Some help with broadcasts through a Linux system

[Luke Kenneth Casson Leighton]

On Wed, 3 Feb 1999, Jasper van der Neut wrote:

> Richard Sharpe wrote:
> > 
> > Hi,
> > 
> > I am having problems getting broadcasts through a Linux system.
> > 
> > Here is the config:
> > 
> >      172.30.0.0/24               16.153.112.0/24
> >      ----------------[Linux Box]------------------
> > 
> > I have it set up with ip_forward=1.
> > 
> > However, when I ping 16.153.112.255 from 172.30.0.120, 172.30.0.1 responds,
> > and I see nothing on the 16.153.112.0/24 subnet.
> > 
> > The linux box is running a 2.0.36 kernel.
> > 
> > It seems that Linux feels that it should not have to forward the broadcast
> > datagrams.
> 
> Which is the correct behaviour.

> If you want to forward your netbios datagram broadcasts you have to do
> more than just forwarding because the data contains ip-addresses too.
> 
> I've solved this problem by writing a patch for Samba which 'glues' 
> the subnets of my linux firewall together. You can find the code
> at http://malt-whisky.student.utwente.nl/nbfw/ . The code is not

i would discourage anyone from doing this.  use a WINS server instad.