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For a test I need to allow routing from my local network to a guest inside a VirtualBox.
The guest already have outside access.

So far I enabled ip forwarding on my local machine (OSX 10.9) and added a route to the host-only network on the machine on the local network.

route add -net 192.168.59.0 netmask 255.255.255.0 gw 192.168.0.107

sysctl -w net.ipv4.ip_forward=1

The network look like that.

Local network 192.168.0.104 -> [Wireless 192.168.0.0/24] -> MacOSX 192.168.0.107 (Wifi) & 192.168.59.3 (VboxHost) -> [VBox 192.168.59/24] -> 192.168.59.103

Unless VirtualBox is purposely dropping packet from the outside this should work.

My goal would be for 192.168.0.104 to connect to 192.168.59.103. So far I can only ping 192.168.59.3 from it.

Also, my guest already have another adapter with a default gw that allow access to the wifi.

What route or network config could I be missing?

Also I could understand the packet getting the my guest, but the guest not being able to reply, however tcpdump show no paquet ever get to guest if say I ping the machine. Also no firewall is running anywhere.

Routing table on my Mac

Destination        Gateway            Flags        Refs      Use   Netif Expire

default            192.168.0.1        UGSc           42        1     en0

127                127.0.0.1          UCS             0        0     lo0

127.0.0.1          127.0.0.1          UH              6  2943735     lo0

169.254            link#4             UCS             0        0     en0

192.168.0          link#4             UCS             3        0     en0

192.168.0.1        9c:d6:43:c8:cf:e8  UHLWIir        43    21647     en0   1199

192.168.0.104      8:0:27:c2:fc:68    UHLWI           0        7     en0   1068

192.168.0.106      0:15:99:77:73:ed   UHLWI           0       82     en0    845

192.168.0.107      127.0.0.1          UHS             2     9114     lo0

192.168.59         link#9             UC              3        0 vboxnet

192.168.59.3       a:0:27:0:0:0       UHLWI           0    69759     lo0

192.168.59.103     link#9             UHRLWIi         2    31866 vboxnet     1

Host-only networking mode cannot be used to route traffic from the local network to the VM hosts. You should use use Bridged, NAT or NAT network. With the last two you need a port-forward.

References:

[1] https://www.virtualbox.org/manual/ch06.html#networkingmodes (See the table at the end of section 6.2)
[2] https://www.virtualbox.org/manual/ch06.html#network_hostonly