Bug ID 670245: IP forwarding virtual server drops packets with TTL of 1 in TTL preserve mode

Last Modified: Sep 13, 2023

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

Known Affected Versions:
12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Jun 21, 2017

Severity: 3-Major


FastL4/IP forwarding virtual server configured to preserve TTL on forwarding, drops ingress packets with a TTL of 1.


Packets are dropped.


- FastL4 IP forwarding virtual server with a ip-ttl-mode configured to 'preserve'. - Packets with TTL of 1.


Change TTL mode on the FastL4 profile.

Fix Information

The BIG-IP system no longer drops packers with TTL of 1 when configured with TTL mode of 'preserve'.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips