Re: proxy_arp / pppoe-server / arp cache persistence problem

[Rodolfo Barbosa <barbosa.rodolfo@lunarconsultoria.com.br>]

Wojciech Ziniewicz escreveu:
> 2008/1/29, Wojciech Ziniewicz <wojciech.ziniewicz@gmail.com>:
> > Hello
> > I have pppoe server with about 200-500 clients online - all of them
> > have public IP adresses and I use a "proxyarp" option in my pppoe
> > server what means the same as proxy_arp in /proc/sys/net but only for
> > my pppX interfaces (not for eth0, eth1 etc )
>
>
> [...]
>
> hey - i've found a nice arp setting : net.ipv4.neigh.eth0.base_reachable_time
>
> from man 7 arp :
>
> " Once  a  neighbor  has  been  found,  the  entry  is  considered  to
>  be valid for at least a random value (...)  Defaults to 30 seconds."
>
> My next questions :
>
> - can I adjust it to be "0" - will it mean "infinite" ?
>
> - why there's so short default time of re-sending the arp cache
> refresh for and ip address ?
Ziniewicz,

This time is so short to avoid conflicts between the network hosts` arp 
entries and a new host that joins to network.

If this time becomes longer, when we add an new host on the network 
it`ll be unreachable.

Regards
--
Rodolfo Barbosa
Lunar Consultoria