"RTNETLINK answers: Operation not supported" when trying to add a bridge device

[bipin_nair]

Hello. I am using a version of build_t4240rdb-64b But with the following additional options in the file pointed to by KERNEL_DEFCONFIG

CONFIG_NET_IP_TUNNEL=y
CONFIG_INET_XFRM_TUNNEL=y
CONFIG_INET_TUNNEL=y
CONFIG_INET_XFRM_MODE_TUNNEL=y
CONFIG_INET6_XFRM_MODE_TUNNEL=y
CONFIG_TUN=y
CONFIG_NETFILTER_NETLINK=y
CONFIG_NETFILTER_NETLINK_QUEUE=y
CONFIG_NETFILTER_NETLINK_LOG=y
CONFIG_NF_CT_NETLINK=y
CONFIG_SCSI_NETLINK=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_NET_SCH_INGRESS=y
CONFIG_NET_SCHED=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_NETFILTER_XT_TARGET_MARK=y

After bringing up the image I am now trying to add a bridge device, but I get -

root@t4240rdb:~# ip link add name br0 type bridge
RTNETLINK answers: Operation not supported

Please let me know what configuration option I am missing.

Thanks a lot,

Elliot

[yipingwang · Accepted solution]

Hello Elliot Black,

Please Enable Ethernet bridging in linux kernel as the following.

[*] Networking support  --->
 Networking options  --->
  <*> 802.1d Ethernet Bridging
  [*]   IGMP/MLD snooping (NEW)

Please refer to the following Kernel options.

root@t2080rdb:~#  zcat /proc/config.gz | grep BRIDGE
CONFIG_BRIDGE_NETFILTER=m
# CONFIG_BRIDGE_NF_EBTABLES is not set
CONFIG_BRIDGE=y
CONFIG_BRIDGE_IGMP_SNOOPING=y

In addition, you also could refer to the following commands to setup bridge.

ifconfig eth0 down

ifconfig eth1 down

brctl addbr br0

brctl addif br0 eth0

brctl addif br0 eth1

ifconfig br0 192.85.1.100

Have a great day,
TIC

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[bipin_nair]

After adding the following configuration options to my CONFIG file I recompiled the kernel and the linux image with the following commands  -
bitbake -c cleansstate virtual/kernel

bitbake -f virtual/kernel -c compile

bitbake virtual/kernel

bitbake fsl-image-full

and I am able boot the image and create a bridge device with the following command -

brctl addbr br0.

Thank you.