ipt_ACCOUNT Archives

Subject: Re: ipt_ACCOUNT ipv6 support

From: Neal Murphy <neal.p.murphy@xxxxxxxxxxxx>
To: ipt_ACCOUNT@xxxxxxxxxxxxxxxxxxxxxxx
Cc: Anton Khalikov <anton@xxxxxxxxxxx>
Date: Fri, 23 Jan 2015 01:56:06 -0500
On Friday, January 23, 2015 01:24:46 AM Anton Khalikov wrote:
> Hello everyone
> I wonder if there are any plans to add ipv6 support to ipt_ACCOUNT? I
> know there is shiny new nfacct tool but it is useless when it comes to
> task to count traffic on per host basis on large networks. And also
> there is conntrack, but again, it becomes useless and even bottleneck
> during DDoS attacks while ipt_ACCOUNT never failed. ipt_ACCOUNT stayed
> alive and didn't eat CPU too much even when 1Gbps and 600kpps DDoS
> happened. So at the moment there is no high performance and low CPU
> usage substitution for ipt_ACCOUNT from my point of view. You guys did a
> great job and thank you for that. Would you like to continue?

As I recall from looking at it and my recent experiences, iptACCOUNT will 
require a serious rewrite to handle IPv6. It uses a kernel page to store stats 
for an IPv4 /24 (bytes & packets; in & out). Since IPv6 addresses are 
typically anywhere within a /64, that method becomes unworkable (unthinkable, 

Another problem is that it uses 32-bit counters. They roll over in about 34 
seconds at saturated gigE speeds. At 10G speeds, they can roll over in barely 
more than 3 seconds.

The last problem I can readily identify is that IPv6 uses
  - link local addresses
  - a prefix for DHCP-assigned addresses
  - a prefix for SLAAC addresses
  - possibly a prefix for private addresses
That's potentially four addresses per NIC that must be tracked.

I haven't yet thought of a way to modernize iptACCOUNT and remain efficient 
That bolt of lightning over my head hasn't flashed on yet.

I seem to recall reading about ipset being enhanced to track per-address 
stats. It might be efficient if it was written like the rest of ipset.


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