[ClusterLabs] Making xt_cluster IP load-sharing work with IPv6 (Was: Concept of a Shared ipaddress/resource for generic applicatons)[

[Andrei Borzenkov]

04.01.2020 01:42, Valentin Vidić пишет:
> On Thu, Jan 02, 2020 at 09:52:09PM +0100, Jan Pokorný wrote:
>> What you've used appears to be akin to what this chunk of manpage
>> suggests (amongst others):
>> https://git.netfilter.org/iptables/tree/extensions/libxt_cluster.man
>>
>> which is (yet another) indicator to me that xt_cluster extension
>> doesn't carry that functionality on its own (like CLUSTERIP target
>> did, as mentioned).
> 
...
> 
>> * But it doesn't explain the suggested destination MAC renormalization
>> * on INPUT, which is currently yet to be heard of for our purpose...
> 
> I did not use the INPUT rules from the xt_cluster documentation and
> to be honest don't understand the setup described there.
> 

ARP RFC says that on reply source and target hardware addresses are
swapped, so reply is supposed to carry original source MAC as target
MAC. AFAICT Linux ARP driver does not check it, but I guess it is good
practice to make sure received packet conforms to standard's requirement.