there are strange things:  

on my virtualbox：  

centos7  

Interfaces：

```
enp0s3: 192.168.10.110/24
lo:0 10.0.3.110/24 (ip alias)

```

route：

```
default via 10.0.3.2 dev lo
192.168.10.0/24 dev enp0s3

enp0s3 is plugged in 10.0.3.0/24

```

I have enabled the ip\_forward (net.ipv4.ip\_forward = 1)

---

My Question：

`ping 10.0.3.2` works，but why?

`tcpdump` can't get packets on `enp0s3`，but does get packets on `lo`.

The default route is `lo`; why does `ping 10.0.3.2` work? Why can't I get packets on `enp0s3`?