where is the firewall?

[David Curtis]

On Wed, 16 Sep 2009 20:52:53 +0200
robert rottermann <robert at redcor.ch> wrote:

> Hi there,
> 
> I inherited the support of a upuntu server.
> 
> lsb_release -a shows
> No LSB modules are available.
> Distributor ID: Ubuntu
> Description:    Ubuntu 6.06.1 LTS
> Release:        6.06
> Codename:       dapper
> 
> 
> it seems to be a rather old version (it has an uptime of some
> years ..)

If it's the server version, I believe you're going to get security
updates until some time in 2011. Check the Ubuntu site for
the maintenance schedule. Desktop is EOL.
  
> now I have never been dealing with ubuntu or an other debian based
> system, so I migth ask some dumb question..
> 
> first: where is the firewall, how do I configure it?
> 
> iptables -L shows nothing.

Yup, that's it. Iptables is the linux equiv to *bsd's packet filter
(pf). And if -L shows nothing (sudo iptables -L ??) then I would agree
there are no rules specified.

> 
> if there is (as I am afraid) no firewall, how is the access from the
> internet block (the box is is used as a webserver).

No other network hardware in between internet and server already doing
this?

If not, here are many ways to configure iptables, many scripts abound on
the internet, and of course you can create your own. I personally use
arno-iptables-firewall, which is fairly comprehensive, and in the
repositories (archives). It's activated on boot (init/upstart) and can
be configured with debconf. But it may be a quite old version in 6.06.
Many people on this list have their own favourites, which I suspect
they will shortly tell you about. :)

Dave