second private IP address ( this is required as mentioned in the AWS Docs: http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-instance-addressing.html#using-instance-addressing-eips)!

I have single ENI and have associated one extra private IP with it.

Any help would be appreciated.

Thanks

amazon-web-services

2 Answers

  1. Best Answer

    Your /etc/network/interfaces file probably has something like the following:

    auto eth0
iface eth0 inet static
    address 192.0.2.10
    netmask 255.255.255.0
    gateway 192.168.2.1

    This is what assigns the primary IP (it may also be DHCP). To assign a secondary IP add a post-up script to attach an additional address to eth0.

    auto eth0
iface eth0 inet static
    address 192.0.2.10
    netmask 255.255.255.0
    gateway 192.168.2.1
    up ip addr add 192.168.2.20/24 dev eth0
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  2. I was finally able to figure out how to record second private IP for my AWS VPC machine: I appended this to /etc/network/interfaces:

    auto eth0:0
iface eth0:0 inet static
    address 192.x.y.z
    netmask 255.255.255.0

    and then running ifup eth0:0

    My ifconfig showed both eth0 and eth0:0 with correct private IPs.

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