I am running Ubuntu Server 16.04 with two on-board NICs. Ubuntu sees both cards, but both eth0 and eth1 will only pass traffic out of one physical interface, although they are configured separately (I think). Information is below:
lshw -C network
*-network
description: Ethernet interface
product: 82579LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 04
serial: 54:be:f7:65:9a:9b
size: 1Gbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.13-4 ip=172.22.1.112 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:26 memory:f7e00000-f7e1ffff memory:f7e39000-f7e39fff ioport:f080(size=32)
*-network
description: Ethernet interface
product: 82574L Gigabit Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: eth1
version: 00
serial: 54:be:f7:65:9a:9c
size: 1Gbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=2.1-3 ip=172.22.1.113 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:18 memory:f7d00000-f7d1ffff ioport:e000(size=32) memory:f7d20000-f7d23fff
/etc/network/interfaces:
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet dhcp
# The secondary network interface
auto eth1
iface eth1 inet dhcp
Thank you for any help!
ifconfig:
eth0 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9b
inet addr:172.22.1.112 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:61 errors:0 dropped:0 overruns:0 frame:0
TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5880 (5.8 KB) TX bytes:1436 (1.4 KB)
Interrupt:20 Memory:f7e00000-f7e20000
eth1 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9c
inet addr:172.22.1.113 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1093 errors:0 dropped:0 overruns:0 frame:0
TX packets:575 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:88205 (88.2 KB) TX bytes:42753 (42.7 KB)
Interrupt:18 Memory:f7d00000-f7d20000
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:160 errors:0 dropped:0 overruns:0 frame:0
TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:11840 (11.8 KB) TX bytes:11840 (11.8 KB)
route -n:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.22.1.1 0.0.0.0 UG 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
route -n with eth0 unplugged. Cannot access either ip address.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.22.1.1 0.0.0.0 UG 0 0 0 eth0
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
Script with eth0 disconnected
eth0 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9b
inet addr:172.22.1.112 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9b/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:28527 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2202058 (2.2 MB) TX bytes:1372 (1.3 KB)
Interrupt:20 Memory:f7e00000-f7e20000
eth1 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9c
inet addr:172.22.1.113 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:31516 errors:0 dropped:0 overruns:0 frame:0
TX packets:1730 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6125004 (6.1 MB) TX bytes:155950 (155.9 KB)
Interrupt:18 Memory:f7d00000-f7d20000
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:160 errors:0 dropped:0 overruns:0 frame:0
TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:11840 (11.8 KB) TX bytes:11840 (11.8 KB)
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.22.1.1 0.0.0.0 UG 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=27.4 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=58 time=25.8 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=58 time=27.8 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=58 time=26.6 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=58 time=26.6 ms
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4007ms
rtt min/avg/max/mdev = 25.818/26.897/27.860/0.733 ms
Script with eth1 disconnected
eth0 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9b
inet addr:172.22.1.112 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28540 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2202968 (2.2 MB) TX bytes:1372 (1.3 KB)
Interrupt:20 Memory:f7e00000-f7e20000
eth1 Link encap:Ethernet HWaddr 54:be:f7:65:9a:9c
inet addr:172.22.1.113 Bcast:172.22.1.255 Mask:255.255.255.0
inet6 addr: fe80::56be:f7ff:fe65:9a9c/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:31528 errors:0 dropped:0 overruns:0 frame:0
TX packets:1735 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6125988 (6.1 MB) TX bytes:156460 (156.4 KB)
Interrupt:18 Memory:f7d00000-f7d20000
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:160 errors:0 dropped:0 overruns:0 frame:0
TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:11840 (11.8 KB) TX bytes:11840 (11.8 KB)
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.22.1.1 0.0.0.0 UG 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
172.22.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
--- 8.8.8.8 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4031ms
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