New failure detection algorithm for ng_one2many(4).

[Evgeny Dolgopiat]

> Hello.
> 
> Patch below adds new failure detection algorithm for ng_one2many(4).
> For now, the only such algorithm doesn't detect failures, one have
> to show active links manually.
>
>        http://garage.freebsd.pl/patches/netgraph_one2many.patch
>
> The way how to use this module (ng_one2many) is described in manual
> page, to made use of new algorithm one should execute:
>
>        ngctl msg fxp0:upper setconfig "{ xmitAlg=3D1 failAlg=3D2
>interval=3D5 }"
>
> Value '5' after interval means: check interfaces every 5 seconds.
>If interface will be down it will not be used.
>
>Note that 'one' interface have to be always avaliable.
>
>Any comments, etc. are of course welcome

Hello. Did you see my patch?

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=92946+0+archive/2005/freebsd-net/20050116.freebsd-net

Heartbeat signal has some advantages as compared to ioctl function. All subnet 
containing failed element (card or hub) marked as failed.  Therefore packets 
sended from other hosts to host, holding failed element, wouldn't lost. Other 
advantage:  now heartbeat algorithm working independently of the layer on 
which one2many operates (not only for ethernet).

Some time ago (october 2003) I sent first version of this patch in mailing 
list  and got some replies from people,  using STABLE (4.X). But this patch 
could be used only for 5.X, not stable at that time. Now 5.3 is stable and 
this patch can be used for it.