On 6/25/19 11:41 PM, MRob wrote:
When fail2ban block a IP address, established connections are allowed
to continue, but with no rule to accept established connections how is
that possible?
It doesn't look like it would be.
1: Open a connection that will demonstrate the problem later.
2: Trigger a block from an address that you control.
3: Check the output of "iptables -L -v" to demonstrate that the address
is blocked.
4: Use "tcpdump -nn -i any host <address>" to watch traffic from that
address.
5: Send a command over the connection from step 1. tcpdump should show
packets in both directions, and your session should be usable, according
to the problem you described.
6: Check the output of "iptables -L -v" again and look at the counters
on each rule to see which rule is being matched.
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