Multiple NIC, no ping

Ubuntu server 16.04, fresh install on x64. Here the topology:

internet router ( ---- enp0s7 ( host ( ----- enp1s8 (

Internet works ok but I can’t ping, only arp ping.

/etc/network/interfaces (note the comments):

The primary network interfaceauto enp0s7

iface enp0s7 inet static address netmask network broadcast gateway dns-nameservers

#The GRAF net network interface auto enp1s8 iface enp1s8 inet static address netmask network broadcast #gateway #metric 400 #up route add -net dev enp1s8

results from route -n:

Destination Gateway Genmask Flags Metric Ref Use Iface UG 0 0 0 enp0s7 U 0 0 0 enp1s8 U 0 0 0 enp0s7

results from arp-scan on enp1s8 interface:

Interface: enp1s8, datalink type: EN10MB (Ethernet) Starting arp-scan 1.8.1 with 256 hosts ( 00:0c:42:fa:05:e2 1 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.8.1: 256 hosts scanned in 1.453 seconds (176.19 hosts/sec). 1 responded

I think doesn’t matter but ipforward is YES.

Why I can’t reach on level 3 host What I’m doing wrong? I think for what I know and what I read on the web this is the right configuration…doesn’t work also uncommenting “up route add -net dev enp1s8”


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These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others. is a local only subnet so you won’t be able to ping out or in to it.

Only other hosts on the same subnet would be able to ping each other. That is why you are having the issue.