Memory usage constantly increases on Security Gateway running on Gaia OS and SecurePlatform OS

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Solution ID	sk95128
Product	Security Gateway, IPSec VPN
Version	R75.40, R75.40VS, R75.45, R75.46, R75.47, R76
OS	Gaia, SecurePlatform 2.6
Platform / Model	All
Date Created	23-Sep-2013
Last Modified	08-Jan-2018

Symptoms

Output of 'fw ctl pstat' command on Security Gateway shows that memory consumption constantly increases.
Security Gateway machine runs out of memory.
/var/log/messages files repeatedly show that Out-of-Memory (OOM) mechanism is invoked by Linux kernel:
Daemon_Name invoked oom-killer
/var/log/messages files repeatedly show various issue with memory allocation:
nmpd[PID]: Error allocating more space for arpcache.

Cause

There are scenarios, when the current FireWall memory allocation limit does not stop the FireWall from allocating additional memory on time - for example, during resiliency tests, and concurrent connections tests on traffic from IP range of Class B to IP range of Class B.

Solution

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