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

From: Rodolfo Barbosa <barbosa.rodolfo(at)lunarconsultoria.com.br>
Date: Tue Jan 29 2008 - 17:40:15 EST

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


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Received on Tue Jan 29 17:41:04 2008

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