Hi, I couldn’t find much information about the limitation on adding number of rules. I tried adding around 26000 rules and starting seeing this message : Unable to update the kernel. Two possible causes: 1. Multiple ebtables programs were executing simultaneously. The ebtables userspace tool doesn't by default support multiple ebtables programs running concurrently. The ebtables option --concurrent or a tool like flock can be used to support concurrent scripts that update the ebtables kernel tables. 2. The kernel doesn't support a certain ebtables extension, consider recompiling your kernel or insmod the extension. There is Free RAM while swap is fully used. Kernel : 3.10.0-957.5.1.el7.x86_64 ebtables.x86_64 2.0.10-16.el7 -- Regards, Jevin Gala Virtualizor support - Softaculous Ltd.