Fedora Servers :: Unable To Restore My Iptables From Iptables-save After Upgrading

Nov 26, 2010

I am unable to restore my iptables from iptables-save after upgrading Fedora. I cannot get iptables-restore to work, and I have resorted to entering rules manually using the GUI.

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Fedora :: IPtables Creates An Error During Startup - Applying Firewall Rules: Iptables-restore: Line 21 Failed

Jul 17, 2010

IPtables creates an error during startup as well as when I try to restart it: Here's the output of:


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General :: Save Iptables When Iptables-save Doesn't Exist?

Apr 14, 2011

I'm working on a Soekris net4801 that is running an unknown distro of Linux. The kernel is 2.4.29, and iptables is v1.3.4.

I can't work out how to save the iptables. I searched the whole system for files/folders containing the name "iptables" and got 3 results:


I've tried iptables save, iptables-save and iptables save active.

"iptables save" and "iptables save active" give me an invalid argument error. "iptables-save" isn't a valid command. "iptables --help" gives me a list of valid switches, none of which have to do with saving.

how I can save the iptables?

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Ubuntu Servers :: Setup Iptables Rules In /etc/if-up.d/iptables?

Apr 16, 2011

I am running Ubuntu server 10.10 and trying to setup iptables rules in /etc/if-up.d/iptables

root@host# cat /etc/network/if-up.d/iptables
#!/bin/sh -e
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

Problem is that iptables doesn't get updated and I don't see them when iptables -L is executed after reboot.

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Fedora Networking :: IPTables Restore Script - Output Hangs

Jun 21, 2011

I have a config script for a particular software package that does...
iptables-restore < /etc/sysconfig/iptables > /tmp/firewall.log 2>&1
The problem is, the output hangs after this. If the user hits a return, the rest of the output comes to the screen and the script finishes normally. But the script looks like its hung because of this odd iptables-restore behavior.

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Ubuntu :: Iptables-restore Server Does Not Restore At Boot?

Jan 27, 2010

what could this bei saved my correct iptables file @ Code: /etc/iptables.up.ruleswhere webmin is looking for it.webmin config is to automaticly boot this file and addes a line at.



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Software :: Iptables-save Can't Save Settings?

Jan 29, 2009

Config a CentOS iptables.I issued some iptables rules.the rules were effective at once.Then, I came with a "iptables-save", but the "/etc/sysconfig/iptables" file hasn't been updated, it still loads the defaults rules with CentOS after reboot.

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Red Hat / Fedora :: Best Book For IPTABLES Contains Everything Of Iptables

Jun 18, 2011

I am going to start studying IPTABLES for Linux Firewall. Can any one suggest me the best Book for IPTABLES contains everything of iptables.

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Debian :: Iptables Cannot Save The Configuration?

Apr 28, 2011

I am configuring the iptables in the debain squeeze and then running the: iptables-save

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General :: When Restart The Iptables Service Then The Firewall Entries Are Again Shown In Iptables?

Sep 17, 2010

I am facing a strange problem witht my iptables as there are some firewall entries stored somewhere which is displaying the below firewall entries even after flushing the iptables & when I restart the iptables service then the firewall entries are again shown in my iptables as shown below,

[root@myhome ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination


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Ubuntu :: Try `iptables -h' Or 'iptables --help' For More Information - ' Not Found.4.4: Host/network `

Nov 3, 2010

I recently installed a new Ubuntu PC that runs iptables and PSAD. I had the same script on another Ubuntu PC, but when I copied the script onto the new PC, I got this error. I don't remember where I found the tutorial for this, all I know is that this is the script (Edited for my usage):


# Script to check important ports on remote webserver
# Copyright (c) 2009 blogama.org
# This script is licensed under GNU GPL version 2.0 or above


Safe.txt contains:


And the error message generated is:


root@NETWORK-SERVER:/var/ddosprotect# ./ipblock.sh
' not found.4.4: host/network `
Try `iptables -h' or 'iptables --help' for more information.
' not found.4.4: host/network `


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Fedora Servers :: Iptables NAT To Multiple Vlans?

Mar 26, 2009

I have eth0 for administration, and vlans eth0.2 eth0.3 and br0 for resource seperation. My esternal interface is ra0.each internal interface is on a seperate subnet, and I have dhcpd giving connecting devices ip addresses out of their assigned network. I want all of the devices to be able to access the internet through NAT, I need to allow them to communicate with port 80 on eth0's subnet



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Networking :: Iptables-restore Command Operates Atomically?

