My system has two NICs as below:
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# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255
inet6 fe80::a00:27ff:fe79:3b43 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:79:3b:43 txqueuelen 1000 (Ethernet)
RX packets 783 bytes 60408 (58.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 514 bytes 62950 (61.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.2 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::a00:27ff:fee6:c57c prefixlen 64 scopeid 0x20<link>
ether 08:00:27:e6:c5:7c txqueuelen 1000 (Ethernet)
RX packets 136 bytes 14117 (13.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 777 bytes 49490 (48.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 696 bytes 66020 (64.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 696 bytes 66020 (64.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.0.2.15 0.0.0.0 UG 0 0 0 enp0s3
default 192.168.0.1 0.0.0.0 UG 0 0 0 enp0s8
default 10.0.2.2 0.0.0.0 UG 100 0 0 enp0s3
10.0.2.0 0.0.0.0 255.255.255.0 U 100 0 0 enp0s3
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s8
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# ping google.com
ping: google.com: Temporary failure in name resolution
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# traceroute google.com
google.com: Temporary failure in name resolution
Cannot handle "host" cmdline arg `google.com' on position 1 (argc 1)
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auto enp0s8
iface enp0s8 inet static
address 192.168.0.2
netmask 255.255.255.0
gateway 192.168.0.1
broadcast 192.168.0.255
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# ip route list
default via 10.0.2.15 dev enp0s3 scope link
default via 192.168.0.1 dev enp0s8 onlink
default via 10.0.2.2 dev enp0s3 proto static metric 100
10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 metric 100
192.168.0.0/24 dev enp0s8 proto kernel scope link src 192.168.0.2
Thank you.