SSH has no Host header

The challenge of implementing SSH access for virtual machines (VMs) at exe.dev is addressed by using a pool of public IPv4 addresses due to the high cost of assigning individual IP addresses and the limitations of IPv6. While web traffic can share IP addresses by using the Host header, SSH lacks a similar feature, complicating the routing of connections. To overcome this, exe.dev assigns each VM a unique IP address relative to its owner, allowing the {user, IP} tuple to uniquely identify connections. The process involves careful IP allocation and requires bespoke management software, as public IPs are often NATed in cloud environments. This system was specifically developed to ensure uniform domain name behavior for exe.dev, though it is not recommended as a general solution for others seeking to multiplex SSH access.

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