Oct 19, 2010

Anyone know if the iptables-restore command operates atomically? I want to make sure that the entirety of in-kernel iptables are switched over to those specified in the input to iptables-restore, all at once, with no intervening emptiness, incompleteness, or mixing with prior table. The man page doesn't say about this.

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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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Debian Configuration :: How To Restore Iptables To Default Installation Values

May 9, 2010

After resetting a pc running lenny I get iptables errors at boot ("resource temporarily unavailable", "bad rule" etc). "setting up firewall" (Guarddog) is not followed by any errors and the firewall apparently operates ok.How can I restore my iptables to the default installation values?

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Ubuntu Security :: Failing On The First Command When Run Iptables-restore < File Location

May 4, 2010

I'm setting up a server with Jaunty Jackalope version. I'm trying to test setting up a basic iptables rules... No matter which command I put in, it is failing on the first command when I run iptables-restore < file location (the first rule always fails). I'm doing this on the root user and first typing in the iptables rules in a test file. I've tried the first command starting with % sudo, iptables and -A. All have the same result. I've also tried letting the HTTP rule be first with the same result.


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General :: Unable To Start Iptables?

Feb 25, 2010

I am unable to start iptables :

-bash-3.2# /sbin/chkconfig --list | grep ip
iptables 0:off1:off2:on3:on4:on5:on6:off


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Software :: Iptables - Unable To Log To Rsyslogd

May 16, 2011

I am using iptables and what i want to do is have is log to a specific file that i have set for it. Here is what i edited to rsyslog.conf

#kern.* /dev/console
:msg, contains, "iptables" /var/log/iptables
& ~

now as far as iptables rules here is what i am working with...

iptables -A INPUT -i eth0 -p tcp --tcp-flags ALL NONE -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "iptables"

however when i run my script i get this kind of output:

iptables v1.4.9: unknown option `--log-level'

Try `iptables -h' or 'iptables --help' for more information. when i do 'iptables -L -n' i get this kind of output..

LOG tcp -- tcp flags:!0x17/0x02 state NEW limit: avg 5/min burst 7 LOG flags 0 level 4 prefix `iptables'

why i am getting this error unknown option '--log-level' and two why is not writing anything to /var/log/iptables when i do 'cat /var/log/iptables' i get nothing

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Ubuntu Servers :: Iptables Not Working In Xen VPS?

Jun 27, 2010

When I try to run anything that uses iptables, even just iptables -L, I get:


1+drm33.2/modules.dep: No such file or directory
iptables v1.4.4: can't initialize iptables table `filter': iptables who? (do you need to insmod?)

Perhaps iptables or your kernel needs to be upgraded. This is on a fresh Ubuntu minimal install, using my VPS hosts image (so they could have messed something up). I know there have been issues in the past with iptables on Ubuntu on xen. Is this a Ubuntu bug? Is there a solution?

incidentally depmod -a gives:


WARNING: Couldn't open directory /lib/modules/ No such file or directory
FATAL: Could not open /lib/modules/ for writing: No such file or directory

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Ubuntu Servers :: Ufw Or Iptables Script

Oct 4, 2010

I'm coming from a RHEL/CentOS background where I'm used to editing /etc/sysconfig/iptables for host-based firewall stuff. I can't find a direct equivalent on Ubuntu and I'm pretty surprised. What I've found is the ufw utility which seems to do some of what I want and some things I may not want, but it seems pretty cumbersome to type "ufw allow proto tcp from <address> to any port <number>" etc over and over again, compared to just copying and pasting and editing a largely canned set of iptables rules on RHEL.

Is that how experienced ubuntu server sysadmins do things? Do you really use the ufw front end, or do you do a preup script in /etc/network/interfaces that calls a iptables --restore, etc?

Is there another way that I'm missing? I want to do things the most standard, ubuntu-like way that's consistent with repeatability and quality, basically.

