Re: Turning off ARP in linux-2.4.0

[Bernd Eckenfels]

On Thu, Jan 25, 2001 at 01:02:32PM +0200, Julian Anastasov wrote:
> 	Hey, the world is not only Linux. Sometimes the people build
> clusters using different hardware and software. If your solution works
> for your setup we can't claim it is universal.

It is a Linux News Group after all. So dont confuse us with Broken Operating
Systems. And of course we don't need a Hidden flag in Linux to solve other
Operating Systems Auto-Binding.

> 	When you send the IPIP datagram again to real server in the
> LAN you have the same problem.

Yes, you are right, -arp is needed in that system, too. Or you need WAN
Distributed Services.

> 	You can't always use -arp!!! Read above. Fix the manual! BTW
> in this thread I don't see wrong docs. Which ones claim this?

The Manual is OK. It claims that -arp will work and it claims that on some
Linux Sytems it wont (i am not sure why it should not work on old kernels
but i accept it).

> 
> 	-arp can work if you maintain a fresh copy in /etc/ethers and
> when you don't use ARP. But then you don't need to set -arp flag. The
> setup will work without setting -arp to lo or eth, right? If you don't
> use ARP why to stop it in the interface? In theory we will not see any
> ARP packets, even from the uplink router.

I am not sure about this, because of the neighbour alive discovery. I dont
know if a hard wired ARP Address will stop that.

> > it is changing the packets MAC destination address (or using an IPIP tunnel).
> 
> 	Tunnel to where? To real server in the LAN or to another
> real server?

To the real server on the LAN, the server is the endpoint. As written in LVS
Docs.

> 	You are lucky to use Linux on all hosts. May be you have one
> extra uplink router (a Linux box)?

You can turn off arp discovery on every reasonable pwerfull router. And I
dont see a situation where you want to build a HA/HP Cluster using you ISPs
Router as a core component and the ISP is not cooperating with you.

> 
> 	They are not complicated more in 2.4. The current handling in 2.4
> is same. I already said that the net maintainers are planning other
> features for 2.4 and the hidden feature is not considered. Until then
> there is no difference between the kernels and the hidden feature can
> be used even in 2.4.

There is no hidden Feature in 2.4, thats why we have started the thread. And
for exactly this reason I suggested to use -arp.

Greetings
Bernd
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