Hello Frank > As I understand it, a firewall prevents computers from communicating > undesirable communications. Poorly worded, perhaps, but I am sure it > addresses the intent of firewalls. This is partly true, the decision to "accept a communication" depends at a firewall on source/dest (ip) , Protocol ( tcp etc) and port This is ofcourse a simplification. But the package filter that is build in leaf doesn't look at the content of a message. (so if a webserver is allowed to pass, it passes indepent if this is a scientifc information or a advertisement for uh cars.) Content filtering is done by other programs, (f.e. junkbuster,squid etc).
> I get lots of undesireable communications on my telephone. There seems > to be a marketing industry devoted to using my phone number as a sales > tool. I am sure everyone on the reflector can identify with this > plague. Now to your telephone, If you want to block certain protocols (fax f.e) this is built in most telephones. if you want to block connections depending on their origin ( src telephonenumber ) this can be done only if the src-telnr is transmitted. In different countries this is done. In Germany this is done on a voluntary base, so as soon as somebody wants to stay unrecognized he will block this feature. In that case you could "blacklist" notorious callers or reject all but a selected group of numbers. Programms like that are build in in almost any mobile telephone and home telephone switch. To filter on the content is almost impossible It takes for you, with a higher intelligence as your computer, even some time to detect that the message the caller is telling you is not interesting for you. To build a speach recognition and interpretation is far beyond a lrp box ;) > Getting to the point, has anyone every considered building a firewall to > prevent this abuse? A telephone firewall. Could something of this > nature be implemented on an LRP box? A rethorical question because I > know it can be implemented. I would do that but don't know how. My lack > of knowledge extends to the programming. I am pretty sure I can handle > the hardware requirements. What can be done in my opinion is filtering for special numbers or only allowing authorized callers, for example with a "telephone login" After connecting to a box, they hear a message please enter your telephone code. If they have that wrong, the connection is broken But that would prevent any person with honest intention to contact you. A simpler method is useing the display with the telephon number and your decision to take the phone. But all that demands that the calling number is transmitted, which isn't always true. > The question is, does anyone know of any efforts to do this? no > > My Dachstein firewall is on all the time, connected to my cable modem. > It could just as well be handling telephone traffic on the same 24/7/365 > basis. And for a lot of other interesting applications, secureing your home printserver makeing coffe ; ) but remember lots of applications means drilling holes in your firewall. Anyhow, I like thought experiments :) Regard Eric Wolzak member of the bering crew ------------------------------------------------------- This SF.net email is sponsored by: Etnus, makers of TotalView, The debugger for complex code. Debugging C/C++ programs can leave you feeling lost and disoriented. TotalView can help you find your way. Available on major UNIX and Linux platforms. Try it free. www.etnus.com ------------------------------------------------------------------------ leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
