Re: Request for Support: QEMU IPv6 Port Forwarding Issue

[Samuel Thibault <samuel.thibault@gnu.org>]

Hello,

Thomas Huth, le mar. 19 mars 2024 15:28:12 +0100, a ecrit:
> On 19/03/2024 06.53, Srinivasu Kandukuri (MS/ECP2-ETAS-VOS) wrote:
> > Dear QEMU Support Team,
> > 
> > We are currently encountering difficulties in utilizing QEMU for
> > starting a virtual machine image on Windows with IPv6 networking,
> > specifically related to port forwarding. We are using QEMU emulator
> > version 7.1.93 (v7.2.0-rc3-11946-gb68e69cdcc-dirty).
> > 
> > Our objective is to establish IPv6 network connectivity within the
> > virtual machine and forward ports to allow external access. However, we
> > are encountering errors when attempting to configure the port forwarding
> > mechanism.
> > 
> > Here is the command we are using:
> > 
> > *qemu-system-x86_64: -netdev user,id=net1,ipv6=on,ipv6-net=fe80::5054:ff:fecd:585a/64,hostfwd=tcp::2210-[fe80::5054:ff:fecd:585a]:22*
> > 
> > However, upon executing this command, we encounter the following error:
> > 
> > *Invalid host forwarding rule 'tcp::2210-[fe80::5054:ff:fecd:585a]:22'
> > (Bad guest address)*
> > 
> > We understand that the format for specifying host forwarding rules
> > follows the pattern:
> > 
> > *protocol:[listen_address]:listen_port-[dest_address]:dest_port*
> > 
> > We believe that we are following this pattern correctly, but still, we
> > are encountering errors.
> 
> Looking at the code:
> 
>  https://gitlab.com/qemu-project/qemu/-/blob/v8.2.0/net/slirp.c#L824
> 
> it seems like QEMU is only using inet_aton() here, which means IPv4 only,
> sorry, but this likely needs some additional changes first to support IPv6
> addresses here.

Nicholas Ngai's work is still pending integration:

https://lists.gnu.org/archive/html/qemu-devel/2022-03/msg05643.html
https://gitlab.com/qemu-project/qemu/-/issues/347

Samuel