Last Modified: Jul 11, 2024
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1
Fixed In:
17.1.1.2
Opened: Jan 19, 2024 Severity: 1-Blocking
Traffic throughput can be degraded.
Moderate to severe throughput drop is observed.
The tcpdump application is executed on high throughput systems.
As a general recommendation, use tcpdump filters described in K411 or K2289 while capturing the packets on moderately busy systems. However, on very busy systems, filters alone may not be enough. In this case, there is No workaround.
Added a new db key 'tmm.tcpdump.pkt.ratelimit'. The default value of this db key is '0'. Also, this is the same behavior with the previous fix. When the value is set to the default value (0), the TMM doesn’t do any rate limiting on the traffic that is sent to the tcpdump application. When the value is set to any other value x, then the TMM applies rate limit of the value x and sends x packets/sec on an average to tcpdump application during capture cycle. For example, if the db variable is set to 200, then each TMM sends an average of 200 pkts/sec to tcpdump application during the life cycle of tcpdump application.