for over a year now, with iptables. However recently, after upgrading to apache 2.2, the connections in netstat get listed as ipv6. A row can look like this for example:
As you can see, the remote ip address isn't complete, it's cut off, so the script used to sum up connections and insert into iptables isnt doing anything.
I am not shure if this is a configuration problem or it's bacause netstat has it's own way to display things.
Recently csf blocked an IP address for flooding.
My server ip address is something like 192.168.1.201.
The ip that csf blocked was 192.168.1.20.
That IP belongs to an other server that is not ours.
netstat was showing a lot of connections from 192.168.1.20 (the ip that is not ours) but the guys that manage the server with that ip (192.168.1.20) did not saw any connection from them to us. So I thought it's just a spoofed flood. But, the thing is I've blocked that ip and still connections were made.
My conclusion was that netstat was showing 192.168.1.20 "flooding" instead of 192.168.1.201. (the server was connectiong to itself).
iptraf also was showing the server was connecting to itself on the lo interface.
My questions are: csf is based on netstat for tracking connections? has anyone had ths type of problem before? If netstat is showing something else isn't this a bad thing for all (a lot) the scripts that use netstat?
I then turned on the brute force protection cPanel provides, and it went down considerably from there. I'm not concerned at all about it (since the passwords are strong), but I would like to know the best way to determine abusive users (of SSH), and the best way to ban them.
Assuming the server does not have APF installed, or any particular control panel...
Getting these emails, several a day telling me that the server is banning its own allocated IP addresses. Can someone explain what on earth it could possibly be doing to ban its own IP's?
From - Thu Dec 20 16:50:47 2007 X-Account-Key: account3 X-UIDL: GmailId116f88c2a1c060ca X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 X-Mozilla-Keys: Delivered-To: myemail@gmail.com Received: by 10.90.78.14 with SMTP id a14cs288558agb; Thu, 20 Dec 2007 09:14:04 -0800 (PST) Received: by 10.142.177.7 with SMTP id z7mr183490wfe.47.1198170843836; Thu, 20 Dec 2007 09:14:03 -0800 (PST) Return-Path: <root@host.domain.com.br> Received: from server.domain.com.br (domain.com.br [xxx.xxx64.138]) by mx.google.com with ESMTP id m8si38592roe.1.2007.12.20.09.14.03; Thu, 20 Dec 2007 09:14:03 -0800 (PST) Received-SPF: pass (google.com: domain of root@server.domain.com.br designates xxx.xxx.64.138 as permitted sender) client-ip=xxx.xxx.64.138; Authentication-Results: mx.google.com; spf=pass (google.com: domain of root@server.domain.com.br designates xxx.xxx.64.138 as permitted sender) smtp.mail=root@server.domain.com.br Received: from root by server.domain.com.br with local (Exim 4.68) (envelope-from <root@server.domain.com.br>) id 1J5OyA-0004us-63 for root@server.domain.com.br; Thu, 20 Dec 2007 15:13:39 -0200 To: root@server.domain.com.br Subject: IP addresses banned on Thu Dec 20 15:13:39 BRST 2007 Message-Id: <E1J5OyA-0004us-63@server.domain.com.br> From: root <root@server.domain.com.br> Date: Thu, 20 Dec 2007 15:13:39 -0200 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.domain.com.br X-AntiAbuse: Original Domain - server.domain.com.br X-AntiAbuse: Originator/Caller UID/GID - [0 0] / [47 12] X-AntiAbuse: Sender Address Domain - server.domain.com.br
Banned the following ip addresses on Thu Dec 20 15:13:38 BRST 2007
xxx.xxx64.138 with 151 connections
I have centos 4 / cpanel installed with apf / bfd yet the deny host rules for apf does not show the server IP's listed as banned.
I need to ban IP range and I inserted say ip 12.44.0.0 in the deny_hosts rules, this should ban range from 12.44 but strange is people from that range still be able to access my site, any idea what went wrong?
what does the below command actually means I mean when we use it? and in which case it help us? and up to what value there is nothing to worry about? Waiting for detailed reply
my VPS provided didn't enable a lot of modules and that's why I can use a firewall(csf or apf) and dos deflate script
I need a simple script for it.
First,it has to call this: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n then there will be something like: Number : IP address 20 1.2.3.4 40 1.2.3.5 80 1.2.3.6 and then the bash script has to bann IPs with more than 30 connections(In our case: 1.2.3.5 and 1.2.3.6) with this: iptables -A INPUT -s IP_FOR_BLOCK -j DROP
I want to stop users from country X from accessing my website, I know I can ban people's IPs but I dont know if it is possible to ban certain geographical area and if so, I haven't got a clue about how to do it.
I'm new to server administration/security/troubleshooting, so I have included a lot of info here hoping it will help.
This started because a Linux VPS with CentOS and Exim crashed after only 3000 emails were sent (of 30000) total
I ran a netstat and several times I get three separate ips with the only difference being the last two digits and the port number: 86.104.230.29:59009 86.104.117.45:18065 89.37.137.157:41593
As far as I can tell they are from Romania, and there are several connections.
