[openbeosnetteam] Re: PPP: dial-on-demand
- From: "Waldemar Kornewald" <Waldemar.Kornewald@xxxxxx>
- To: <openbeosnetteam@xxxxxxxxxxxxx>
- Date: Thu, 3 Jul 2003 09:55:26 +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? :))
Waldemar
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