CentOS 5 Networking :: Iptables Not Loading Some Modules?

Jan 23, 2010

The problem I am having is that iptables won't load the required modules for my firewall rules.

iptables -F
iptables -P INPUT DROP
iptables -P FORWARD DROP


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General :: Rc.modules Not Loading Modules At Startup?

May 11, 2010

I've been trying to load my pcmcia network card driver "xirc2ps_cs" at startup with no success. I have added "modprobe xirc2ps_cs" to the rc.modules file but it doesn't load at startup. Curiously, though, if I execute rc.modules AFTER the machine has booted it will load the modules just fine. Just not during the boot up process. Thinking that hotstart might have been causing problems I've disabled hotstart (chmod -x) temporarilly to remove it from the picture, but there was no change.

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Ubuntu Networking :: Modules Not Loading At Boot-time?

Sep 1, 2011

I've recently been having a lot of trouble trying to install a ralink 3062 driver on my ubuntu 11.04 desktop. There are quite a few excellent tutorials on this website. [URL]... In my case, however, adding the conflicting drivers to /etc/modprobe.d/blacklist.conf didn't prevent them being loaded at boot-time, so I could not make the change permanent. I eventually found a workaround online which I thought I'd share here. Once you have updated your blacklist and module list, use Quote:

sudo update-initramfs -u

I'm a beginner so I'm not sure, but I think the problem is that initramfs loads the conflicting modules into memory before the system comes to reading the blacklist and module files. Once you've done this, restart your system and you shouldn't have any further problems. P.s. As far as I know this only works (but should only be a problem for kernel 2.6 and later)

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Software :: Iptables Modules Are Not Listed With Lsmod

Jan 20, 2011

I was putting together my iptables rules based on "LINUX FIRE WALLS Attack Detection and Response with iptables, psad, and fwsnort" by Michel Rash.Based on the above, are the naming conventions used for netfilter modules changed? If so, could someone point in the right direction to get the facts from. I am worried that I am not getting the modules loaded to match the rules in my firewall. I was also trying to set up string matching and noticed that some things have changed. Perhaps I need to read a more updated book on iptables / netfilter.

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Ubuntu :: Prevent Modules From Loading?

May 21, 2011

I am running 11.04 and would like to stop the loading of the parport and lp modules. I put entries in the /etc/modprobe.d/blacklist.conf file and ran update-initramfs -u. After a reboot lsmod shows both modules as being loaded.

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Server :: Debian 5.0.6 Iptables Modules Installation - VMware

Mar 2, 2011

I use Debian 5.0.6 32-bit through VMware workstation installed on my Windows Server 2003. I just simply installed it from CD-1 and I use Directadmin on that.

I need a lot of iptables commands for blocking but I keep getting missing module errors on that one, I did lsmod | grep -i iptables to see there are no modules. It should have been installed by the disc image but I don't know why it didn't. So I now want to know how to get those modules required by iptables.

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Debian Configuration :: Loading Modules At Boot?

Aug 29, 2010

I have to load the ip_conntrack modules every time I reboot. How do I get the iptables modules to load automatically at boot. It seems they are supposed to auto load when they are needed but they are not doing that. I have to do modprobe on them. also does anyone know where I can download all the modules available for iptables? I looked on the netfiler site and did not learn much.

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Ubuntu :: Stop The Loading Of The Parport And Lp Modules?

May 21, 2011

I am running 11.04 and would like to stop the loading of the parport and lp modules. I put entries in the /etc/modprobe.d/blacklist.conf file and ran update-initramfs -u. After a reboot lsmod shows both modules as being loaded.

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Slackware :: 13.37 Isn't Loading The Modules - CPU Frequency Scaling ?

Jun 10, 2011

For some reason, it seems that 13.37 isn't loading the modules I need for cpu frequency scaling. I've edited /etc/rc.d/rc.modules so that CPUFREQ is set to on. On 13.1, this would mean the powernow-k8 module would be loaded for my AMD cpu, and the subsequent "ondemand" governor would be loaded. However, for some reason this isn't being done during the boot process. I've tried it using both the generic kernel and the huge kernel (I'd been using huge for a long time before without realizing it.) Has anything changed in 13.37 with regards to CPU frequency scaling?

