a well-known bug in 6.1 was, that the installer would not write the /etc/hosts and the /etc/resolv.conf with the entries supplied from the "network" part of the install info. The 7.0rc1 installer does even worse: after the install, the hosts file contains only 1 line, e.g. 127.0.0.1 ls3034 localhost.localdomain localhost and the resolv.conf contains only the "nameserver ..." -line.
Reassigning to the installer.
We haven't figured out a solution that pleases more then 50% of the people (including roaming laptop users) yet :-(
*** Bug 17492 has been marked as a duplicate of this bug. ***
*** Bug 14857 has been marked as a duplicate of this bug. ***
*** Bug 14501 has been marked as a duplicate of this bug. ***
*** Bug 13486 has been marked as a duplicate of this bug. ***
*** Bug 17769 has been marked as a duplicate of this bug. ***
This behavior isn't going to change at present since it seems to be correct the most often of any solution.