recent v1.2.11 options:
[!] --set Add source address to list, always matches.
[!] --rcheck Match if source address in list.
[!] --update Match if source address in list, also update last-seen time.
[!] --remove Match if source address in list, also removes that address from list.
--seconds seconds For check and update commands above.
Specifies that the match will only occur if source address last seen within
the last 'seconds' seconds.
--hitcount hits For check and update commands above.
Specifies that the match will only occur if source address seen hits times.
May be used in conjunction with the seconds option.
--rttl For check and update commands above.
Specifies that the match will only occur if the source address and the TTL
match between this packet and the one which was set.
Useful if you have problems with people spoofing their source address in order
to DoS you via this module.
--name name Name of the recent list to be used. DEFAULT used if none given.
--rsource Match/Save the source address of each packet in the recent list table (default).
--rdest Match/Save the destination address of each packet in the recent list table.
ipt_recent v0.3.1: Stephen Frost .
recent
Allows you to dynamically create a list of IP addresses and then match against that list in a few different
ways.
For example, you can create a `badguy' list out of people attempting to connect to port 139 on your firewall
and then DROP all future packets from them without considering them.
--name name
Specify the list to use for the commands. If no name is given then 'DEFAULT' will be used.
[!] --set
This will add the source address of the packet to the list. If the source address is already in the
list, this will update the existing entry. This will always return success (or failure if `!' is passed
in).
[!] --rcheck
Check if the source address of the packet is currently in the list.
[!] --update
Like --rcheck, except it will update the "last seen" timestamp if it matches.
[!] --remove
Check if the source address of the packet is currently in the list and if so that address will be
removed from the list and the rule will return true. If the address is not found, false is returned.
[!] --seconds seconds
This option must be used in conjunction with one of --rcheck or --update. When used, this will narrow
the match to only happen when the address is in the list and was seen within the last given number of
seconds.
[!] --hitcount hits
This option must be used in conjunction with one of --rcheck or --update. When used, this will narrow
the match to only happen when the address is in the list and packets had been received greater than or
equal to the given value. This option may be used along with --seconds to create an even narrower match
requiring a certain number of hits within a specific time frame.
--rttl This option must be used in conjunction with one of --rcheck or --update. When used, this will narrow
the match to only happen when the address is in the list and the TTL of the current packet matches that
of the packet which hit the --set rule. This may be useful if you have problems with people faking their
source address in order to DoS you via this module by disallowing others access to your site by sending
bogus packets to you.
解决具体问题：限制 ssh 猜密码，对每个 IP 允许三分钟内允许有 5 次 TCP 的 NEW 请求
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --name ROUTER-SSH --update --seconds 180 --hitcount 10 -j REJECT --reject-with tcp-reset
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --name ROUTER-SSH --set -j ACCEPT
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