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AWS image: Weird /etc/network/interfaces


I created an instance from this image:

debian-jessie-amd64-hvm-2015-06-07-12-27-ebs - ami-02b78e1f

and the /etc/network/interfaces file was like this:

source-directory /etc/network/interfaces.d
auto eth0
iface eth0 inet dhcp
iface eth1 inet dhcp
iface eth2 inet dhcp
iface eth3 inet dhcp
iface eth4 inet dhcp
iface eth5 inet dhcp
iface eth6 inet dhcp
iface eth7 inet dhcp

The extra eth* are probably harmless, but the lack of "lo" seems not
to be: The command "nmap localhost" takes forever to complete.

If I add

auto lo
iface lo inet loopback

then nmap takes the usual time to scan localhost (two seconds).


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