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Does anyone have any idea about ebtables rule count limitations? It starts giving this error around 26000 rules for filter table :

[root@localhost 09]# ebtables -A testchain1 -p IPv4 --ip-src 'ipv4.x.x.x' -s 'mac:x:x:x:x:x' -j ACCEPT

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. . [root@localhost 09]#

There is free RAM while SWAP is fully used.

Jevin Gala
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  • Are you using an ancient and/or 32-bit kernel? (post the output of `uname -a`) – anx Sep 24 '20 at 07:32
  • Linux localhost.servers.com **3.10.0-957.5.1.el7.x86_64** #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 **x86_64** GNU/Linux And **ebtables.x86_64 : 2.0.10-16.el7** – Jevin Gala Sep 24 '20 at 10:10

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