ping from host to guest Fedora20 host only network virtualbox

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First of all, make sure you have setup the Firewall host-to-guest network properly. The default scheme is NAT which doesn't allow a host to access the guest directly. It only allows a guest to access the host's internet connection through network address translation. You will have to setup something like Host-only networking setup ( https://www.virtualbox.org/manual/ch06.html#network_hostonly ). This will create a virtual nic (typically vbox0 with an ip-address 10.x.x.1), so that your host is able to ping and ssh the fedora box and both boxes can talk to each other.

On fedora, firewall allows the ssh service by default. But still, you can make sure by opening fedora firewall and making sure that ssh port is open on the public zone (or whatever zone your vbox0 nic falls in).