Flushing Iptables/remove Rules
Jul 1, 2009
I have a VPS (Virtuozzo) with cPanel installed. I notice that iptables running in the VPS had many DROP rules when I listed using iptables -nL command. So I flushed iptabled using "iptables -F" command and also "> /etc/sysconfig/iptables" command and restarted iptabled. When I try to list the rules it would show empty. However when I try to list after a few minutes it is showing the same old rules with many DROP rules yet again! Is there anyway to remove the rules completely?
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Sep 16, 2007
I keep trying to flush my iptables on my linux server but every time i try to do so my server seems to freeze (i lose access and have to reboot it for it to come back online), how can I go about deleting those ips manually rather than executing the flushing command? what options do I have?
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Jul 2, 2009
One of my low knowledge area's is Iptables Rule's I just normally use APF/CSF.
However on a VPS Host node, I basically want to block all access to a certain port let's say 1234 apart from a certain IP address.
However I don't want to block this port on any of the VPS's on the Node, so what Iptable Rule(s) would I need to put into a bash script on startup.
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May 15, 2007
I had csf firewall installed, and due to my own stupidity, attempted to login with the wrong password one too many times, which added my IP to iptables, locking me out. I had to SSH into a linux box at school, and then ssh into my server to stop the iptables service so I could get into my server.
I removed every trace of my IP that I could find in csf, but sometime in the middle of the night, iptables reloads some rules from somewhere that blocks me again. I also tried doing iptables -F to clear all rules, but again, sometime in the middle of the night, rules are reloaded and I get blocked. I even uninstalled csf to no avail. I just want to remove my IP once and for all.
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May 18, 2008
my server have problem with login to ftp
i ask of cpanel,cpanel answer :
Howdy,
Are you using any kind of external firewalling? I have enabled the passive
ports in pure-ftpd and attempted to connect in passive mode, but it still
fails.
and
Howdy,
You should allow connections on 30000 through 50000 for passive ftp
---
this is vps
how may i solved it?
i use of csf
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Jul 19, 2008
I use APF and APF is working with iptables , when I define a large number of IPs in deny_hosts.rules or allow_hosts.rules and restart the APF , iptables begins to display errors after applying some number of rules , I have set SET_TRIM="0" in APF , so the number of APF rules is unlimited and the error is from iptables.
Is there any setting in iptables config files for maximum number of rules?
Is it unlimited and depends only on system available memory? O/S , ...?
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May 6, 2009
If I buy a web server (Linux), Do I need to use iptables and create some security rules?
What types of rules?
Is it suggest use modsecurity for Apache?
If I host 2 sites (2 wordpress blog), what are better rules?
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Oct 4, 2007
One of these rules is causing name server lookups to fail, but I can't seem to figure out which one, can anyone spot the problem?
Code:
[root@example ~]# iptables -L -n
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
INVDROP all -- 0.0.0.0/0 0.0.0.0/0 state INVALID
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x00
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x3F
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x03/0x03
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x06
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x05/0x05
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x11/0x01
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x18/0x08
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x30/0x20
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:110
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:143
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:443
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:465
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:953
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:993
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:995
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:10023
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:20
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:21
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:953
ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 state NEW icmp type 8
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpts:1024:65535
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpts:1024:65535
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spts:1024:65535 dpt:53
LOGDROPIN all -- 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy DROP)
target prot opt source destination
Chain OUTPUT (policy DROP)
target prot opt source destination
INVDROP all -- 0.0.0.0/0 0.0.0.0/0 state INVALID
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x00
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x3F
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x03/0x03
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x06
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x05/0x05
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x11/0x01
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x18/0x08
INVDROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x30/0x20
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:110
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:113
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:443
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:953
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:10023
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:9999
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:20
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:21
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:113
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:123
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:953
ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 state NEW icmp type 8
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpt:53
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spts:1024:65535 dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpts:1024:65535
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpts:1024:65535
LOGDROPOUT all -- 0.0.0.0/0 0.0.0.0/0
Chain INVDROP (18 references)
target prot opt source destination
DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain LOGDROPIN (1 references)
target prot opt source destination
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:67
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:67
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:68
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:68
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:111
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:111
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:113
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:113
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:135:139
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:135:139
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:445
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:445
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:513
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:513
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:520
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:520
LOG tcp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *TCP_IN Blocked* '
LOG udp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *UDP_IN Blocked* '
LOG icmp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *ICMP_IN Blocked* '
DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain LOGDROPOUT (1 references)
target prot opt source destination
LOG tcp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *TCP_OUT Blocked* '
LOG udp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *UDP_OUT Blocked* '
LOG icmp -- 0.0.0.0/0 0.0.0.0/0 limit: avg 30/min burst 5 LOG flags 0 level 4 prefix `Firewall: *ICMP_OUT Blocked* '
DROP all -- 0.0.0.0/0 0.0.0.0/0
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May 24, 2008
it looks likely certain ip is ban by the iptables,
i want to ask how can i check what the ips are ban by the iptables?
