Last Modified: Feb 13, 2026
Affected Product(s):
BIG-IP MA-All
Known Affected Versions:
17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1
Opened: Feb 10, 2026 Severity: 2-Critical
When eth2 DHCP lease renews on rSeries tenant, management interface IP is incorrectly changed to eth2 IP (100.69.1.1/24) causing loss of remote management access. This can occur when eth2 renews the lease after 999 days or when executing manual command to renew eth2's DHCP lease (dhclient -r). Logs similar to the following can be seen from the tenant's /var/log/boot.log: info dhcp_config[20430]: management_ip = 100.69.1.1 info dhcp_config[20430]: F5::COAPI::TransactionalSave Succeeded. info dhcp_config[20430]: domain_search = <default.svc.cluster.local. svc.cluster.local. cluster.local. chassis.local.> info dhcp_config[20430]: domain_name = <default.svc.cluster.local> info dhcp_config[20430]: In update_ltcfg_field(). info dhcp_config[20430]: LTCFG Field => ('dns', 'search', 'dns') info dhcp_config[20430]: New value => 'default.svc.cluster.local.,svc.cluster.local.,cluster.local.,chassis.local.' info dhcp_config[20430]: Existing value => 'localhost' info dhcp_config[20430]: dns_servers = <10.10.1.10> info dhcp_config[20430]: In update_ltcfg_field(). info dhcp_config[20430]: LTCFG Field => ('dns', 'nameservers', 'dns') info dhcp_config[20430]: New value => '10.10.1.10' info dhcp_config[20430]: Existing value => '10.10.1.241,10.10.1.242,10.10.1.243' info dhcp_config[20430]: In update_ltcfg_config_source() for 'dns'. info dhcp_config[20430]: New 'config_source' value => '0' info dhcp_config[20430]: Existing value => '0' info dhcp_config[20430]: No change in 'config_source' for 'dns'. Skip update. info dhcp_config[20430]: In update_ltcfg_field(). info dhcp_config[20430]: LTCFG Field => ('dns', 'description', 'dns') info dhcp_config[20430]: New value => 'configured-by-dhcp' info dhcp_config[20430]: Existing value => '' info dhcp_config[20430]: F5::COAPI::TransactionalSave Succeeded. info dhcp_config[20430]: hostname = 'bigip1.default.svc.cluster.local' info dhcp_config[20430]: In update_ltcfg_field(). info dhcp_config[20430]: LTCFG Field => ('system', 'hostname', 'system') info dhcp_config[20430]: New value => 'bigip1.default.svc.cluster.local' info dhcp_config[20430]: Existing value => 'bigip1.default.svc.cluster.local' info dhcp_config[20430]: No change in ltcfg field 'hostname'. Skip update. info dhcp_config[20430]: Successfully finished the execution of /usr/libexec/dhcp-config. Notice that in addition to changing the management IP address it also changes the DNS and hostname.
Loss of remote connectivity to management interface.
- rSeries tenant running for 999 days and its DHCP-enabled eth2 interface renews the lease. - This may also occur if an administrator manually executes a command that forces eth2 to renew its lease.
Reboot the affected BIG-IP tenant or change tenant state from "deployed" to "configured" and back to "deployed" via F5OS host. DNS and hostname settings may also need to be changed back to their previous value.
None