cups relaying remote broadcasts to a local subnet

[Thomas Taylor]

On Tuesday 23 May 2006 19:42, Gregory P. Ennis wrote:
> On Tue, 2006-05-23 at 17:10 -0700, Thomas Taylor wrote:
> > On Tuesday 23 May 2006 08:22, Gregory P. Ennis wrote:
> > > Everyone,
> > >
> > > I posted a request last week that I am still not able to solve.  I am
> > > unable to broadcast cups remote printer information to a local subnet
> > > that is different than the external network card.
> > >
> > > In looking at the cups examples I have not seen any example of this
> > > capability so I am wondering if anyone else has made this work or is
> > > this a design limit of cups.
> > >
> > > Here is the example ip address obviously have been changed
> > >
> > > "Remote A" 70.69.68.67     <->     "Remote C" 64.35.30.18
> > >
> > > "Remote B" 64.70.99.20     <->     "Remote C" 64,35,30,18
> > >
> > >
> > > Remote A is a two ethernet card gateway to a local network
> > > Remote B is a one ethernet card gateway to a local network
> > > Remote C is a two ethernet card gateway to a local network
> >
> > Why are there two ethernet cards on A and C but only one on B?
> > If B is the portal to the internet, how does it connect to the router?
> > Doesn't it use an ethernet card for that?  If so, how does it connect to
> > Remote C?  That would also need an ethernet card
> >
> > How does Remote A connect to the internet, does it route through Remote C
> > to Remote B or is it not supposed to?
> >
> > > Remote B has only one card because it is attached to an isp's router
> > > that has NAT translation to a local subnet of 10.0.0.0
> > >
> > > I am able to get broadcasted printer information into the local network
> > > of Remote  B, but not Remote A or Remote C.  The difference obviously
> > > being the fact that A and C have an internal and external ethernet
> > > cards.
> >
> > And how are those cards setup?  Internal & external subnets to what?
> >
> > > When I look at the examples on the cups documentation or ESP
> > > documentation I have not found any examples of a two network card
> > > machine broadcasting to an internal subnet different than the external
> > > subnet.  There are examples of broadcasting to an internal subnet that
> > > has the same subnet as the external card.
> > >
> > > I would like to know if any of you have been able to make cups
> > > broadcast remote printer information to an external ethernet card and
> > > then through the internal ethernet card using a different subnet for a
> > > local network. If this is possible I would sure like some help.
> > >
> > > Thanks,
> > >
> > > Greg Ennis
> >
> > Please provide more information, thanks.
> >
> > --
> > Tom Taylor
> > Linux user #263467
> > Federal Way, WA
>
> Tom,
>
> Thanks for your help.  Sorry my explanation was lame.
>
> Each of these Remote A, Remote B, and Remote C are separate networks in
> different and remote locations.
>
> B only has one ethernet card because the ISP has a router with nat
> translation directed to its ethernet card.  ie the IP address of B is
> 10.0.0.x internally and the router translates the external 64.70.99.20
> to 10.0.0.x.
>
> Remote A and Remote C have two internet cards each.  One card is
> connected to the internet and the other card is connected to the local
> lan at each site.  With A and C all traffic is required to go through
> them to reach the internet.  With B I route all traffic through it, but
> the traffic is not required to go through it.
>
> Each of these networks has a different isp, and their own gateway ie (A,
> B, and C).  I am getting ready to change isp on B and when that happens
> it will become a two ethernet card machine as well but before I switch I
> would like to be able to get cups to work behind a two ethernet card
> system.
>
> I use a subnet on the local network behind A, B, and C of 10.0.0.*.
>
> In essence I can easily get cups to work on a subnet behind a gateway
> that functions with the same subnet (B), but I can not get cups to work
> on a subnet on the inside of a gateway that has an external ip on a
> different subnet than the interal lan (A and C).
>
> Sure appreciate your help!!!
>
> Greg

This sounds like an application that could use a vpn (virtual private network) 
over the internet.  I haven't done this yet but have seen it used at one 
company.  You should be able to get information from the LPD howto's on vpn 
or try googling for vpn.

HTH,
Tom

-- 
Tom Taylor
Linux user #263467
Federal Way, WA