IPTables

Mar 25, 2007

I got blocked by my server. Hivelocity helped me to gain access by my server.

I was told that to avoid being blocked again I should type

iptables -A INPUT 202.155.151.185 -j ACCEPT

What I ended up was

iptables -A INPUT 202.155.151.185 -j ACCEPT
Bad argument `202.155.151.185'
Try `iptables -h' or 'iptables --

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After Flush+zero Iptables, Will A New Iptables Ban Work

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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Iptables Gone

Aug 4, 2006

I am experiencing a strange problem with iptables: after in activate them, they are gone in a few minutes. For example, I drop traffic from an ip and after few seconds, all rules are flushed without touching anything!

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How Many IPs Can I Add To IPtables ?

Jan 20, 2008

I need to block about 5000 IPs .. Is it possible to add this amount of IPs to iptables?

I mean ... Will this slow down the machine response?

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Iptables Or Apf?

May 24, 2007

What do you prefer or what do you think is better, iptables or apf for a firewall?

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Csf And Iptables

Apr 13, 2009

i install csf on centos,

my server is working but the network is unreachable,

i try to run "service iptables stop",

and the server is unreachable now,

i check from whm,it shows csf is working,

but i ssh the server and type "service iptables status",

it shows "firewall is stopped",

is it correct?

is not,how can i fix the issue?

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IPTables

Apr 10, 2009

Is there a way for me to whitelist myself or something?

I get up everyday and have to call LSN because my server has blocked me for some reason...

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Iptables

Feb 4, 2007

If I keep getting spam from a certain IP, can I add that IP to Iptables? Will it stop me receiving spam from that IP? I'm not quite sure how it all works.

Or what is the most effective method to stop spam?

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IPTables

Sep 21, 2007

I've got two VPS's and both have the same ruleset for outbound EG_TCP

Code:
EGF="1"

EG_TCP_CPORTS="21,25,37,43,53,80,110,113,123,443,873,2089,3306"

EG_UDP_CPORTS="53,465,873,6277"
Whenever I turn EGF to 1 my VPS locks me out of everything, I need togo into hyperVM to turn it off and restart my firewall.

What would cause this?

It's Fedora Core 5 on OpenVZ i've googled and cannot seem to find a reason why it would do that. Could be something in the host node kernel that may need adjusting?

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Iptables

May 15, 2007

I am working with iptables and am trying to figure out the best ruleset for cpanel servers.

I have a few custom ports for a few services, but other than that, does anyone have a recommended ruleset for the typical cpanel cluster?

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Iptables

Sep 12, 2007

how can i clear iptables?

i enter many ip in it that most of them is worng and i must clear it

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Iptables

Oct 29, 2007

Do you find iptables enough or do you use a hardware firewall for linux? I haven't used anything less than hardware firewalls for years but I gather than most simply rely on iptables. Is that a smart choice?

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Iptables !

Sep 27, 2007

i have code :

1. IF=`/sbin/route | grep -i 'default' | awk '{print$8}'`
2. IP=`/sbin/ifconfig $IF | grep "inet addr" | awk -F":" '{print$2}' | awk '{print $1}'`
3. IPT="/usr/sbin/iptables"
4. NET="any/0"
5. DNS="xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy"
6. SERV_TCP="22 80 443 "
7. SERV_UDP="53 123"
8. HI_PORTS="1024:65535"
........

i dont know line of 5's sense .I am must changed warrant is what?

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Iptables

Oct 6, 2007

Code:

# iptables -D INPUT -s 25.55.55.55 -j DROP
iptables v1.3.8: Couldn't load target `standard':/usr/local/lib/iptables/libipt_standard.so: cannot open shared object file: No such file or directory
What is going on? The libipt_standard.so file is located in /lib/iptables, but not /usr/local/lib/iptables. I tried moving all of the libipt files into the /usr/local/lib/iptables directory, but I got segmentation errors.

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APF & Iptables Not Starting

Nov 7, 2006

I have installed APF on box and set ports for in and out and enabled it.. of course, iptables is running from booting..

[root@localhost /]# runlevel
N 3
[root@localhost /]# chkconfig --list | grep iptables
iptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[root@localhost /]# chkconfig --list | grep apf
apf 0:off 1:off 2:off 3:on 4:on 5:on 6:off

but when I check it like this

[root@localhost ~]# service iptables status
Firewall is stopped.
[root@localhost ~]# service iptables start
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: ^[[A [ OK ]
[root@localhost ~]# service iptables status
Firewall is stopped.

it said iptables is stop...even I start manually...

I am not sure APF is running correctly because of iptables..

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Cannot Load Iptables

Sep 10, 2006

# apf -r
Unable to load iptables module (ip_tables), aborting.

# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

# uname -a
Linux servername 2.6.17.9 #1 SMP Sun Aug 27 17:08:11 ICT 2006 i686 athlon i386 GNU/Linux


is there any reason that I cannot use iptables? If I edit monokern option in apf to 1, I cannot use ftp in passive mode

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Iptables Not Working With CSF

Feb 7, 2008

I have CSF installed on one of our server.

CSF dont ban the IP and if manually it is done I get following error.
----------------
csf -d 195.88.65.47
Adding 195.88.65.47 to csf.deny and iptables DROP...
iptables: Index of insertion too big
DROP all opt -- in !lo out * 195.88.65.47 -> 0.0.0.0/0
Error: iptables command [/sbin/iptables -v -I INPUT 2 -i ! lo -s 195.88.65.47 -j DROP] failed, at line 864
-------------------
Also iptables is not running on server.
If status is checked it says its stopped.

I have many sites on my server I dont want to get any downtime.

Please let us know how can we fix this issue as soon as possible.

I have tried reinstall CSF but still the issue remains same.

