VirtualBox: Additional network interfaces configured in /etc/network/interfaces, but can't connect to internet

Anton

Following this link , I used VirtualBox to configure 2 network interfaces for Debian 9 Guest.

  1. A host-only adapter without DHCP that gives the VM a static IP address.

    In a /etc/network/interfacesconfiguration like this:

    auto enp0s3 
iface enp0s3 inet static
address: 192.168.57.5
network: 192.168.57.0
netmask: 255.255.255.0
gateway: 192.168.57.1

    I can SSH into the VM from the host using that IP address. The interface seems to work as expected.

  2. NAT adapter

    In a /etc/network/interfacesconfiguration like this:

    auto enp0s8
iface enp0s8 inet dhcp

    I want to be able to access the internet from the host using that interface. It doesn't work.

this is the outputip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:64:4a:3b brd ff:ff:ff:ff:ff:ff
    inet 192.168.57.5/24 brd 192.168.57.255 scope global enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe64:4a3b/64 scope link 
       valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:41:71:e2 brd ff:ff:ff:ff:ff:ff
    inet 10.0.3.15/24 brd 10.0.3.255 scope global enp0s8
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe41:71e2/64 scope link 
       valid_lft forever preferred_lft forever
Yakim

You have a problem with two gateways. Remove gateway from enp0s3

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