[lvs-users] netmask for vip?

linbo liao llbgurs at gmail.com
Mon Jun 26 14:41:47 BST 2017


Thanks Julian.

2017-06-25 1:30 GMT+08:00 Julian Anastasov <ja at ssi.bg>:

>
>         Hello,
>
> On Sat, 24 Jun 2017, linbo liao wrote:
>
> > I search the net, all VIP will be removed if primary IP deleted when
> > promote_secondaries is 0.
>
>         Yes - if we add VIP/24 on eth0. Not - if VIP is added as /32.
>
> > Why VIP should not be promoted as primary IP if DIP removed? I try to
> > search in google, but no luck.
>
>         Nobody should need such games in IPVS setups...
> I just wanted to note all considerations when deciding
> where to add VIP.
>
> > > add DIP/24 on eth0 before configuring VIP. Such DIP is
> > > mandatory for TUN mode because we originate IPIP packets
> > > from DIP.
>
>         If VIP becomes the primary source address when sending
> to TUN real server, the real server can drop the IPIP packet
> with saddr=VIP,daddr=RIP because VIP can be added as local
> address on "lo". Also, there is no guarantee that such
> packet can be routed to the RIP in all cases, sometimes
> saddr=VIP can be allowed to use only the incoming ISP link.
> So, as you see, it depends on many things.
>
> Regards
>
> --
> Julian Anastasov <ja at ssi.bg>
>


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