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Plutext
Asked: 2013-05-12 20:00:54 +0800 CST

my IP address is different to remote address at EC2

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I have been trying to restrict access to a port on an EC2 box to a single remote computer (my desktop).

The various "what is my IP" services around on the Internet all consistently report an IP address IP1.

However, when I look in the access logs on the EC2 box, I see my address is actually recorded as IP2.

Not surprisingly, restricting access only works properly (via EC2's security group rules, or iptables) when I use this IP2 address.

Now my question: is it Amazon EC2 which is translating my address as some point, or are all the "what is my IP" services (consistently) wrong? Either way, what is different about EC2?

amazon-ec2

1 Answers

  1. usually most illogical issues have the most trivial explanation... Try checking your source IP against EC with something that is not proxy-prone/easy-to-manipulate. e.g. on EC2: #tcpdump -n -i any icmp on your PC: ping of course you have to open ICMP from any at AWS firewall for this ...

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