and how can i remove the ip which is deny on the iptables?
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Aug 2, 2007
was wondering whether you thought it would be a good idea to flush my /tmp folder on a daily basis (rm -rf /tmp/*).
Do you think this would cause more issues than solutions? Seems my server could have potentially had some scripts in the /tmp that brought it down this morning...
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Jul 22, 2009
ive got a site which auto creates subdomains and installs a script automaticly and inserts details into a mysql db. i have had some issues recent so have loads (talking 100s) of folders that are empty which i need to remove, and to remove the details of said folder from db also. any ideas how i can do this, using plesk control panel so removing the subdomain via plesk cli may be the best way in that respect but the db is external to plesk so that would not be edited
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Jan 5, 2008
I execute the following commands, in the following order:
iptables --flush
iptables --zero
iptables -A INPUT -s 218.65.12.161 -j DROP
will that last command successfully ban that IP until reboot?
If not, what needs to be done? I can't access my site if I don't flush + zero iptables first but I need to be able to ban with iptables.
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Aug 9, 2006
I signed up with Lunarpages a while back for a dedicated server for my business. Good price, managed hosting rocks, decent disk space... little problem once with a huge power outage, but **** happens, cool.
All is well until I wake up this morning to an email a minute about a failed cron job. It smells fishy, so I contact LUnar pages support to see whats up.
They inform me that some asswad had managed to brute force into my server using a temporary account I set up a while back for some tech support. (I prefaced this with 'im an idiot', so no you know why)
Either way, my server now has a rootkit, plus other **** im sure im not aware of... so they propose to move me to a brand new fresh box. im thinking they are gonna charge me a fee for this, a fee for that... no way. All is free of charge.
Im ****ting kittens now.
so im resetting everything up, and i manage to look myself out of my database...(i told you I was an idiot.. and this was a looooong day already)
they fix it. again. no problem...
If you are looking for a dedicated server, go to lunarpages. otherwise you are a freaking idiot as far as I am concerned...
Lunarpages, I love you, I want your babies...
PS: I am in no way affiliated with lunarpages... however, if they want to give me a free year on their servers, i wouldnt complain... *hint hint*
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May 25, 2009
Is it possible to disable a particular mod_security rule for particular directory or the rules are global?
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May 26, 2009
I want to block the icmp6 and traceroute on my ipv6 server,how can i do it?
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Aug 15, 2008
I just installed mod_security via WHM, and want to know what rule should I enter to prevent some URLs from being opened.
For example, if URL contains word "abc" (like domain.com/some_folder/abc/file.php), it should not be opened.
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Jun 4, 2008
how to set the rules of MOD_Security.
Another question for professionals:
Q: What are the best rules to secure my server? I'd appreciate if you managed to attach these rules to your replies. // FYI, I host VBulletin portals.
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Feb 25, 2008
make this rules work on apache 2 mod_security 2?
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Dec 17, 2008
Any good secure rules for mod_security 2 that work well for shared servers?
Can someone share what rules you are using to secure your shared servers. Have tried a few different sets of rules, but a few customers always end up with errors and disabling it for their domain name doesn't sound like a safer option for them or the server.
Share your mod_sec 2 rules.
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Mar 15, 2008
i have server windows 2003.
ISS 6.
