[openbeosnetteam] Re: PPP: dial-on-demand
- From: "Waldemar Kornewald" <Waldemar.Kornewald@xxxxxx>
- To: <openbeosnetteam@xxxxxxxxxxxxx>
- Date: Thu, 3 Jul 2003 10:15:24 +0200
> > Hi,
> > before I implement something that would never work with our stack, could
> you
> > please help me with some (basic?) BSD stuff?
> > I plan to implement dial-on-demand the following way:
> > When an interface registers itself to the ppp_interface_manager it gets
an
> > ifnet structure assigned.
> > The if_flags are set to IFF_UP | IFF_POINTTOPOINT.
> > This happens will all interfaces regardless whether dial-on-demand is
set
> or
> > not.
> > The following is only done with dial-on-demand interfaces:
> >
> > 1) The IP Control Protocol adds itself as the default route and uses an
> > undefined class A dst address (?10.0.0.1 + if_unit?) and an undefined
> class
> > A interface address (?10.127.0.1 + if_unit?). BTW, do we have a function
> > that returns the netmask of some ip-address?
> > AFAIK, calling SIOCSIFDSTADDR also sets the default route automatically
> and
> > it has a special handling for IFF_POINTTOPOINT. Does it check if the
> return
> > value of the interface is ok and add the route only then?
> > Which ioctl should bring the interface up? SIOCSIFFLAGS or SIOCSIFADDR
or
> > both?
> > How do I prevent changing the interface's ip?
> > Do I have to add an ifaddr for each protocol?
> >
> > 2) When the interface must send some data it Up()s itself. Up() adds
> > IFF_RUNNING to if_flags if it was successful.
> > All threads that try to send something are blocked and wait until Up()
is
> > done. If Up() fails they delete the mbuf and return an error.
> > Also, when the IP Control Protocol is brought up it
> > SIOCSIFDSTADDRs+SIOCSIFADDRs the received ip addresses.
> >
> > 3) A Down() (or whatever might cause it) will bring us back to 1)
> >
> > Do you think this will work?
>
> Do what you want. ;)
>
> Seriously, was this a too stupid question?
> Am I too stupid?
> Someone put the code together, so he/she should know if this is right or
> wrong.
> Where is this person and why does this person refuse to help me?
> Am I not worth being helped? :))
For those who did not understand:
This is just a joke (see the smileys). ;)
Waldemar
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