The whole point of having these guest machines is for testing communications, putting an IP address on them so you can ping things, is a pretty basic step.
Solution
1. Console in, and execute the following commands, obviously change the IP addresses to the ones you require.
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sudo su
ifconfig eth0 10.10.10.10 netmask 255.0.0.0 up
route add ip default gw 10.10.10.1
route add default gw 10.10.10.1
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