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Full Discussion: Nat and packet limits with iptables
Special Forums IP Networking Nat and packet limits with iptables Post 302835173 by ahmerin on Monday 22nd of July 2013 04:16:35 AM
Old 07-22-2013
Nat and packet limits with iptables
Hi all,

I have a following situation:

- I want certain source IPs to be natted to a different destination IP and Port. Following is how I am achieving it:

Code:
/usr/local/sbin/iptables -t nat -A PREROUTING -p tcp -s 192.168.10.12
  --dport 1500 -j DNAT --to-destination 192.168.10.20:2000

Above runs on 192.168.10.12 and is working perfectly fine.

- Now, I want that if there are more than, say 20 packets per minute from source IP then further packets should be dropped.

Above is what I am having difficulty to achieve.


I have done the following but is not working:
Code:
/usr/local/sbin/iptables -t nat -A PREROUTING -p tcp -s 192.168.10.12 
  --dport 1500 -m limit --limit 20/m --limit-burst 5 -j DNAT --to-destination 192.168.10.20:2000

/usr/local/sbin/iptables -t nat -A PREROUTING -p tcp -s 192.168.10.12
  --dport 1500 -j LOG --log-level 4 --log-prefix "192.168.10.12 Packet Limit exceeded: "

/usr/local/sbin/iptables -A INPUT -p tcp -s 192.168.10.12 --dport 1500 -j DROP

Can someone help me get the correct statement or confirm whether I can achieve the above requirement through IP tables.

Many thanks for your help.

Regards
Ahmerin

---------- Post updated at 08:16 AM ---------- Previous update was at 06:44 AM ----------

Sorry... My mistake... the following IPtables command runs perfectly fine on the server where source actualy goes to first. It is not running on 192.168.10.12:

Code:
/usr/local/sbin/iptables -t nat -A PREROUTING -p tcp -s 192.168.10.12
  --dport 1500 -j DNAT --to-destination 192.168.10.20:2000

Last edited by Scott; 07-25-2013 at 09:24 AM.. Reason: Code tags
 

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LEARN ABOUT DEBIAN

tgt-setup-lun

tgt-setup-lun(8)					      System Manager's Manual						  tgt-setup-lun(8)

NAME

       tgt-setup-lun - creates a target, adds a device to the target and defines initiators that can connect to the target

SYNOPSIS

       tgt-setup-lun -d device -n target_name [initiator_IP1 initiator_IP2 ...] [-h]

DESCRIPTION

       Starts tgtd if necessary and creates a target according to the supplied target_name. The format of the target name is as follows:
       iqn.2001-04.com.<hostname>-<target_name> The target name must be unique.

       The  script then adds the requested device to the target. If specific IP addresses are defined, it adds them to the list of allowed initia-
       tors for that target. If no IP addresses is defined, it defines that the target accepts any initiator.

EXAMPLES

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81 and 192.168.10.82:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81 192.168.10.82

       Create a target that uses /dev/sdb1 and allows connections from any initiator:
       tgt-setup-lun -d /dev/sdb1 -n my_target

       Display help:
       tgt-setup-lun -h

AUTHOR

       Written by Erez Zilber

REPORTING BUGS

       Report bugs to <stgt@vger.kernel.org>

COPYRIGHT

       Copyright (C) Voltaire Ltd. 2008.

																  tgt-setup-lun(8)
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