Possible CARP routing issue

[jd1008]

On 11/25/2014 10:46 PM, Riaan Kruger wrote:
> It seems that in some circumstances routing is not playing well with CARP.
> We have the following scenario.
>
> Device A
> ---------
> 192.168.1.10
>
> Router:
> -------
> 10.0.0.1
>
> Device B
> --------
> Interface 1 Virtual IP (CARP): 172.16.1.3
> Interface 1 Real IP: 172.16.1.2
>
> Routing table of device B:
> 0.0.0.0        10.0.0.1
> 192.168.1.0    10.0.0.1
> etc ...
>
> When Device A pings the Real IP of Device B (172.16.1.2) we see the
> following ARP request packet:
> ARP request who has 192.168.1.10 tell 172.16.1.3
>
> In other words pinging the real IP causes the Virtual IP to ask for the MAC
> address of the pinging device, even though they are not in the same subnet
> and there is a default route. Pinging the virtual IP does not induce this
> ARP request and the ping is successful.
> When deleting the second route from the routing table above the ARP request
> is not sent.
> I know the second route is superfluous but it is put there by third party
> software.
>
> The real issue is why this behavior happens with CARP. Is it an indication
> of some underlying problem?
>
>
> Riaan
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