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3

I've tried sudo modprobe ip_conntrack to no avail.

I can't find anything about enabling this. Does anyone know how?

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I've upvoted the question and downvoted the March 12 answer. I've seen this issue as well. It appears that nf_conntrack has replaced ip_conntrack by 3.5 version kernels (if not earlier). Seems to be associated with the netf or netfilter modules. – belacqua Apr 2 '13 at 16:44
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/proc/net/ip_conntrack is deprecated. You must install the package apt-get install conntrack, and then you can run conntrack -L and see the result

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Looks like you have to use conntrack instead.

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Apparently doesn't work, but possibly there is not enough detail and I am using the wrong command(s). – belacqua Apr 2 '13 at 0:08
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When I can not find something which works on one kernel and on another same thing does not exist, I use this two universal commands (here adapted for finding conntrack):

sudo find /proc/ -name '*conntrack*'

or

sudo sysctl -a | grep conntrack

From first find command I learned that in my newest Debian testing with kernel (4.8.0-1-amd64), I can get data about all net connections similar to old /proc/net/ip_conntrack, by running this command:

sudo cat /proc/*/net/ip_conntrack | sort -u

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