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Fedora :: Loading Modules To Work With Card Reader Using F13?

Aug 7, 2010

I found a solution to my card reader problem in a another fedora post but when I type the code in terminal I get:
all config files need.conf /etc/modprobe.d/blacklist
How to write this code so I wont get this error and I can load these modules and also how to edit the modprobe.conf.

The code is below, using fedora 13.
You must load these two modules to work with card reader.
First : Remove the card from the Reader!
AS superuser type in console :
1. /sbin/modprobe tifm_core <enter>
2. /sbin/modprobe tifm_sd <enter>

If you want to automate these modules loading do the following :
edit the /etc/modprobe.conf file
add these :
alias mmc_core tifm_core
alias mmc_card tifm_sd

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CentOS 5 Networking :: Iptables U32 Does Not Work

Apr 7, 2010

When I try something like, I get:

iptables -A FORWARD -p udp -m length --length 39 -m u32 --u32 '27&0x8f=7' --u32 '31=0x527c4833' -j DROP
iptables: No chain/target/match by that name.

So I re-compiled the kernel enabling WAN Router, and all the subsections. Downloaded latest iptables, removed the RPM one, installed the iptables from source.. Guess what, same error!

PS: iptables -m u32 -h works, it displays a page of info.

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CentOS 5 Networking :: Iptables Empty After Reboot?

Aug 5, 2009

I have a strange problem with IpTables.after a server reboot, the complete rule-list of iptables is empty. After a manually start, all my old rules are there again.I checked chkconfig if autostart of iptables is enabled:chkconfig --list iptablesiptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off

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CentOS 5 Networking :: Firewall Insanity Iptables And Apf Don't Seem To Like Each Other?

Aug 13, 2009

I'm at my wits end at this point.

CentOS 5
APF 9.7
Webmin 1.4.80 (yes i can be a gui noob at times)

I'm currently running a dedicated server that hosts a couple of sites and runs a game server or two. I was using iptables on its own for a while, but recently I'm a target of all sorts of attacks (typically aimed directly at the gameserver on port 7777. UDP flood attacks, etc). I'm also seeing an spike in foreign spam, SSH brutes, and a few people in Turkey thought it would be cute to download files over and over and over I have decided to start banning entire countries, using the subnets listed here [URL]... I'm trying to block Central and South america (189,190,200,201.x.x.x), China, Ukraine, Turkey, Iran, Spain and Italy. I do this because a majority of the traffic from those areas are usually up to no good.

I installed APF so I could easily add these ranges in deny_hosts.rules and be done with it. I added the ranges, which turned out to be too many, and the system tanked. I decreased the amount of ranges to just 4:

Restarted APF and it loaded fine. Do an apf --list and iptables --list and it shows those 4 ranges as blocked. The only issue...I have people from 190.x and 200.x connecting to the gameserver and PLAYING. Its as if the firewall isnt there. Also, adding those ranges to /etc/hosts.deny (or whatever) doesn't block them either.

I add one of my own ips and I get blocked instantly. WTF?? I look in the iptables for webmin, and it shows an empty firewall. I do iptables --list and it shows the ranges I added in APF. I'm looking at building (or whatever its called) an fresh iptables with the geoip module added in. [URL]...

I've never done anything like this, and I don't want to kill the box. I also don't want to spend the effort if 1) something is wrong with my system to begin with and 2) the geoip module doesn't work. geoip module aside....how exactly should i configure the firewall? Empty iptables completely and then rely on APF for everything? Oh and heres another tidbit: I tried this before 2 years ago and it used to be that anything I put in APF would show when i looked at iptables using the webmin module. Thats no longer the case now. That was also on CentOS 4 when it did that. I don't know if moving to 5 is whats preventing it now.

