If you are having trouble being able to view the Submitty webpage after a vagrant up you might need to modify the interfaces in your VM. To fix this:

As root modify /etc/network/interfaces and add:

# The host-only network interface
auto eth1
iface eth1 inet static
address 192.168.56.101
netmask 255.255.255.0
network 192.168.56.0
broadcast 192.168.56.255

References and useful links: https://gist.github.com/pjdietz/5768124 and http://christophermaier.name/2010/09/01/host-only-networking-with-virtualbox/