since my last post, tried this now using vmbr0 on x.x.7.145, running the following:
root@proxmox:~# traceroute 174.142.7.144
traceroute to 174.142.7.144 (174.142.7.144), 30 hops max, 60 byte packets
connect: Permission denied
if i try doing same on x.x.7.151, same thing - my DC is confusing me...