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Ubuntu Servers :: Setting Up NAT Firewall Using IPtables

Nov 30, 2010

I am having a little trouble setting up a NAT firewall using iptables. I have 1 PC dedicated to being the firewall running Ubuntu 10.04 LTS. There are 2 NICs in this PC. One NIC is connected to the modem & the other is hooked into my router, sharing the connection through to the other PC on my LAN. Thing is that I am having troubles setting this up using iptables. I have it sharing the connection, but can't seem to make it forward 2 ports through to my webserver on the LAN. I am also wanting to setup init.d to control iptables. I have been trying to google this, but haven't found anything useful to get this accomplished. I put the following into rc.local to make the forwarding work:

/sbin/iptables -F
/sbin/iptables -N block
/sbin/iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A block -m state --state NEW -i ! eth0 -j ACCEPT
/sbin/iptables -A block -j LOG
/sbin/iptables -A block -j DROP
/sbin/iptables -A INPUT -j block
/sbin/iptables --table nat -A POSTROUTING -o eth0 -j MASQUERADE

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Ubuntu Servers :: Iptables -L Spitting Out Ufw Information?

Jun 16, 2011

Though I have uninstalled and rm -rf'ed everything I can find having to do with ufw, I am still getting weird output from iptables -L If I type in

iptables -F
iptables -Z
iptables -L
I should get


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Ubuntu Servers :: Connection On Port 143 - Iptables Are Open?

Feb 2, 2010

I am configuring an internal only IMAP server for archival emails. I am absolutely baffled why my connection is being refused. UFW is disabled and IPTABLES has a rule to allow all connections on 143 and 993. When I telnet this response is given:

telnet localhost 143
telnet: Unable to connect to remote host: Connection refused
Even nmap shows the port closed. Here is my iptables rule:
HTML Code:
-A ufw-user-input -p udp -m udp --dport 143 -j ACCEPT

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Ubuntu Servers :: Find Port Names For Iptables?

Jun 4, 2010

I noticed you can use names for ports like ssh, instead of the actual port number in iptables, but I can't find a list of what they are?

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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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Ubuntu Servers :: Iptables Allow Ports To A Specific Ip Or Domain Name?

Jul 23, 2010

How to configure iptables to allow only 22,80,3306 ports for only a dynamic public ip/dyn dns domain name on a ubuntu server?

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Ubuntu Servers :: Ufw And Safe To Use Iptables Only For ICMP Rules?

Aug 5, 2010

In Lucid I have some ufw rules but I figured that I need to limit the ICMP messages that the box responds to and also limit their number. There are iptables rules to accomplish this but since I already have ufw rules it is safe to use iptables only for ICMP rules ?

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General :: Servers On Same Subnet / Same Iptables / Can't Access Webmin On One

Apr 8, 2010

Two servers, one is RHEL 4, and the other is RHEL 5. They are both on the same subnet, one is 10 the other is 11. I added the Webmin rule to the iptables config file but for some reason, the RHEL 4 server, I can access Webmin but the RHEL 5 server I can not. I checked the iptables file and they are the same for both servers, except two rules which are for other ports.

I'm reading about the iptables and had a problem when I manually added the port 10000 entry after the REJECT entry, but wondering if I need to move it up higher or maybe there's another possible block?

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Ubuntu Servers :: Using Basic Iptables Config - But ALL Traffic DROPS

Jan 11, 2010

I'm using Ubuntu server 9.10 with 2 NICS (Internet-router-eth0, eth1-LAN). I use iptables to generate rules for 20 computers, but when I execute the script, ALL TRAFFIC DROPS, including the server. What am I doing wrong?

#eth0 - connected to Internet
#eth1 - connected to LAN
# - workstation1
#set default policies
iptables -P INPUT DROP


iptables -A FORWARD -i eth1 -o eth0 -p tcp --dport 80 -s -j ACCEPT. The reason I'm doing this is, I just want to open necessary ports in the server and restrict LAN usage.

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Ubuntu Servers :: Iptables Causing Slow Ssh And Name Lookup Errors

Jan 24, 2010

Why would this iptables cause this mail delivery error? I think it's to do with dns lookups not being routed properly... if remove the last rule, mail works fine.

ssh is also very slow to connect when the last rule is enabled.

postfix mail error:

Jan 24 11:32:18 xxxx postfix/smtp[15065]: 9F2162C519: to=<xxxxx@hotmail.com>, relay=none, delay=1005, delays=965/0.01/40/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=hotmail.com type=MX: Host not found, try again) iptables


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