ipfw: getsockopt(IP_FW_ADD): Invalid argument

[Unga]

--- On Tue, 7/5/11, Ian Smith <smithi at nimnet.asn.au> wrote:

> From: Ian Smith <smithi at nimnet.asn.au>
> Subject: Re: ipfw: getsockopt(IP_FW_ADD): Invalid argument
> To: "Unga" <unga888 at yahoo.com>
> Cc: freebsd-questions at freebsd.org
> Date: Tuesday, July 5, 2011, 5:14 PM
> In freebsd-questions Digest, Vol 370,
> Issue 2, Message: 14
> On Mon, 4 Jul 2011 09:11:07 -0700 (PDT) Unga <unga888 at yahoo.com>
> wrote:
>  > --- On Mon, 7/4/11, Unga <unga888 at yahoo.com>
> wrote:
>  > 
>  > > From: Unga <unga888 at yahoo.com>
>  > > Subject: ipfw: getsockopt(IP_FW_ADD): Invalid
> argument
>  > > To: freebsd-questions at freebsd.org
>  > > Date: Monday, July 4, 2011, 11:48 AM
>  > > Hi all
>  > > 
>  > > Following ipfw rule develop error indicated in
> the subject
>  > > line:
>  > > ipfw add 100 fwd 127.0.0.1,1234 tcp from any to
> any 1234
>  > > out via wlan0
>  > > 
>  > > What I want to do is forward any packet going to
> port 1234
>  > > to 127.0.0.1:1234.
>  > > 
>  > > I have built the kernel with "options     
>  > >    IPFIREWALL_FORWARD".
>  > > 
>  > > What's the error here? Is the rule incorrect?
>  > > 
>  > > This is FreeBSD 8.1.
>  > > 
>  > > Many thanks in advance.
>  > > 
>  > > Unga
>  > > 
>  > 
>  > Does anybody successfully use the "ipfw fwd"? If so
> in which FreeBSD version?
> 
> Not I, but many do.  On the face of it the rule looks
> correct.  Do you 
> have a TCP service running on localhost:1234 ?  Does
> wlan0 exist?  You 
> may do better posting to the freebsd-ipfw list, with more
> information.
> 
> cheers, Ian

Hi Ian

Thanks for the reply.

I do have a daemon listening to the port 1234 on the local machine.

The wlan0 exists and ip number 192.168.1.3 assigned.

I'll write the freebsd-ipfw.

Thank you.

Unga