Routing problem from local interface

Hi,

I have a virtual UTM running on a ESXi server, two intefaces:

- ETH0, with a public IP 
- ETH1, with a local subnet 172.168.15.1

My problem is that I can't reach/ping anything on the WAN when I ping over the private interface (172.168.15.1):

PING 8.8.8.8 (8.8.8.8) from 172.168.15.1 eth1: 56(84) bytes of data.

From 172.168.15.1: icmp_seq=1 Destination Host Unreachable

From 172.168.15.1 icmp_seq=1 Destination Host Unreachable

From 172.168.15.1 icmp_seq=2 Destination Host Unreachable

I have another Vmware guest in the private subnet with IP 172.168.15.100 with 172.168.15.1 (the private ip of the UTM) from where I can succesfully route out.
I have set a Masquerading rule for that (Network: internal / Interface: public).

But I have no routing directly from 172.168.15.1.

This is my routes table:

default via 213.239.207.193 dev eth0  table 200  proto kernel onlink
default via 213.239.207.193 dev eth0  table default  proto kernel  metric 20 onlink
10.0.0.0/16 dev eth0  proto ipsec  scope link  src 172.168.15.1
10.242.2.0/24 dev tun0  proto kernel  scope link  src 10.242.2.1
127.0.0.0/8 dev lo  scope link
172.168.15.0/24 dev eth1  proto kernel  scope link  src 172.168.15.1
213.239.207.192/27 dev eth0  proto kernel  scope link  src 213.239.207.100
broadcast 10.242.2.0 dev tun0  table local  proto kernel  scope link  src 10.242.2.1
local 10.242.2.1 dev tun0  table local  proto kernel  scope host  src 10.242.2.1
broadcast 10.242.2.255 dev tun0  table local  proto kernel  scope link  src 10.242.2.1
broadcast 127.0.0.0 dev lo  table local  proto kernel  scope link  src 127.0.0.1
local 127.0.0.0/8 dev lo  table local  proto kernel  scope host  src 127.0.0.1
local 127.0.0.1 dev lo  table local  proto kernel  scope host  src 127.0.0.1
broadcast 127.255.255.255 dev lo  table local  proto kernel  scope link  src 127.0.0.1
broadcast 172.168.15.0 dev eth1  table local  proto kernel  scope link  src 172.168.15.1
local 172.168.15.1 dev eth1  table local  proto kernel  scope host  src 172.168.15.1
broadcast 172.168.15.255 dev eth1  table local  proto kernel  scope link  src 172.168.15.1
broadcast 213.239.207.192 dev eth0  table local  proto kernel  scope link  src 213.239.207.100
local 213.239.207.100 dev eth0  table local  proto kernel  scope host  src 213.239.207.100
broadcast 213.239.207.223 dev eth0  table local  proto kernel  scope link  src 213.239.207.100
unreachable default dev lo  table unspec  proto kernel  metric 4294967295  error -101
unreachable default dev lo  table unspec  proto kernel  metric 4294967295  error -101
unreachable default dev lo  table unspec  proto kernel  metric 4294967295  error -101
local ::1 dev lo  table local  proto unspec  metric 0
unreachable default dev lo  table unspec  proto kernel  metric 4294967295  error -101

What am I missing?