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Thanks Julian, I understand /32 for "lo" interface.
But my question is VIP for director, it usually configure in other
interface than "lo" , what's the difference between /32 and actual subnet
of the VIP.
In keepalived, if no netmask provide, vip will configure with /32 netmask,
for example:
virtual_ipaddress {
192.168.0.111 ; it will use /32 netmask
192.168.0.112/24 ; it will use /24 netmask
}
Thanks,
Linbo
2017-06-22 5:10 GMT+08:00 Julian Anastasov <ja@xxxxxx>:
>
> Hello,
>
> On Sun, 18 Jun 2017, linbo liao wrote:
>
> > If vip 192.168.0.111 from subnet 192.168.0.0/24, and no netmask support
> in
> > configuration, the default netmask is 255.255.255.255. I test default
> > netmask, looks everything works fine.
> >
> > So what's the proper netmask for vip, 255.255.255.255 or 255.255.255.0?
>
> The "lo" interface is special in Linux, if you
> add IP/24 on lo, what is added actually is a range of local
> addresses, i.e. 256 local addresses in the case for /24.
> As result, for the 127.0.0.1/8 case, we actually have
> 16,777,216 local addresses, i.e. you can use 127.0.0.1 but
> also 127.0.0.2 ... 127.255.255.255.
>
> In the common case with IPVS, we add single VIP, so
> only 255.255.255.255 should be used. And I don't think
> 255.255.255.255 is a default mask, it should be specified in
> all commands.
>
> Regards
>
> --
> Julian Anastasov <ja@xxxxxx>
>
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