Thanks for the long and instructive tutorial, Bernd!
>> I thought that proxy arp and gratuitous arp were the same! What's the
>> difference?
Bernd> Proxy ARP means: Answer ARP requests for IP Addresses which are not
Bernd> local to you. For example a PPP Server will answer for ARP requsts for
Bernd> one of its clients. This means all servers in a network whith a dial-in
Bernd> server can talk to the PPP clients without knowing, that they are
Bernd> "behind" the PPP router.
Bernd> Gratious ARP means: request you own address just to inform all hosts on
Bernd> the same wire about your new/changed address.
OK, I understand that the applications are different, but the resulting arp
packet is the same, right? Basically, a host tells everyone on it's LAN to
send packets destined for a particular IP address to it's MAC address.
>> This I don't understand... Is this something I must configure or
>> program? What is the reason for the 1sec delay?
You mentioned something about answering SYNs. What was that about?
Bernd> Well, its a bad idea. I think you defintelly want to look at the fake
Bernd> package for linux. You can find all mentioned tools on the freefire tools
Bernd> and ressources page: http://sites.inka.de/lina/freefire-l/index.en.html
I actually started on this journey after reading the source for
failoverd. Failoverd uses the "arp" command, but doesn't work for
2.2.5 even with new net-tools.
Today I checked out fake. The way they do it is with a userland
program called "send_arp." This seems to be working on 2.2.5!
I am considering using "ifconfig -arp" to disable arp from the online
server host, so that if/when it goes down, the failover host can do
gratuitous arp. Are there any pitfals in doing this?
Can I turn arp off for just the eth0:1 alias, and leave it on for the
eth0 device?
Thanks again for the help Bernd,
Dave
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