How to stop eth0 ip route allocation

mashaofeng · ‎05-18-2020

when imx8 started , we can see it's route and ifconfig configuration is ：

Destination Gateway Genmask Flags Metric Ref Use Iface

0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 br0

192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br0

root@imx8qxpmek:~# ifconfig

br0 Link encap:Ethernet HWaddr 1e:a3:e1:e8:c8:cd

inet addr:192.168.1.18 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::d45f:9fff:fe62:de10/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:123 errors:0 dropped:0 overruns:0 frame:0

TX packets:23 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:13012 (12.7 KiB) TX bytes:1334 (1.3 KiB)

eth0 Link encap:Ethernet HWaddr be:dc:ce:a6:21:3f

inet6 addr: fe80::bcdc:ceff:fea6:213f/64 Scope:Link

UP BROADCAST RUNNING MULTICAST DYNAMIC MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:150 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:18518 (18.0 KiB)

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:119 errors:0 dropped:0 overruns:0 frame:0

TX packets:119 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:11444 (11.1 KiB) TX bytes:11444 (11.1 KiB)

usb0 Link encap:Ethernet HWaddr 1e:a3:e1:e8:c8:cd

inet6 addr: fe80::1ca3:e1ff:fee8:c8cd/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:128 errors:0 dropped:4 overruns:0 frame:0

TX packets:2 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:13339 (13.0 KiB) TX bytes:268 (268.0 B)

but after few seconds (0 to 30 second)，it will change to follow status：

Destination Gateway Genmask Flags Metric Ref Use Iface

0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 eth0

0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 br0

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 br0

root@imx8qxpmek:~# ifconfig

br0 Link encap:Ethernet HWaddr 1e:a3:e1:e8:c8:cd

inet addr:192.168.1.18 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::d45f:9fff:fe62:de10/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:123 errors:0 dropped:0 overruns:0 frame:0

TX packets:67 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:13012 (12.7 KiB) TX bytes:3238 (3.1 KiB)

eth0 Link encap:Ethernet HWaddr be:dc:ce:a6:21:3f

inet addr:169.254.97.105 Bcast:169.254.255.255 Mask:255.255.0.0

inet6 addr: fe80::bcdc:ceff:fea6:213f/64 Scope:Link

UP BROADCAST RUNNING MULTICAST DYNAMIC MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:203 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:21952 (21.4 KiB)

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:225 errors:0 dropped:0 overruns:0 frame:0

TX packets:225 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:21078 (20.5 KiB) TX bytes:21078 (20.5 KiB)

usb0 Link encap:Ethernet HWaddr 1e:a3:e1:e8:c8:cd

inet6 addr: fe80::1ca3:e1ff:fee8:c8cd/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:128 errors:0 dropped:4 overruns:0 frame:0

TX packets:2 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:13339 (13.0 KiB) TX bytes:268 (268.0 B)

root@imx8qxpmek:~#

the follow route have bad influence to our product

0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

i try to delete the route , but the first one can not be delelted;

how to stop route allocation for eth0 ?

jimmychan · ‎05-19-2020

You may set a fix IP to it

mashaofeng · ‎05-21-2020

from the follow link on nxp community

disable imx8mq default eth0 dhcp

use " systemctl disable connman " can make eth0 dhcp stop

but the first bringup of the board will have issue;

it seems we must delete connman.service when compile ;

i cannot sure whether it have other influence;

thanks

jimmychan · ‎05-21-2020

Have you try to set the IP in u-boot bootargs?

e.g. (https://community.nxp.com/message/866455?commentID=866455#comment-866455 )

setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gateway}:${netmask}::eth0

mashaofeng · ‎05-19-2020

i add fix ip to it , but it's still have new ip route :

root@imx8qxpmek:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
0.0.0.0         0.0.0.0         0.0.0.0         U     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 br0

root@imx8qxpmek:/# ifconfig
br0       Link encap:Ethernet HWaddr 3e:f2:d4:d1:61:10
          inet addr:192.168.1.18 Bcast:192.168.1.255 Mask:255.255.255.0
          inet6 addr: fe80::3cf2:d4ff:fed1:6110/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:248 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:27349 (26.7 KiB) TX bytes:1140 (1.1 KiB)

eth0      Link encap:Ethernet HWaddr 3e:f2:d4:d1:61:10
          inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
          inet6 addr: fe80::3cf2:d4ff:fed1:6110/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST DYNAMIC MTU:1500 Metric:1
          RX packets:248 errors:0 dropped:0 overruns:0 frame:0
          TX packets:97 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:32309 (31.5 KiB) TX bytes:8534 (8.3 KiB)

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:36899 errors:0 dropped:0 overruns:0 frame:0
          TX packets:36899 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2651084 (2.5 MiB) TX bytes:2651084 (2.5 MiB)

usb0      Link encap:Ethernet HWaddr f6:4b:61:00:11:f1
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

we use follow service to control net configuration :

[Unit]
Description=dias network configuration
After=network.target
DefaultDependencies=yes

[Service]
ExecStart=/bin/bash -c "/sbin/ip addr add 0/32 dev eth0 \
                      ifconfig eth0 netmask 255.255.255.0 broadcast 192.168.1.255 0 up; \
                      echo \"nameserver 114.114.114.114\" > /etc/resolv.conf; \
                      echo \"nameserver 8.8.8.8\" >> /etc/resolv.conf; \
                      ifconfig usb0 netmask 255.255.255.0 broadcast 192.168.1.255 0 up; \
                      ifconfig eth0 down; ifconfig eth0 192.168.1.66 up; ifconfig usb0 down; ifconfig usb0 0 up; \
                      brctl addbr br0; brctl addif br0 eth0; brctl addif br0 usb0; ifconfig br0 192.168.1.18 up; \
                      sleep 45 && route add default gw 192.168.1.1; \
        "

[Install]
WantedBy=multi-user.target

thanks

How to stop eth0 ip route allocation

How to stop eth0 ip route allocation

i.MX 8 Family | i.MX 8QuadMax (8QM) | 8QuadPlus