In a nutshell, I'm new at this and I'm being inundated with terrible people trying to do terrible things and I'm ready to just give up. Can someone just give me a quick rundown on:

1) how to test that my firewall is actually firewalling

2) how I should configure the/a firewall on this CentOS5. Not too specific, I just want to know if I should empty iptables then load apf, should i not bother with APF (i like it when it works), is there a specific order of doing things?

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CentOS 5 Networking :: Iptables For Transparent Proxy?

Mar 11, 2010

I have big problem with correct settings of iptables as a router. My network topology (UTM Hardware router)>eth0 with apache ftp and transparent squid 8080)--->eth1 with dhcp)


I have problem with hanging connections through squid which are very slow or connection failed. Sometimes i received DNS timeout error from squid stable 2.6 21


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CentOS 5 Networking :: Error When Redirect Through Iptables?

Mar 30, 2010

I'm trying to redirect the requests from port 80 to ports 8080 and 8081 through iptables because I've got two services which need accept requests from the same port(80):

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080-8081

The problem is that the second port (8081) never gets a request, just the first one.

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CentOS 5 Networking :: Adding Iptables -F To Boot?

Sep 5, 2010

How I add this " iptables -F " to my Servers boot I already asked this from my Provider, but it seams he forget each time I ask.

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CentOS 5 Networking :: Large Iptables Rule Set?

Jan 10, 2011

Loaded up Centos 5.5 final. Configured iptables to block regions of the world based on networks. An example would be:


My /etc/sysconfig/iptables file contains about 10k entries like this. If I use this, the machine lags hardcore network wise.

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CentOS 5 Networking :: Iptables DOS Temporarily Block IP?

May 5, 2011

I have the requirement that if our website receives 20 or more requests within 60 seconds, to block the offending IP address for 5 minutes, then allow them access again. My only certain mechanism to do this is iptables. I wrote the following series of commands:

iptables -N RATE_CHECK
iptables -N DOSAttack
iptables -N RemoveBlock


I am limited in my testing, but the little I have been able to test seems to be having no effect. will the above commands have the desired effect.

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CentOS 5 :: Custom Iptables: Remove The Existing Iptables First?

Apr 28, 2009

To expand: I'm trying to set up a box with l7-filter, and I need to patch and compile iptables as part of the process. I ./configured it with the prefix= argument so it would install into /sbin instead of /usr/sbin, and I did a yum remove iptables before installing it so as not to get in the way of the original iptables, but I'm wondering if this is really necessary - it's kind of annoying, because removing the original iptables removes the init.d script, deregisters the service, etc. If I don't, is it possible that iptables might get overwritten in a system update or something, or will yum see that I've got a custom/newer version in there and leave it be?

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CentOS 5 Networking :: IPTables Service Failed To Start

May 9, 2009

I have CentOS 5.2 just installed and massively updated with yum -update command. Than I tried to configure firewall. After changes via system_config_securitylevel_tui (open ssh, http, ftp, and 3306:TCP ports) iptables service can't start with message

> /sbin/service iptables start
Flushing firewall rules: [OK]
Setting chains to policy ACCEPT: mangle filter nat [OK]
Unloading iptables modules: [OK]
Applying iptables firewall rules: iptables-restore v1.3.5: Couldn't load match `TCP':/lib64/iptables/libipt_TCP.so: cannot open shared object file: No such file or directory
Error occurred at line: 18
Try `iptables-restore -h' or 'iptables-restore --help' for more information.

I erased the iptables service and installed it again with yum. How can I make this service work?

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CentOS 5 Networking :: View The Packets Saved By Iptables?

Jun 26, 2009

if am using --log-prefix "BANDWIDTH_OUT:" --log-level 7 to capture packets, I think is there a way to view these?

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CentOS 5 Networking :: IPtables Module Load Fail

Apr 10, 2010

I'm encountering a known problem with IPtables. I set up rules and apply them, restarting firewall, then I get this message:

Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: raw nat mangle filter [ OK ]
Applying iptables firewall rules: [ OK ]
Loading iptables additional modules: ip_conntrack_ftp ip_conntrack_netbios_ns [FAILED]

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General :: No Websites Loading Using Iptables Nat

Sep 18, 2010

I'm using a 3G modem whilst o2 transfer over adsl. trouble is no websites load but I can resolve domains. I enabled masquerade on the PPP0 ( modem) interface. added the server as default route for all workstations.

