To get two virtual guests to talk to each other while also being able to reach out to rpm repos etc. (i.e. to inernet), one needs to define two interfaces on the VirtualBox guest OS settings:
- first interface (will be eth0) should use default NAT setting. This will provide Internet access.
- second interface (will be eth1) should use 'Internal Network'. This will provide in-between guests connectivity.
When booting the guest (Centos in my case), eth0 will come up via DHCP, then configure eth1 with a static non routable IP address. However when bringing it up, it will override DNS and default GW as set by eth0, therefore breaking internet access. The fastest path recover is to simply restart eth0 (ifdown eth0/ifup eth0) which gets again the correct settings from the dhcp server.
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