On 03/05/2010 03:07 PM, Brian Thomason wrote:
> The manpage reflects that multiple -net user calls may be made,
> but if this is done, it can cause the program to hang. Instead,
> multiple -net calls can be combined into one, and this patch adds
> that information to qemu-options.hx. Also, -net user may only
> be used in conjunction with -net nic.  This is already implcitly
> stated, but this patch makes that statement more explicit.

Actually, the problem is that the user created a loop.  It's actually 
valid to have something like:

-net user -net dump,file=foo.pcap -net nic

But having -net user -net user creates a loop.

Regards,

Anthony Liguori

>
> https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/474969
> https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/453617
>
> Signed-off-by: Brian Thomason <brian.thomason@canonical.com 
> <mailto:brian.thomason@canonical.com>>
> ---
>  qemu-options.hx |   15 +++++++++++++--
>  1 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index fd50add..724f434 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -952,7 +952,8 @@ for a list of available devices for your target.
>
>  @item -net user[,@var{option}][,@var{option}][,...]
>  Use the user mode network stack which requires no administrator
> -privilege to run. Valid options are:
> +privilege to run. Please note that this can be used only in 
> conjunction with
> +@option{-net nic}. Valid options are:
>
>  @table @option
>  @item vlan=@var{n}
> @@ -1028,7 +1029,8 @@ the guest IP address @var{guestaddr} on guest 
> port @var{guestport}. If
>  @var{guestaddr} is not specified, its value is x.x.x.15 (default 
> first address
>  given by the built-in DHCP server). By specifying @var{hostaddr}, the 
> rule can
>  be bound to a specific host interface. If no connection type is set, 
> TCP is
> -used. This option can be given multiple times.
> +used. This option can not be given multiple times, but multiple rules may
> +be combined.
>
>  For example, to redirect host X11 connection from screen 1 to guest
>  screen 0, use the following:
> @@ -1052,6 +1054,15 @@ telnet localhost 5555
>  Then when you use on the host @code{telnet localhost 5555}, you
>  connect to the guest telnet server.
>
> +To combine two or more hostfwd rules, simply use a comma as a 
> delimiter. For
> +example, to combine the two rules mentioned in the examples above, 
> use the
> +following:
> +
> +@example
> +#on the host
> +qemu -net user,hostfwd=tcp:127.0.0.1:6001-:6000,hostfwd=tcp:5555-::23 
> [...]
> +@end example
> +
>  @item guestfwd=[tcp]:@var{server}:@var{port}-@var{dev}
>  Forward guest TCP connections to the IP address @var{server} on port 
> @var{port}
>  to the character device @var{dev}. This option can be given multiple 
> times.
> -- 
> 1.6.3.3
>