Re: Port Forwarding between host-guest via passt using QEMU-libvirt

[David Gibson <david@gibson.dropbear.id.au>]

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On Sun, Oct 26, 2025 at 02:47:19PM -0500, James Sinton wrote:
> Hi All,
> 
> I'm having trouble getting host-to-guest port forwarding to work via passt
> for a userspace connection:
> 
> Please see my post on Superuser for more details:
> 
> https://superuser.com/q/1927306/3115375?sem=2

Sorry it's taken me a while to look at this.

It looks like passt is accepting the ssh connection, but unable to
itself connect to the guest.  Unfortunately there aren't really any
clues as to why, so far.

A couple of easy bits of information which might help:
  1. What's the passt version? (`passt --version` on the host)
  2. What's the IP configuration within the Windows guest?
  3. What's the IP configuration on the host? (`ip addr show` and `ip
     route show`)
  4. What's the output from `ssh -v`

That information might supply some clues, but it's pretty likely we'll
need debugging or packet capture output from passt to work this out.
Unfortunately, that's a bit trickier than it should be because libvirt
doesn't (yet) have the ability to pass the necessary options to passt.
Let's start with the information above, then we can work out the steps
to get more detailed debugging information if we need it.

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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