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ip link add name br0 type bridge give Error: Unknown device

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denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Tue Dec 21, 2021 9:17 pm Post subject: ip link add name br0 type bridge give Error: Unknown device

hi as the title says

Code:

ip link add name br0 type bridge

Give

Code:

Error: Unknown device type.

everything it's up to date

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W

Posted: Tue Dec 21, 2021 9:34 pm Post subject:

denn0n,

Does your kernel have bridge support?

Code:

$ grep -i bridge /usr/src/linux/.config
CONFIG_BRIDGE_NETFILTER=y
CONFIG_NETFILTER_FAMILY_BRIDGE=y
# CONFIG_NF_CONNTRACK_BRIDGE is not set
CONFIG_BRIDGE_NF_EBTABLES=m
CONFIG_BRIDGE_EBT_BROUTE=m
CONFIG_BRIDGE_EBT_T_FILTER=m
CONFIG_BRIDGE_EBT_T_NAT=m
CONFIG_BRIDGE_EBT_802_3=m
CONFIG_BRIDGE_EBT_AMONG=m
CONFIG_BRIDGE_EBT_ARP=m
CONFIG_BRIDGE_EBT_IP=m
CONFIG_BRIDGE_EBT_IP6=m
CONFIG_BRIDGE_EBT_LIMIT=m
CONFIG_BRIDGE_EBT_MARK=m
CONFIG_BRIDGE_EBT_PKTTYPE=m
CONFIG_BRIDGE_EBT_STP=m
CONFIG_BRIDGE_EBT_VLAN=m
CONFIG_BRIDGE_EBT_ARPREPLY=m
CONFIG_BRIDGE_EBT_DNAT=m
CONFIG_BRIDGE_EBT_MARK_T=m
CONFIG_BRIDGE_EBT_REDIRECT=m
CONFIG_BRIDGE_EBT_SNAT=m
CONFIG_BRIDGE_EBT_LOG=m
CONFIG_BRIDGE_EBT_NFLOG=m
CONFIG_BRIDGE=y
CONFIG_BRIDGE_IGMP_SNOOPING=y

_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

CaptainBlood
Advocate

Joined: 24 Jan 2010
Posts: 3624

Posted: Tue Dec 21, 2021 9:35 pm Post subject:

Unsure whether this link matches your requirements... Thanks 4 ur attention, interest & support. _________________ USE="-* ..." in /etc/portage/make.conf here. LT: "I've been doing a passable imitation of the Fontana di Trevi, except my medium is mucus. Sooo much mucus. "

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Tue Dec 21, 2021 10:16 pm Post subject:

NeddySeagoon wrote:

denn0n,

Does your kernel have bridge support?

Code:

NeddySeagoon Thank You, the output it's

Code:

grep -i bridge /usr/src/linux/.config
CONFIG_NF_CONNTRACK_BRIDGE=m
# CONFIG_BRIDGE is not set
# PC-card bridges
CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y
# Display Interface Bridges
# end of Display Interface Bridges

do you suggest all the Configs as yours ?

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Tue Dec 21, 2021 10:17 pm Post subject:

CaptainBlood wrote:

Unsure whether this link matches your requirements...
Thanks 4 ur attention, interest & support.

Really Thank You ! I will do it !

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W

Posted: Tue Dec 21, 2021 10:22 pm Post subject:

denn0n,

You must have

Code:

CONFIG_BRIDGE=y

The other entries are to support netfilter on the bridge. That may be useful.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Wed Dec 22, 2021 1:21 am Post subject:

NeddySeagoon wrote:

denn0n,

You must have

Code:

CONFIG_BRIDGE=y

The other entries are to support netfilter on the bridge. That may be useful.

After do

Code:

cd /usr/src/linux
make menuconfig
[*] Networking support --->
Networking options --->
<*> 802.1d Ethernet Bridging
make && make modules_install
make install
genkernel --install --lvm --kernel-config=/usr/src/linux/.config initramfs

reboot

and

Code:

grep -i bridge /usr/src/linux/.config
# CONFIG_NF_CONNTRACK_BRIDGE is not set
# CONFIG_BRIDGE_NF_EBTABLES is not set
CONFIG_BRIDGE=y
CONFIG_BRIDGE_IGMP_SNOOPING=y
# CONFIG_BRIDGE_MRP is not set
# PC-card bridges
CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y
# Display Interface Bridges
# end of Display Interface Bridges

but still the same

Code:

ip link add name br0 type bridge
Error: Unknown device type.

