# /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
# i know, i know. i should not be using 15.0.0.1
# i promise i will change this. but this is not the problem at hand
#auto eth1
#iface eth1 inet static
#address 15.0.0.1
#network 15.0.0.0
#netmask 255.255.0.0
-bash-4.3$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:29:78:fa:99
inet addr:192.168.37.129 Bcast:192.168.37.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe78:fa99/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9507 errors:0 dropped:0 overruns:0 frame:0
TX packets:6247 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1326949 (1.3 MB) TX bytes:598378 (598.3 KB)
Interrupt:17 Base address:0x1080
eth1 Link encap:Ethernet HWaddr 00:0c:29:78:fa:a3
inet6 addr: fe80::20c:29ff:fe78:faa3/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:635 errors:0 dropped:15 overruns:0 frame:0
TX packets:561 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:91030 (91.0 KB) TX bytes:94869 (94.8 KB)
Interrupt:19 Base address:0x1400
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:452 errors:0 dropped:0 overruns:0 frame:0
TX packets:452 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:36015 (36.0 KB) TX bytes:36015 (36.0 KB)
tap0 Link encap:Ethernet HWaddr b2:55:32:bd:76:6b
inet addr:172.16.0.83 Bcast:172.16.0.255 Mask:255.255.255.0
inet6 addr: fe80::b055:32ff:febd:766b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1420 errors:0 dropped:0 overruns:0 frame:0
TX packets:740 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:219848 (219.8 KB) TX bytes:113105 (113.1 KB)
-bash-4.3$ ip route
default via 192.168.37.2 dev eth0
169.254.0.0/16 dev eth0 scope link metric 1000
172.16.0.0/24 dev tap0 proto kernel scope link src 172.16.0.83
192.168.37.0/24 dev eth0 proto kernel scope link src 192.168.37.129