I have posted a lot of information below, if someone can take a look and give some ideas, it would be very much appreciated.
I installed mod_security and the 403security rules on my VPS (Centos 4.1, Release version of WHM).
Several vBulletin files, including the ajax quick editor and some vbulletin.org add-ons are triggering this rule and banning members' IPs in CSF:
# Restrict witch content encodings we accept. # # TODO Most applications support only two encodings for request bodies # because that is all browsers know how to produce. If you are using # automated tools to talk to the application you may be using other # content types and would want to change the list of supported encodings. # # Note though that ModSecurity parses only three content encodings: # application/x-www-form-urlencoded, multipart/form-data request and # text/xml. The protection provided for any other type of encoding is # inferior. # # TODO There are many applications that are not using multipart/form-data # encoding (typically only used for file uploads). This content type # can be disabled if not used. # # NOTE We allow any content type to be specified with GET or HEAD # because some tools incorrectly supply content type information # even when the body is not present. There is a rule further in # the file to prevent GET and HEAD requests to have bodies to we're # safe in that respect. # # NOTE Use of WebDAV requires "text/xml" content type. # # NOTE Philippe Bourcier (pbourcier AT citali DOT com) reports # applications running on the PocketPC and AvantGo platforms use # non-standard content types: # # M-Business iAnywhere application/x-mal-client-data # UltraLite iAnywhere application/octet-stream # SecRule REQUEST_METHOD "!^(?:get|head|propfind|options)$" "chain, t:lowercase, deny,log,auditlog,status:501,msg:'Request content encoding is not allowed by policy',id:'960010',severity:'4'" SecRule REQUEST_HEADERS:Content-Type "!(?:^(?:application/x-www-form-urlencoded$|multipart/form-data;)|text/xml)" I don't know how to decipher this rule to know if just removing it is ok, or if it is serving an important purpose. During a couple hour period it was enabled, that rule only seemed to trigger false alarms.
The above was triggered with calls such as [uri "/forums/ajax.php?do=usersearch"] and [uri "/forums/newreply.php?do=postreply&t=11057"]
What I really don't understand is that I have an .htaccess in place to turn off mod_security for the /forums directory:
<IfModule mod_security.c> SecFilterEngine Off SecFilterScanPOST Off </IfModule> I have also had this rule triggered today when someone tried to access : ...
# If a PT_LOAD event is triggered, then if the following contains the path to # a script, it will be run in a child process. For example, the script could # contain commands to terminate and restart httpd, php, exim, etc incase of # looping processes. The action script must have the execute bit an # interpreter (shebang) set
It's a feature of CSF, how to write a script that will output the contents of top -c to another file?
Problem is that the only way to stop this command is pressing CTRL + C, and i just need some option to specify how much time the tcpdump will be running, i need it running for 1 minute for example, and then it should automatically stop.
how do i get all the current dns values for a domain name? i have tried using 'dig domain any' and get varied results. the first time it is as if i ran 'dig domain a' I then run 'dig domain mx' and see the mx records. an issue of 'any' then shows the mx records so far i have to run dig with every record type. what is another way to get all the dns values for a domain name?
I am having a very weird problem with virtuozzo. I created about 8 VPS in my server. But when i logged into the server after two days, I could find that some of the VPS i had created disappeared. And the ones that still listed, were in the mounted state.
I have no idea of what is happening with the server. To list all the VPS back i had to log into the base node and restart service vz.
I don log into the virtuozzo very often, but whenever i log into the panel after some time ( a day or two) this is what happens.
I need to move clients over to the new VPS, but the issue is causing a lot of worry for me. What if this happens once i move the client over. I cannot always go restarting th vz.
What command could I use to get the last line of an output?
Heres why...
I use this command:
netstat -plan|grep :80|awk {'print $5'}|cut -d: -f 1|sort|uniq -c|sort -nk 1 I would like to get just the last line of the output, the output looks like this:
The reason is because I'd like to get that last figure to place into a file on a certain time period (through a cron), which will then be graphed with PHP.
I use Munin to monitor the health of our servers, I can tell by looking at the graphs there's nothing to worry about, however, I'm struggling to baseline acceptable performance.what would be classed as 'normal' output for some of the more relevant munin graphs.
I've been looking at the Apache* modules and this is the output from one of our servers:
average of: 300 accesses per minute, 6 busy servers and 4.10MB a minute volume
max of: 1400 accesses per minute, 81 busy servers and 51MB a minute volume
This is a dedicated box running one site.
We have another box that is running approximately 30 sites
average of: 30 accesses per minute, 1 busy server and a 500K a minute volume
max of: 322 accesses per minute, 11 busy servers and a 4MB a minute volume.
These servers are pretty much the same spec, dual core 64Bit, 4GB of ram, two SATA disks in RAID1.
I've read that Virtuozzo 4.0 supported ipv6. I'm having problems finding anything to help setup the node for ipv6. I can't anything on the web except for some people talking about how to disable ipv6. So I was just wondering if anyone else has seen anything.
Edit: I don't think I posted in the correct section. Opps. Could a moderator move this to the right section?
