XPost: linux.debian.bugs.dist, linux.kernel   
   From: carnil@debian.org   
      
   Hi Ian,   
      
   On Fri, Nov 21, 2025 at 11:50:14AM -0500, Ian MacDonald wrote:   
   > On Fri, Nov 21, 2025 at 1:08 AM Mika Westerberg   
   >  wrote:   
   > > Okay "breaks" is probably too strong word here. It was never even supported   
   > > :)   
   > Agreed, let's say the "magic fades".  I am guessing the same magic   
   > that allows this 0x8086 component to appear out of thin air.   
   > thunderbolt 0-2: new host found, vendor=0x8086 device=0x1   
   > >   
   > > Can you describe what are the actual commands you run so I can try to   
   > > setup on my side and see how this could be implemented?   
   >   
   > Sure, first the working variant for active-backup.   
   >   
   > One side shown in netplan using a single yaml file (Ubuntu 24.04 server)   
   >   
   > root@ai2:~# networkctl status bond0   
   > ● 3: bond0   
   >                    Link File: /usr/lib/systemd/network/99-default.link   
   >                 Network File: /run/systemd/network/10-netplan-bond0.network   
   >                        State: routable (configured)   
   >                 Online state: online   
   >                         Type: bond   
   >                         Kind: bond   
   >                       Driver: bonding   
   >             Hardware Address: 02:92:d5:a7:f4:79   
   >                          MTU: 1500 (min: 68, max: 65535)   
   >                        QDisc: noqueue   
   > IPv6 Address Generation Mode: eui64   
   >                         Mode: active-backup   
   >                       Miimon: 500ms   
   >                      Updelay: 0   
   >                    Downdelay: 0   
   >     Number of Queues (Tx/Rx): 16/16   
   >             Auto negotiation: no   
   >                      Address: 10.10.13.2   
   >                               fe80::92:d5ff:fea7:f479   
   >            Activation Policy: up   
   >          Required For Online: yes   
   >            DHCP6 Client DUID: DUID-EN/Vendor:0000ab11ccb509966215f387   
   >   
   > Nov 21 16:10:03 ai2 systemd-networkd[720]: bond0: netdev ready   
   > Nov 21 16:10:03 ai2 systemd-networkd[720]: bond0: Configuring with   
   > /run/systemd/network/10-netplan-bond0.network.   
   > Nov 21 16:10:03 ai2 systemd-networkd[720]: bond0: Link UP   
   > Nov 21 16:10:08 ai2 systemd-networkd[720]: bond0: Gained carrier   
   > Nov 21 16:10:09 ai2 systemd-networkd[720]: bond0: Gained IPv6LL   
   >   
   > root@ai2:~# cat /etc/netplan/60-bonded-init.yaml   
   > network:   
   >   version: 2   
   >   renderer: networkd   
   >   
   >   ethernets:   
   >     thunderbolt0:   
   >       dhcp4: false   
   >   
   >     thunderbolt1:   
   >       dhcp4: false   
   >   
   >   bonds:   
   >     bond0:   
   >       interfaces: [thunderbolt0, thunderbolt1]   
   >       dhcp4: false   
   >       addresses: [10.10.13.2/30]   
   >       parameters:   
   >         mode: active-backup   
   >         mii-monitor-interval: 500   
   >   
   > The other side using a 3 file systemd-networkd variant (using on Debian 13)   
   >   
   > ai4:/etc/systemd/network# networkctl status bond0   
   > ● 3: bond0   
   >                  NetDev File: /etc/systemd/network/50-bond0.netdev   
   >                    Link File: /usr/lib/systemd/network/99-default.link   
   >                 Network File: /etc/systemd/network/53-bond0.network   
   >                        State: routable (configured)   
   >                 Online state: online   
   >                         Type: bond   
   >                         Kind: bond   
   >                       Driver: bonding   
   >             Hardware Address: 02:0f:03:70:86:fb   
   >                          MTU: 1500 (min: 68, max: 65535)   
   >                        QDisc: noqueue   
   > IPv6 Address Generation Mode: eui64   
   >                         Mode: active-backup   
   >                       Miimon: 500ms   
   >                      Updelay: 0   
   >                    Downdelay: 0   
   >     Number of Queues (Tx/Rx): 16/16   
   >             Auto negotiation: no   
   >                      Address: 10.10.13.1   
   >                               fe80::f:3ff:fe70:86fb   
   >            Activation Policy: up   
   >          Required For Online: yes   
   >           DHCPv6 Client DUID: DUID-EN/Vendor:0000ab112f49d10231f668bf   
   >   
   > Nov 21 11:21:55 ai4 systemd-networkd[700]: bond0: netdev ready   
   > Nov 21 11:21:55 ai4 systemd-networkd[700]: bond0: Configuring with   
   > /etc/systemd/network/53-bond0.network.   
   > Nov 21 11:21:55 ai4 systemd-networkd[700]: bond0: Link UP   
   > Nov 21 11:22:01 ai4 systemd-networkd[700]: bond0: Gained carrier   
   > Nov 21 11:22:02 ai4 systemd-networkd[700]: bond0: Gained IPv6LL   
   >   
   > ai4:/etc/systemd/network# cat 50-bond0.netdev   
   > # /etc/systemd/network/50-bond0.netdev   
   > [NetDev]   
   > Name=bond0   
   > Kind=bond   
   >   
   > [Bond]   
   > MIIMonitorSec=0.5s   
   > Mode=active-backup   
   > FailOverMACPolicy=none   
   >   
   > ai4:/etc/systemd/network# cat 52-thunderbolt-bond0-slaves.network   
   > # /etc/systemd/network/52-thunderbolt-bond0-slaves.network   
   > [Match]   
   > Name=thunderbolt0 thunderbolt1   
   >   
   > [Network]   
   > Bond=bond0   
   >   
   > ai4:/etc/systemd/network# cat 53-bond0.network   
   > # /etc/systemd/network/53-bond0.network   
   > [Match]   
   > Name=bond0   
   >   
   > [Network]   
   > Address=10.10.13.1/30   
   >   
   > Changing the mode to LACP/802.3ad then results in the observed mac   
   > setting issues.   
   >   
   > systemd-networkd/Debian Side:   
   >   
   > ai4:/etc/systemd/network# cat 50-bond0.netdev   
   > # /etc/systemd/network/50-bond0.netdev   
   > [NetDev]   
   > Name=bond0   
   > Kind=bond   
   >   
   > [Bond]   
   > MIIMonitorSec=0.5s   
   > Mode=802.3ad   
   > TransmitHashPolicy=layer3+4   
   >   
   > and the netplan/Ubuntu Side:   
   >   
   > root@ai2:/etc/netplan# cat 60-bonded-init.yaml   
   > network:   
   >   version: 2   
   >   renderer: networkd   
   >   
   >   ethernets:   
   >     thunderbolt0:   
   >       dhcp4: false   
   >   
   >     thunderbolt1:   
   >       dhcp4: false   
   >   
   >   bonds:   
   >     bond0:   
      
   [continued in next message]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)