Remote host pingable from Mac but not from Virtualbox VM

Arjun

I have a remote that I can ping from the Macbook terminal. However, when I start the VirtualBox Ubuntu 16.04 VM and ping the same remote host, it fails to ping and I get the error "target host unreachable".

Also, when I do this, I'm on the company's VPN, and the remote host is on that network.

I've been trying to find similar issues online but haven't found any. How can I debug this? Please let me know any information you need.

Output from my VM:

$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.0.2.2        0.0.0.0         UG        0 0          0 eth0
0.0.0.0         10.0.0.1        0.0.0.0         UG        0 0          0 enp0s8
10.0.0.0        0.0.0.0         255.255.255.0   U         0 0          0 enp0s8
10.0.2.0        0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
172.17.0.0      0.0.0.0         255.255.0.0     U         0 0          0 docker0
172.18.0.0      0.0.0.0         255.255.0.0     U         0 0          0 br-3703e922f98f

$ nslookup eventquery01.mp.local
Server:     172.16.254.11
Address:    172.16.254.11#53

eventquery01.mp.local   canonical name = mpeventquery01.mp.local.
Name:   mpeventquery01.mp.local
Address: 172.18.83.85

$ ping 172.16.254.11
PING 172.16.254.11 (172.16.254.11) 56(84) bytes of data.
64 bytes from 172.16.254.11: icmp_seq=1 ttl=63 time=74.8 ms
64 bytes from 172.16.254.11: icmp_seq=2 ttl=63 time=76.4 ms
64 bytes from 172.16.254.11: icmp_seq=3 ttl=63 time=78.4 ms

$ ping 172.18.83.85
PING 172.18.83.85 (172.18.83.85) 56(84) bytes of data.
From 172.18.0.1 icmp_seq=1 Destination Host Unreachable
From 172.18.0.1 icmp_seq=2 Destination Host Unreachable
From 172.18.0.1 icmp_seq=3 Destination Host Unreachable
graceful restart

According to your routing, all traffic 172.18.0.0/255.255.0.0to which the IP address belongs 172.18.83.85will be sent to the br-3703e922f98finterface.

If br-3703e922f98fthe interface is not on the same network as the remote host eventquery01.mp.local, and in fact they are two separate networks covering part of the same subnet, the only way to fix the problem is to change the network subnet of one of the endpoints to something the other network is not using.

is br-3703e922f98fthe interface part of a docker network? If so, there are configuration options to modify the networks created by Docker, or you can create them manually.

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