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Flushing Iptables

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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Iptables Don't Start

Jun 4, 2007

root@xxxx[~]# service iptables status
Firewall is stopped.
root@xxxx[~]# service iptables start
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
root@xxxx[~]# service iptables status
Firewall is stopped.

why not iptables don't start ?

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Iptables Do Not Start

Apr 23, 2009

i create a template for xen ( hypervm ) from jailtime site. now i install iptables , but iptables do not work and when i enter " service iptables restart" , iptables do not start. ( i check it from "service iptables status" )

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Iptables Processing

Apr 23, 2007

I used a script to block some unwanted countries from accessing my site. In total I had about 3000 lines with ipranges. Now I just went ahead and put this on one of the servers, one that I really don't need the traffic on. But I am wondering what kind of affect this may have on the speeds. Will it really affect it more then a few ms? And anything else I should maybe worry about? Except maybe the loading time at reboots.

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Iptables Not Working

Aug 5, 2008

After I start iptables:
service iptables start
There is not any message coming up.
When use
service iptables status,
It said:
iptables: Firewall is not running.

My os is fedora core 6

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Why Iptables Not Work

May 28, 2009

My site is under DDOS attack. I run this command

netstat -an | grep :80 | grep ffff | awk '{print $5}' | cut -f 4 -d : | sort | uniq -c | sort -n | tail -10

And find a lot of IP that are attacking. After that, i run

iptables -A INPUT -s xxx -j DROP

to block IP, and

service iptables save

service iptables restart

But when i run netstat command abouve, i found IP are attacking still available, it seem iptables don't block it?

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IPTables/Conntrack

Aug 4, 2009

I upgraded to the 2.6.27 kernel and iptables to 1.4.2 but can't seem to get CSF to run and i believe its because of conntrack not being found:

Code:
error: "net.netfilter.nf_conntrack_icmp_timeout" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_close" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_time_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_last_ack" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_close_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_fin_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_established" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_syn_recv" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_syn_sent" is an unknown key
error: "net.netfilter.nf_conntrack_udp_timeout" is an unknown key
error: "net.netfilter.nf_conntrack_udp_timeout_stream" is an unknown key
net.netfilter.nf_conntrack_max = 262144
kernel config:

Code:
#
# Core Netfilter Configuration
#
CONFIG_NETFILTER_NETLINK=m
CONFIG_NETFILTER_NETLINK_QUEUE=m
CONFIG_NETFILTER_NETLINK_LOG=m
CONFIG_NF_CONNTRACK=m
CONFIG_NF_CT_ACCT=y
CONFIG_NF_CONNTRACK_MARK=y
# CONFIG_NF_CONNTRACK_SECMARK is not set
# CONFIG_NF_CONNTRACK_EVENTS is not set
CONFIG_NF_CT_PROTO_DCCP=m
CONFIG_NF_CT_PROTO_SCTP=m
# CONFIG_NF_CT_PROTO_UDPLITE is not set
# CONFIG_NF_CONNTRACK_AMANDA is not set
CONFIG_NF_CONNTRACK_FTP=m
# CONFIG_NF_CONNTRACK_H323 is not set
# CONFIG_NF_CONNTRACK_IRC is not set
# CONFIG_NF_CONNTRACK_NETBIOS_NS is not set
# CONFIG_NF_CONNTRACK_PPTP is not set
# CONFIG_NF_CONNTRACK_SANE is not set
# CONFIG_NF_CONNTRACK_SIP is not set
# CONFIG_NF_CONNTRACK_TFTP is not set
# CONFIG_NF_CT_NETLINK is not set
CONFIG_NETFILTER_XTABLES=m
CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m
CONFIG_NETFILTER_XT_TARGET_CONNMARK=m
# CONFIG_NETFILTER_XT_TARGET_DSCP is not set
CONFIG_NETFILTER_XT_TARGET_MARK=m
CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m
# CONFIG_NETFILTER_XT_TARGET_NFLOG is not set
CONFIG_NETFILTER_XT_TARGET_NOTRACK=m
# CONFIG_NETFILTER_XT_TARGET_RATEEST is not set
# CONFIG_NETFILTER_XT_TARGET_TRACE is not set
CONFIG_NETFILTER_XT_TARGET_SECMARK=m
# CONFIG_NETFILTER_XT_TARGET_TCPMSS is not set
# CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP is not set
CONFIG_NETFILTER_XT_MATCH_COMMENT=m
CONFIG_NETFILTER_XT_MATCH_CONNBYTES=m....

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Iptables Rules

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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Tarpit/iptables

Jun 18, 2009

While tarpit is outdated, is it still considered an ideal way to drop DDoS Attacks?

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Iptables Module

May 27, 2009

how can i chek that my iptables firewall have this module?
ipt_recent

and if it is not installed...

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Webmin ( Iptables)

May 30, 2009

we have problem with webmin and iptables

we must STOP iptables service to work webmin !

also when iptables running seems apache goes down we must STOP iptable service to work apache.

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Iptables Repair

May 18, 2008

Our server iptables damaged, how can repair server iptables?

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How Do I Disable IPTables?

Dec 5, 2008

I installed APF/BFD a log time ago on my centos server and have had no problems up until now.

Approx 3 days ago, the server was uncontactable by SSH/HTTP/FTP. So I ran a traceroute and the host confirmed the box was up with no problems.

He disabled IPTables and I was allowed in. Anyway, overnight, the same thing has happenned again.

I will have to SSH in from another IP however, my main question is how do I disable IPTables ? Or better still, how do I uninstall APF!

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How To Stop Iptables

May 4, 2008

to stop iptables cause when any user make refresh he is take banned from server

i need to stop iptables or how to make rules for it

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