Hi Damien,
I would expect the VIPs to fail, as the default rotue on eth3 will no longer be active. Thus, traffic from internet to VIP will be classified as 'spoof'.
But, not sure why the debug catches the route to e4 instead of LAN route. Is the destiantion on the route actually the 10..zzz.zzz.zzz (internal server) IP or the actual VIP IP? Trying to understand if VIP is being triggered in the first place.