Typically if you want put 3 ip addresses in the same subnet on a
network usually you use a single network adaptor and add extra VIPs on
it.
see:
https://www.jamescoyle.net/how-to/307-create-a-virtual-ip-address-in-linux
eth0:1 for the device names it the 1st vip, :1 as the 2nd vip and so
on. They all exist on the same adaptor.
with the same network on all 3 what interface it goes out can be
different than the one it came in and this can cause significant
issues on the network.
On Wed, Nov 4, 2020 at 5:32 PM Gordon Messmer <gordon.messmer(a)gmail.com> wrote:
>
>
> On 11/4/20 6:16 AM, Scott van Looy via users wrote:
> > So on startup, all 3 appear to be working and have IPs assigned according to
ifconfig, but...
> >
> > .215 accepts pings, .216 and .217 do not
>
>
>
https://access.redhat.com/solutions/53031
>
> reverse path filtering is on by default, and in that configuration the
> system will only accept incoming traffic if a reply would go out the
> same interface.
>
> You can disable rp_filter to accept incoming traffic on multiple
> interfaces, but that's not necessarily a good idea. If you're trying to
> increase bandwidth to the system, for example, this configuration won't
> do that. All of your outbound traffic is still going to go out one
> interface.
>
> We can probably give you a better solution if you can describe why you'd
> have multiple interfaces with different addresses on the same network
> segment.
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