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IDProjectCategoryView StatusLast Update
0000351AlmaLinux-8NetworkManagerpublic2023-08-03 22:50
Reportersquanto Assigned Toalukoshko  
PrioritynormalSeveritymajorReproducibilityalways
Status closedResolutionfixed 
Summary0000351: IPv6 only network on bond lacp interface
DescriptionHello,

We have discovered a strange bug related to IPv6-only machines.
Just default Almalinux-8 installation (in my case it was 8.6 but upgrade to 8.7 makes no difference)
We have two network interfaces and we like to have bond interface using LACP.
Key point: it is ipv6-only network, so ipv4 address is not exist in the configuration, only ipv6 address

After installation, networkmanager is constantly hanging (disabling slaves, then bond, then try to enable it again, and so on). Its fully working btw, once it get it up - network is working perfectly but then NetworkManager "detect" something wrong and disabling slaves and bond itself.

Reproduced on multiple machines, seems not related to network drivers and specific network card.

Easy fix: just add dummy IPv4 to config with /32 prefix without gateway fix the issue and LACP are keeping to be up.
Steps To Reproduce* Install AL-8 with two network interfaces, creating bond interface on top of it with mode 802.3ad
* Use only IPv6 address on bond0 interface
* NetworkManager getting it up and down all the time
Additional Information/etc/sysconfig/network-scripts/ifcfg-bond0

BONDING_OPTS="mode=802.3ad downdelay=300 miimon=300 updelay=300 xmit_hash_policy=layer2+3 lacp_rate=1"
TYPE=Bond
BONDING_MASTER=yes
MTU=1500
PROXY_METHOD=none
BROWSER_ONLY=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6ADDR=2a03:xxxx:x:xxx::/64
IPV6_DEFAULTGW=fe80::1
DNS1=2606:4700:4700::1111
DNS2=2001:4860:4860::8888
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=bond0
UUID=77ef3081-faad-4425-813a-d381119108da
DEVICE=bond0
ONBOOT=yes

Adding:

IPADDR=172.17.32.2
PREFIX=32

fix the issue

relevant logs during hanging:

NetworkManager[1007]: <info> [1672503040.0889] device (bond0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
NetworkManager[1007]: <info> [1672503040.0892] manager: NetworkManager state is now CONNECTED_LOCAL
NetworkManager[1007]: <warn> [1672503040.0893] device (bond0): Activation: failed for connection 'bond0'
kernel: bond0: (slave enp1s0f0): Releasing backup interface
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squanto

2023-07-12 14:27

reporter   ~0000923

It looks like this issue it not anymore reproducible in Almalinux 8.8
So you may close this issue

Issue History

Date Modified Username Field Change
2022-12-31 16:32 squanto New Issue
2023-07-12 14:27 squanto Note Added: 0000923
2023-08-03 22:50 alukoshko Assigned To => alukoshko
2023-08-03 22:50 alukoshko Status new => closed
2023-08-03 22:50 alukoshko Resolution open => fixed