It shouldn't be surprising that their recommendations are to do routing in the network hardware, rather than the VM host. They are a vendor of software for network hardware, not the compute hosts, after all. » about 300 words
Jump to section: Availability zones and regions VPCs Elastic IPs and Elastic Network Interfaces Network performance Resources by scope Connectivity by scope Availability zones and regions AWS’ primary cloud is available in 15 regions, each with two to six availability zones, not including separately operated regions (with independent identity) for GovCloud and China. » about 4600 words