In Precise I brought up eth0 with ifup and wlan0 with NetworkManager, as
shown below. The result is two default routes which isn't a problem in
itself. The problem is that NM assigns a lower metric (0) to the wlan0
default route than ifup assigned to the eth0 default route (100), which
causes the kernel to send most traffic over wlan0. If I manually assign
a metric of 200 to the "default via 192.168.1.254 dev wlan0 proto
static" route then traffic is directed to eth0.
I don't know how this should be solved.
=============================================
# # network-manager is stopped at this point
# grep -v '^$' /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile
dns=dnsmasq
no-auto-default=F0:DE:F1:6B:22:BF,
[ifupdown]
managed=false
# grep -v '^$' /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.1.30
netmask 255.255.255.0
gateway 192.168.1.254
# ifconfig
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:16436 Metric:1
RX packets:6853 errors:0 dropped:0 overruns:0 frame:0
TX packets:6853 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:536455 (536.4 KB) TX bytes:536455 (536.4 KB)
# ifup eth0
# ifconfig
eth0 Link encap:Ethernet HWaddr f0:de:f1:6b:22:bf
inet addr:192.168.1.30 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::f2de:f1ff:fe6b:22bf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4425 errors:0 dropped:0 overruns:0 frame:0
TX packets:4756 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2563417 (2.5 MB) TX bytes:688741 (688.7 KB)
Interrupt:20 Memory:f2500000-f2520000
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:16436 Metric:1
RX packets:7089 errors:0 dropped:0 overruns:0 frame:0
TX packets:7089 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:551439 (551.4 KB) TX bytes:551439 (551.4 KB)
# ip route show
default via 192.168.1.254 dev eth0 metric 100
169.254.0.0/16 dev eth0 scope link metric 1000
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.30
# start network-manager
network-manager start/running, process 7004
# # Enable networking in network-manager
# NM connects to wireless network
# ifconfig
eth0 Link encap:Ethernet HWaddr f0:de:f1:6b:22:bf
inet addr:192.168.1.30 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::f2de:f1ff:fe6b:22bf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4497 errors:0 dropped:0 overruns:0 frame:0
TX packets:4848 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2580263 (2.5 MB) TX bytes:702714 (702.7 KB)
Interrupt:20 Memory:f2500000-f2520000
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:16436 Metric:1
RX packets:7878 errors:0 dropped:0 overruns:0 frame:0
TX packets:7878 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:609728 (609.7 KB) TX bytes:609728 (609.7 KB)
wlan0 Link encap:Ethernet HWaddr a0:88:b4:71:83:10
inet addr:192.168.1.21 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::a288:b4ff:fe71:8310/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:36848 errors:0 dropped:0 overruns:0 frame:0
TX packets:26844 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:34907153 (34.9 MB) TX bytes:5777846 (5.7 MB)
# ip route show
default via 192.168.1.254 dev wlan0 proto static
default via 192.168.1.254 dev eth0 metric 100
169.254.0.0/16 dev eth0 scope link metric 1000
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.30
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.21 metric 2
# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 wlan0
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0
=============================================
Here's how it looks when NM controls both eth0 and wlan0:
=============================================
# ip route show
default via 192.168.1.254 dev eth0 proto static
169.254.0.0/16 dev eth0 scope link metric 1000
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.20 metric 1
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.21 metric 2
=============================================
** Summary changed:
- NM confused by combination of static and dynamic configured interfaces
+ NM assigns a lower metric to the default route over wlan than ifup assigns to
the default route over eth.
** Changed in: network-manager (Ubuntu)
Status: Incomplete => Confirmed
--
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Bugs, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/47379
Title:
NM assigns a lower metric to the default route over wlan than ifup
assigns to the default route over eth.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/47379/+subscriptions
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