[OLSR-users] dis/enabling HNA4 while olsrd is running

[Jens Nachtigall]

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> >> This would be a typical plug-in scenario. Actually there is
> >> already a plugin(dyn_gw) that adds and removed Internet HNA4
> >> announcments dynamically based on the existence of a default
> >> route(with metric 0). You should check it out.
> >
> > Thanks for the pointer. However, this does not do what I actually
> > want,
>
> Well - I realize that ;-) but it is very close. You could just
> replace the check of the internal routes(check for Internet route)
> with a ping test.

I see now :-). Actually, I like your approach better, i.e. automatically 
adding gateways (same as file sharing apps which automatically search 
for files to share --> good for the net). If a user is in doubt, it is 
more likely that she/he is willing to share bandwidth if it's done 
automatically.

I've created an (ugly ;-) patch that does more or less what I want (see 
attachment). The remaining question would be:
a) how to generalize the dyn_gw for other subnets (how to make sure that 
these are not behind a NAT), e.g. routers having a route to 
192.168.2.0/24 and having a NAT for this

>
> Then again - there is the question of wether or not pinging hosts are
> the way to go about this(firewalls, external host goes down ect.).
> But I'm not going to debate that - it is definetly one easy and quick
> way of doing this :-)

Yes, I cannot think of anything better ----> suggestions by others 
welcome.

> As for passing an IP to the plugin(to ping), this kind of
> functionallity will probably be available for 0.4.8. There are a LOT
> of changes scheduled for the next release and one of them will
> hopefully be the abillity to pass parameters to plugins from the
> config file.

My idea would be to let the users configure the IPs which should be 
pingable in a certain subnet. If none a given, at least for the 
internet gateway suitable default IPs could be taken. If ping should 
really be done, could be an config option as well.

Kind regards,

Jens
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