PHP 5.x
MySQL 5.0
how to create rules with ip/5hit/s is black list and auto ban ip with IPSec.
when test attack file .php
info test :
using code attack files.
attack file test.php ( code files : <?php echo "we are test" ; ?> )
Ex : attack files test.php ( http://mydomain.php/test.php )
attack 200hit/s ( all files .php is not run ) php application is hang.
also wherewith code attack. i tested asp, html. it isn't problem. ( 1879hit/s ) ( good working)
how to create rules ban ip with 5hit/s?
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May 10, 2008
Is there any difference with the old one?
I have a customized modsecurity.conf file in my old Apache 1.3 server. Is it ok to copy it to new modsec2.conf?
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Nov 28, 2007
I'v just upgraded to apache2.2 and modsecurity2
there is a difference between modsec1 and 2 rules
so i can't use modsecurity1 rules
so can i have rules for modsecurity2
and can you tell me how do i create a new rules
in modsecuirty1 i just do this :
Code:
SecFilter "cmd"
in modsecurity2 i triad:
Code:
SecRule "cmd"
but it didn't work
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Apr 15, 2007
How do I set up rewrite on lighttpd?
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Nov 15, 2007
I got on one of my dedi server apf firewall installed and it keep reseting every 24 hours?
i put the devile mode to 0.
i have cpanel 11 and centos 4 runing
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Apr 1, 2007
Does anyone know any good mod_evasive rules that pick up DoS, but not many false positives? Just looking to see what works for everyone out there, been having trouble.
Or if there is better apache module to combat DoS.
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Aug 2, 2007
I really want to know some importent mod_security rules that can come in handy to avoide hackers
I am using apache1
any good rules will do just fine
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Nov 6, 2009
We were recently hacked on our dedicated server and the hacker managed to insert php files that generated thousands of doorway pages in one of our images folder on our site. We have done an extensive cleanup of our site, removing all malicious files and are locking down the server. We have already updated to the latest versions of PHP and Wordpress,not to mention change all database passwords and admin password. My question is about mod_security for apache.
We were told Mod_security can prevent this from happening again but it must be configured correctly.
We have already set rules for mod_security. The rules set up are in the files in the directory, /etc/httpd/modsecurity.d/modsec. We were told that the file 10_asl_rules.conf specifically has filters to prevent SQL injection attacks.
These are are current rules:
----------------------------------------------------------------------
/etc/httpd/modsecurity.d/modsec
# ls
05_asl_exclude.conf 30_asl_antispam.conf domain-blacklist-local.txt malware-blacklist.txt
05_asl_scanner.conf 30_asl_antispam_referrer.conf domain-blacklist.txt sql.txt
10_asl_antimalware.conf 40_asl_apache2-rules.conf domain-spam-whitelist.conf trusted-domains.conf
10_asl_rules.conf 50_asl_rootkits.conf domain-spam-whitelist.txt trusted-domains.txt
11_asl_data_loss.conf 60_asl_recons.conf malware-blacklist-high.txt whitelist.txt
20_asl_useragents.conf 99_asl_exclude.conf malware-blacklist-local.txt
30_asl_antimalware.conf 99_asl_jitp.conf malware-blacklist-low.txt
-----------------------------------------------------------------
I can do to prevent this or tune up apache mod_security from letting this happen again. We are so paranoid that we are now checking our access log files for POST commands every day?
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Jul 2, 2009
Im using a vps with centos 5 and cpanel/whm with apache 2.2.
Im tring to figure out how to use the gotroot rules with mod_security. I had enabled mod_security with easy apache. I tried to follow some other post had I found around on other forums with no luck really, with that said I am a linux noob. I had tried to follow the wiki on atomic sites <-- not enof post so I cant do links sorry, but I found it hard to under stand cause I dont have a modsecurity.config file that I can find, also I cant find AddModule mod_security.c in my httpd.config, but I did find this line, Include "/usr/local/apache/conf/modsec2.conf". My thing is im looking for a complete noob guide on how to use gotroot rules with mod_security enabled through easy apache, or would it be easyer to manully install mod_security?
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Nov 4, 2009
I am having the Modsec 2.5.9 I am using the defaults rules by the cpanel when i try to update the rules along with default rules given by the cpanel i am getting internal server error (500 Error)
The rules i tried to implement are from
Quote:
[url]
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May 1, 2009
How can I update mod_security rules in Cpanel/WHM server from gotroot.com?
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