Iptables: how do I LOG what's not being ACCEPTED and limit what gets logged?

Posted by Kris on Server Fault See other posts from Server Fault or by Kris
Published on 2012-03-25T21:26:36Z Indexed on 2012/03/25 23:32 UTC
Read the original article Hit count: 235

Filed under:

iptables

|

logging

|

limit

How do I log what's not being accepted by the following rule:

iptables -A OUTPUT -p icmp --icmp-type 3 -m -limit --limit 10/minute -j ACCEPT

And how do I limit what's being logged because I don't want to log 1000s of pings?

My first thought was:

iptables -A OUTPUT -p icmp --icmp-type 3 -m -limit --limit 50/day -j LOG
iptables -A OUTPUT -p icmp --icmp-type 3 -m -limit --limit 10/minute -j ACCEPT

But that doesn't seem right to me.
I think this limits the logging to 50/day but not necessarily what is not being accepted, or am I wrong?

© Server Fault or respective owner

Related posts about iptables

Sometimes this script fails to update the iptables

as seen on Server Fault - Search for 'Server Fault'
It does not happen often, but sometimes after running the below script, checking the iptables with service iptables status shows that they weren't updated and the script doesn't output any error. The iptables is structured as look-up tree (long repeated sections snipped): #!/bin/sh iptables -t… >>> More
My current iptable configuration doesn't work [on hold]

as seen on Server Fault - Search for 'Server Fault'
sudo chkconfig iptables off /etc/init.d/iptables on ### Clear/flush iptables sudo iptables -F sudo iptables -P INPUT ACCEPT sudo iptables -P OUTPUT ACCEPT sudo iptables -P FORWARD ACCEPT ### Allow SSH iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables… >>> More
L2TP iptables port forward

as seen on Server Fault - Search for 'Server Fault'
Hi all, I'm setting up port forwarding for an L2TP VPN connection to the local Windows 2003 VPN server. The router is a simpel Debian machine with iptables. The VPN server works perfect. But I cannot log in from the WAN. I'm missing something. The VPN server is using a pre-shared key (L2TP) and… >>> More
iptables -P FORWARD DROP makes port forwarding slow

as seen on Server Fault - Search for 'Server Fault'
I have three computers, linked like this: box1 (ubuntu) box2 router & gateway (debian) box3 (opensuse) [10.0.1.1] ---- [10.0.1.18,10.0.2.18,10.0.3.18] ---- [10.0.3.15] | box4, www [10.0.2.1] Among other… >>> More
IPtables AWS EC2 NAT/Reverse NAT - For Reverse Proxy style setup but with IPtables

as seen on Server Fault - Search for 'Server Fault'
I was thinking initially needing to do a reverse proxy or something so I could get some SSL/TLS traffic look like it is being terminated at a server and IP address in the AWS cloud, and then that traffic is forwarded onto our actual web servers that aren't in the cloud... I've not done much iptables… >>> More

Related posts about logging

log file is not getting created using JDK logging with Commons-logging

as seen on Stack Overflow - Search for 'Stack Overflow'
When I run the TestJcLLoggingService class log messages are coming to Console but no log file is created, please help me if you know the answer. two source files are pasted below. TestJcLLoggingService.java package com.amadeus.psp.pasd.logging; import org.apache.commons.logging.Log; import org… >>> More
Python logging before you run logging.basicConfig?

as seen on Stack Overflow - Search for 'Stack Overflow'
It appears that if you invoke logging.info() BEFORE you run logging.basicConfig, the logging.basicConfig call doesn't have any effect. In fact, no logging occurs. Where is this behavior documented? I don't really understand. >>> More
Python: combine logging and wx so that logging stream is redirectet to stdout/stderr frame

as seen on Stack Overflow - Search for 'Stack Overflow'
Here's the thing: I'm trying to combine the logging module with wx.App()'s redirect feature. My intention is to log to a file AND to stderr. But I want stderr/stdout redirected to a separate frame as is the feature of wx.App. My test code: import logging import wx class MyFrame(wx.Frame): … >>> More
Redirect logging output using custom logging handler

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi Guys, I'm using a module in my python app that writes a lot a of messages using the logging module. Initially I was using this in a console application and it was pretty easy to get the logging output to display on the console using a console handler. Now I've developed a GUI version of my app… >>> More
Java Logger API

as seen on Oracle Blogs - Search for 'Oracle Blogs'
This is a more like a tip rather than technical write up and serves as a quick intro for newbies. The logger API helps to diagnose application level or JDK level issues at runtime. There are 7 levels which decide the detailing in logging (SEVERE, WARNING, INFO, CONFIG, FINE, FINER, FINEST)… >>> More