Enable ssh host to guest and guest internet on CentOS 7 guest using VirtualBox

I have 2 CentOS 7 guests running in VirtualBox on an Ubuntu host.

I would like to be able to:

1. Connect from host to guest using SSH
2. Download/install packages from the Internet on the guest.

I currently have the following two virtual network interfaces

• host only, mapped to "enp0s3" on the guest
• NAT, mapped to "enp0s8" on the guest

My current configuration:

$ cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
NAME=enp0s3
UUID=fcd0aa44-9ab7-42e6-a637-52c429727195
ONBOOT=yes
HWADDR=08:00:27:BE:DB:11
IPADDR=192.168.56.102
PREFIX=32
GATEWAY=192.168.56.1

and

$ cat /etc/sysconfig/network-scripts/ifcfg-enp0s8
HWADDR=08:00:27:A2:03:29
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s8
UUID=09acefe7-d513-48f6-b820-0988ac495e5e
ONBOOT=yes

Current route information:

$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.56.1    0.0.0.0         UG    1024   0        0 enp0s3
10.0.3.0        0.0.0.0         255.255.255.0   U     0      0        0 enp0s8
192.168.56.1    0.0.0.0         255.255.255.255 UH    1024   0        0 enp0s3

At this point, I can SSH from the Ubuntu host to the CentOS guest, but I cannot successfully connect to the Internet:

$ wget https://github.com/antirez/redis/archive/3.0.0-rc6.tar.gz
Resolving github.com (github.com)... 192.30.252.130
Connecting to github.com (github.com)|192.30.252.130|:443...

Many other posts and examples suggested me to remove the default gateway from "enp0s3". If I remove the default gateway from "enp0s3", I cannot SSH to the CentOS guest from the Ubuntu host.

How can I make this work?