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Ubuntu /etc/hosts

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When no internet connection my vhost apache can't not access.
I found that there were no record for this 127.0.0.1 test.local.dev in  /etc/hosts

When I added this record, without Internet conn it work.
From virtual machine (like Virtualbox) it still work because it has different hosts name DNS file.

Why when in connection on Internet, Ubuntu do not need /etc/hosts to domain name translate.

Update 1: 2016/07/06
Firefox trên Ubuntu 14.04 bỏ qua file /etc/hosts.
Muốn chạy các site local thì cần vô DNS của FF chình về 127.0.0.1.
Chi tiết coi tại https://support.mozilla.org/en-US/questions/1011327
và http://stackoverflow.com/questions/6184808/firefox-work-offline-with-virtual-host
Khi chỉnh như vậy thì ko vô internet được, chỉ trong localhost vhost domain.
Ai có cách chỉnh thì xin hướng dẫn.

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