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Description of problem: When you issue ip link add ifb_X type ifb, two more ifb links get created - ifb0 and ifb1. These links can be safely removed thereafter. This only happens when creating first ifb link after reboot. Creating second ifb link (with or without prior removal of ifb0 and ifb1) does not lead to more bogus ifb links. Version-Release number of selected component (if applicable): iproute.x86_64 4.1.1-3.fc23 @updates How reproducible: once every reboot Steps to Reproduce: 1. reboot 2. see ip link 3. ip link add ifb_X type ifb 4. see ip link Actual results: 1. no ifb links 4. 13: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 32 link/ether 7a:27:f5:e3:5f:ca brd ff:ff:ff:ff:ff:ff 14: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 32 link/ether 56:39:4e:f7:d4:ca brd ff:ff:ff:ff:ff:ff 15: ifb_X: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 32 link/ether 16:99:b7:dc:61:98 brd ff:ff:ff:ff:ff:ff Expected results: 1. no ifb links 4. 13: ifb_X: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 32 link/ether 16:99:b7:dc:61:98 brd ff:ff:ff:ff:ff:ff Additional info:
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Hi, This is expected behaviour and common with some legacy virtual interface drivers such as bond.ko or dummy.ko. In order to prevent ifb.ko from creating these initial interfaces, pass 'numifbs=0' module parameter when loading it. This device creating upon module loading is a relict from the past when there was no 'ip link add' functionality. Sadly though, any attempts at getting rid of it were torn down reasoning that it might break existing userspace scripts. Of course it's ridiculous that this relatively new driver (from 2006) still implements this obsolete behaviour, yet same argument applies to it as well so it can't be removed anymore. Cheers, Phil