Re: Why does arp on 2.2.5 return "SIOCSARP: Operation not supported by device"?

Miquel van Smoorenburg (miquels@cistron.nl)
14 Apr 1999 11:18:37 +0200

In article <cistron.199904140838.KAA00667@cave.BitWizard.nl>,
Rogier Wolff <R.E.Wolff@BitWizard.nl> wrote:
> "inside" "outside"
> ______________
> about 100 | |
> computers total | linux |
> -------------------------| router | about 2000
> | | computers +
> | | the default
> -------------------------| | gateway.
> | |----------------
> | |
> -------------------------| |
> | |
> | |
> -------------------------| |
> | |
> |______________|

In this case, Linux 2.2.x will do the right thing. It WILL do proxy
arp for the whole network it's just that you don't have to configure it.

If a computer on the left tries to reach the default gateway using
ARP, the Linux machine will realize "hey, someone is ARPing for an
address fow which I am the/a gateway. Let's respond".

Cisco routers exhibit the same behaviour by default.

Now it might be that this doesn't work - in that case you have found a bug.

Mike.

-- 
Indifference will certainly be the downfall of mankind, but who cares?


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