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
net.ipv4.ip_forward = 1″ to /etc/sysctl.conf

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CentOS 5 Networking :: IPTABLES - Should This Rule Take Care Of Port 5090?

Jun 6, 2010

I am new to iptables. The setup tool on a VPS doesn't work. So, I am learning to insert rules. I have inserted so many and some of them show as duplicates now.

1- I want to know how to remove the duplicates. Is there a file that these rules are store in so I can go in and easily edit it?

2- Is there any other utility that handles firewall in Linux that I am unaware of? or is the iptables the ultimate door guard? This is a plain install of CentOS.

3- Since I believe I opened port 5090 but I think it still might be blocked, could SELINUX be the problem? How can I get my way around setting it to permissive or disable if I don't have access to "setup" command?

4- What is the order of iptables reading? does rule #1 supersede all other rules? or does the last rule supersede all rules prior to it?

5- Do the rules below make a fairly safe system? (except for the duplicates which should be remove) I understand that a safe system is dependent also on the applications that are allowed in this category and I am not talking about those. I am talking about dropping all other inquiries and in general is this how iptables are setup? This is what I currently have:

[root@tel ~]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination


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CentOS 5 Networking :: Slow When Connecting To The Web (e.g. Page Loading)?

Jul 6, 2009

When running Firefox, page loading is very slow (e.g. taking nearly a minute for a ..... video to start; even gmail is slow). This is in contrast with my performance when using, e.g. linuxdcpp (file sharing), where I get speeds over 300kbps. Here is some relevant information:

[root@cgwatson ~]$ uname -rmi
2.6.18-128.el5 x86_64 x86_64
[root@cgwatson ~]$ rpm -q centos-release

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CentOS 5 Networking :: Configure - Set Iptables On Server 1 - To Acces Webserver From Other City

Jan 13, 2010

I am using centos 5.3 , and also using webserver in local network

Here is all configuration

1, server

eth0 , this is live ip

2, webserver


I want set iptables on server 1 , to acces webserver from other city ,

How to configure iptables

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CentOS 5 Networking :: Iptables Not Opening Port To Connect Via Vnc To A Server Running 5.5?

Apr 27, 2011

I'm trying to open up some ports to connect via vnc to a server running Centos 5.5. I've edited /etc/sysconfig/iptables everything *looks* fine, but I still can't seem to get access to the port I've opened (I added some newlines for clarity between commands):


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Debian Configuration :: Lenny Not Loading Iptables Rules

Dec 30, 2010

I'm having some trouble with the configuration of the iptables. I want to setup a network server to serve as Fail Over (for my 2 ISPs), DHCP and DNS. I have 3 network cards, 2 connected to ISP's routers and 1 that serves as UPLINK for my switch.

I want to add some Iptables rules so I can achieve what I want to do. The problem is that the rules I try to use, they have to effect.... they don't load, here are the rules I am trying to add:

#iptables --table nat --append POSTROUTING --out-interface eth1 -j MASQUERADE
#iptables --table nat --append POSTROUTING --out-interface eth2 -j MASQUERADE
#iptables --table nat --append POSTROUTING --out-interface eth2 -j SNAT --to EXTIP

When I try to check to see if it loads, with the command:

#iptables -L

It returns empty

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Ubuntu Servers :: Iptables Rules Loading On Boot?

Jun 22, 2010

I have a clean install of Ubuntu server Lucid Lynx with the virt-host task installed. I need to find the location of the iptables rules that are being loaded when the system boots. These are the rules for the virbr0 interface.

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Fedora :: 14 Shutdown Hangs At "iptables Unloading Modules"?

Jan 20, 2011

About 1 shutdown in 3, my PC just hangs and doesn't actually power off. If I hit "escape" early enough during this, the last output is "iptables unloading modules", and nothing else changes. Wait long enough and hitting escape will not do anything, but still computer does not shutdown

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