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

[Andreas Tønnesen]

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.


- Andreas

Jens Nachtigall wrote:
> Hi,
> 
> a general problem is the announcement of HNA4 gateways, when there is 
> none (due to your ISP, or misconfiguration). I thought of handling this 
> by periodically pinging certain well known public IPs using a cron job. 
> If the IPs are not pingable, then I want to dynamically tell olsrd that 
> the HNA4 is not valid. I could obviously do so, by stopping and 
> restarting olsrd. However, this adds further (CPU) overhead, I guess.
> 
> Is it possible to tell a running olsrd about a changed HNA4?
> Maybe using a HUP signal causing olsrd to reread its config (though this 
> would mean to change the config on the fly; very ugly)?
> 
> Or am I best off simply restarting olsrd?
> 
> The best (for users ;-) IMHO would be if this could be implemented in 
> olsrd itself. This is such a common error, that one would have to 
> actually bundle olsrd with this cron job if seriously building a 
> network is your aim, which makes distribution difficult for a 
> heterogenous network (linux, windows, soon mac and bsd). I would prefer 
> if the config allowed entering certain HNA4_IPs belonging to a HNA4. If 
> this HNA4 is set in the config and certain HNA4_IPS exists from this 
> HNA4 net then every HNA4_CHECK_AVAIVABILITY_TIME sec olsrd tries 
> pinging these, and adjusts its HNA4 messages accordingly, e.g.:
> 
> HNA4 netaddr netmask [pingable IPs] [time in sec]
> 
>  This is vaguely how the MITRoofNet did it.
> 
> Best,
> Jens
> 
> 
> 
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-- 
Andreas Tønnesen
http://www.olsr.org