[vbox-dev] NAT: port forwarding issues / collision

Alexey Eromenko al4321 at gmail.com
Wed Jan 7 10:18:03 UTC 2015

Host: Windows 7, Core i7, VBox 4.3.18
Guests: Linux, RHEL6 (CLI-only)

Setup localhost + 2 web servers VMs.

VM1: NAT host at 1443 -> guest:443 (default IP)
VM2: NAT host at 2443 -> guest:443 (default IP)

I connect by typing in local web browser:

When I connect via HTTPS to first VM, it's okay, but when I connect to
second VM, the first one disconnects (connection timeout), and then I
get access to 2nd VM, and after I try to reconnect to 1st VM, 2nd VM
immediately disconnects, so there is some collision between NAT engine
on both VMs.
No way to connect to both VMs, from localhost web browser.

Not sure why this happens, as SLIRP NAT module is supposed to be
user-space, per-VM process.

Any ideas?
-Alexey Eromenko "Technologov"

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