[CentOS] VirtualBox on CentOS 7 with bridged network not working

I've installed VirtualBox v5.2 on a CentOS 7.4 machine, but VMs set up with bridged networking can not 'see' past the VirtualBox host machine

i.e. the VM can ping the host and vice versa, but the VM can not ping anything else and other machines on the same subnet can't ping the VM

There are no firewall rules configured on the 7.4 host and selinux is disabled

I have a similar set up on a CentOS 6.9 host, where everything works as expected

Googling doesn't show up any similar issues, so I guess I'm missing something on the host machine

Does anyone have any idea what could be the issue?

Thanks

James Pearson