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Dell PowerEdge Systems Red Hat Enterprise Linux 8 Release Notes

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NetworkManager may restart unexpectedly when creating greater than 256 VLAN devices configured with DHCP IP

Description
On RHEL 8.3, when more than 256 VLAN devices are created and configured with DHCP IP, NetworkManager utility may restart unexpectedly resulting in not creating expected number of VLAN devices and some VLAN interfaces may not receive DHCP IP.
Workaround
  1. Increase the limit on number of files that NetworkManager can open as below:
    1. Create file/etc/systemd/system/NetworkManager.service.d/set-limit-nofile.conf
    2. Add following lines to /etc/systemd/system/NetworkManager.service.d/set-limit-nofile.conf [Service] LimitNOFILE=65536
    3. systemctl daemon-reload
    4. systemctl restart NetworkManager or reboot the system after step (b).
  2. Disable IPv6 configuration for the VLAN interfaces at the time of connection activation. Instead of disabling IPv6 in two steps, disable it in a single step as shown below.
    1. Merge steps b) and c) to a single step d).
    2. nmcli con add type vlan ifname <interface name> con-name <connection name> dev <device name> id <vlan id>
    3. nmcli con modify <connection name> ipv6.method disable
    4. nmcli con add type vlan ifname <interface name> con-name <connection name> dev <device name> id <vlan id> ipv6.method disabled
Solution
This issue is resolved in Red Hat Enterprise Linux 8.4.
Systems affected
All Dell EMC PowerEdge systems
Applies to
Red Hat Enterprise Linux 8.0 and later
Tracking number
191829

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