I beleive the key to this is proxy arp.

Brgds, Espen
8. mars 2015 23:50 skrev "Bryan D." <[email protected]>:

> While we're on the topic, I have a functioning v2.2 setup that uses a /29
> set of static IPs:
> - 1 IP is the gateway address and 5 IPs are "usable" (quite common, I
> believe)
> - one of the "usable" IPs is assigned to the WAN interface
> - the other 4 "usable" IPs are assigned to VIPs
> - the WAN IP and VIPs have various port-forward and NAT rules associated
> with them
> - the WAN IP and 2 of the VIPs serve 3 different domains
>   (e.g., web, email, VPN -- servers are behind the firewall on isolated
> LAN)
> - one of the other VIPs is used by mobile VPNs (IPsec and OpenVPN)
>
> All this works nicely ... as long as the VIPs are CARP VIPs.  However,
> since I'm not using any fail-over/redundancy, I don't think I should
> require CARP VIPs (and I suspect that using CARP VIPs is the reason that,
> when the cable modem goes down, I can't get at the pfSense webconfigurator
> until I unplug the WAN cable ... it's OK after I plug it back in, even if
> the cable modem is still down, but it does need to be unplugged???).
>
> My interpretation of the nice chart and notes on
> https://doc.pfsense.org/index.php/What_are_Virtual_IP_Addresses
> leads me to believe that I can switch the CARP VIPs to be IP Alias VIPs.
> However, when I do that, the 2 servers for the 2 domains tied to the VIPs
> are no longer accessible from the Internet (but IIRC, the mobile VPNs still
> work).
>
> Can anyone suggest what it is that I don't understand (well, limited to
> this behavior, at least)?
>
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