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W

Posted: Wed Dec 22, 2021 10:20 am Post subject:

denn0n,

Are you using the kernel you think you are?
What in the time/date in

Code:

uname -a

Thats the build time/date of the running kernel. Is it what you expected?
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Wed Dec 22, 2021 4:29 pm Post subject:

NeddySeagoon wrote:

denn0n,

Are you using the kernel you think you are?
What in the time/date in

Code:

uname -a

Thats the build time/date of the running kernel. Is it what you expected?

NeddySeagoon

The output of

Code:

uname -a

it's

Code:

uname -a
Linux localhost.localdomain 5.10.49-gentoo-r1 #11 SMP Sat Sep 4 22:46:50 CDT 2021 x86_64 AMD A8-7410 APU with AMD Radeon R5 Graphics AuthenticAMD GNU/Linux

and as I see now It remains the same as first install since I just have install gentoo in this computer a few little more then 90 days a go or something like that

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W

Posted: Wed Dec 22, 2021 4:49 pm Post subject:

denn0n,

You missed a step in your kernel build or install.

What does

Code:

ls -l /boot

show?
It should be empty. Leave it if its not. Not empty usually means that you forgot to mount /boot for the kernel install steps.

Do

Code:

mount /boot

What does

Code:

ls -l /boot

show now?

As the kernel you are running is 5.10.49-gentoo-r1 which is an old kernel, you will probably need to update grub.cfg so that it knows about new kernels.

Provided that's the problem only the kernel install and grub.cfg steps need to be performed again.
The compiled kernel is still in /usr/src/linux, so no need to rebuild it.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Wed Dec 22, 2021 8:00 pm Post subject:

NeddySeagoon wrote:

denn0n,

You missed a step in your kernel build or install.

What does

Code:

ls -l /boot

show?
It should be empty. Leave it if its not. Not empty usually means that you forgot to mount /boot for the kernel install steps.

Do

Code:

mount /boot

What does

Code:

ls -l /boot

Yes i did

, I do it correctly and works as expected and the

Code:

uname -a

give now

Code:

Linux localhost.localdomain 5.10.49-gentoo-r1 #13 SMP Tue Dec 21 20:34:09 CST 2021 x86_64 AMD A8-7410 APU with AMD Radeon R5 Graphics AuthenticAMD GNU/Linux

and

Code:

ip link add name br0 type bridge

don't give any error

NeddySeagoon
Administrator

Joined: 05 Jul 2003
Posts: 54234
Location: 56N 3W

Posted: Wed Dec 22, 2021 8:31 pm Post subject:

denn0n,

I've done that so many times that

Code:

uname -a

is a part of my reboot after a kernel update process. :)
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

denn0n
Tux's lil' helper

Joined: 24 May 2020
Posts: 87

Posted: Thu Dec 23, 2021 12:57 am Post subject:

NeddySeagoon wrote:

denn0n,

I've done that so many times that

Code:

uname -a

is a part of my reboot after a kernel update process.

just have create a file to remember me those steps jajaja

Thank You NeddySeagoon, as always have you be really helpful

Hu
Moderator

Joined: 06 Mar 2007
Posts: 21624

Posted: Thu Dec 23, 2021 2:39 am Post subject:

To guard against this, you could have the initramfs prints the result of uname -a as part of its normal operation, so that the kernel's identification is always shown.

dimko
Apprentice

Joined: 12 Feb 2006
Posts: 196

Posted: Thu Feb 10, 2022 11:42 pm Post subject: Thats a very good point

NeddySeagoon wrote:

denn0n,

Are you using the kernel you think you are?
What in the time/date in

Code:

uname -a

Thats the build time/date of the running kernel. Is it what you expected?

It's exactly reason why you want to use modules whenever you can.
With modules, you know what is loaded or not if you lsmod.

IMHo compile bridge as module and:
modprobe bridge
then
lsmod |grep bridge
_________________
Just a user.

grknight
Retired Dev

Joined: 20 Feb 2015
Posts: 1659

Posted: Fri Feb 11, 2022 12:08 am Post subject: Re: Thats a very good point

dimko wrote:

You do not need to use modules to see if something is loaded. You just need to change your modprobe a bit to get a message:

Code:

modprobe --first-time bridge

This will say unknown if not built, nothing if it loads, or "already in kernel" if enabled including if built-in.

dimko
Apprentice

Joined: 12 Feb 2006
Posts: 196

Posted: Fri Feb 11, 2022 5:33 pm Post subject: Re: Thats a very good point

grknight wrote:

Code:

modprobe --first-time bridge

This will say unknown if not built, nothing if it loads, or "already in kernel" if enabled including if built-in.

Interesting!
Even "modprobe -h" doesn't have this argument!
_________________
Just a user.

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