Bug ID 1953301: IPV4 or IPv6 connection over IPsec ESP tunnel using IPv6 fails due to null-mac-address from BIG-IP to client when using l2-forward

Last Modified: Jun 28, 2025

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1

Opened: May 21, 2025

Severity: 3-Major

Symptoms

Ping or tcp connection over IPv4 or IPV6 fails

Impact

No connectivity

Conditions

When connection is going from a client to a device on the other side of the IPsec ESP tunnel with l2-forward being used.

Workaround

Use ip-forward instead of l2-forward

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips