Under Attack LF_PERMBLOCK : 1

Apr 1, 2009

i,m under attack i got in csf today this

77.195.42.235 # lfd: (PERMBLOCK) 77.195.42.235 has had more than 4 temp blocks in the last 86400 secs - Wed Apr 1 09:39:35 2009

151.60.86.210 # lfd: (PERMBLOCK) 151.60.86.210 has had more than 4 temp blocks in the last 86400 secs - Wed Apr 1 09:39:51 2009

and these two ips was attack me them down site for 2 minutes but then block in csf

so i just wanna ask now this option in CSF

LF_PERMBLOCK : 1

i make it open 1 so this the reason can block the ips attack. or this the reason make them can attack ?

so i should keep this option 1 or make it 0 to stop this kind of ddos attacking?

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Is This A DOS Attack?

Mar 11, 2008

Quote:




Mar 10 20:17:55 host kernel: printk: 102 messages suppressed.
Mar 10 20:17:56 host kernel: printk: 3 messages suppressed.
Mar 10 20:18:01 host kernel: printk: 98 messages suppressed.
Mar 10 20:18:35 host kernel: printk: 34 messages suppressed.
Mar 10 20:18:51 host kernel: printk: 189 messages suppressed.
Mar 10 20:18:56 host kernel: printk: 195 messages suppressed.
Mar 10 20:19:02 host kernel: printk: 249 messages suppressed.
Mar 10 20:19:06 host kernel: printk: 36 messages suppressed.
Mar 10 20:19:21 host kernel: printk: 3 messages suppressed.
Mar 10 20:19:26 host kernel: printk: 342 messages suppressed.
Mar 10 20:19:31 host kernel: printk: 509 messages suppressed.
Mar 10 20:19:47 host kernel: printk: 54 messages suppressed.
Mar 10 20:19:51 host kernel: printk: 421 messages suppressed.
Mar 10 20:19:56 host kernel: printk: 542 messages suppressed.
Mar 10 20:20:01 host kernel: printk: 785 messages suppressed.
Mar 10 20:20:16 host kernel: printk: 340 messages suppressed.
Mar 10 20:20:21 host kernel: printk: 337 messages suppressed.
Mar 10 20:20:26 host kernel: printk: 430 messages suppressed.




Or is this something else? It's been going on for about 40 minutes. I seen my load jump to 20, to 100 and back and fourth

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Jul 18, 2009

My server stop responding, I couldn't access via webmin or ssh, and DNS were not responding, so I have to ask for a reboot and now everything is fine.

Looking at the logs I found this:

Code:
Jul 18 19:23:12 server sshd[18484]: Failed password for root from 61.145.196.117 port 56817 ssh2
Jul 18 19:23:12 server sshd[18485]: Failed password for root from 61.145.196.117 port 60227 ssh2
Jul 18 19:23:13 server sshd[18488]: Failed password for root from 61.145.196.117 port 38038 ssh2
Jul 18 19:23:15 server sshd[18493]: Failed password for root from 61.145.196.117 port 49884 ssh2
Jul 18 19:24:30 server sshd[18497]: Failed password for root from 61.145.196.117 port 37929 ssh2
Jul 18 19:25:06 server sshd[18521]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:09 server sshd[18508]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:14 server sshd[18505]: fatal: Timeout before authentication for UNKNOWN
Jul 18 19:26:00 server sshd[18509]: Did not receive identification string from 61.145.196.117
And searching that IP on google I found it here: http://www.tcc.edu.tw/netbase/net/in...?fun=240&prd=3

And is flagged as a SSH Attack.

Any ideas why my server stopped working? and how to prevent it?

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May 12, 2009

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I've blocked all access except for my country and some other neighbours. If i change policy to allow all countries, the load of firewall will become max and after that hang will hang in less than a minute. I've done load balancing of 4 servers (8GB memory each one) and it seems the condition is getting under control with slight problem of server hang (memory shortage) and very limited keep alive connection.

Now what am i thinking is to buy a router objectively to null route incoming specific IP of countries so i can change my firewall policy to allow all connections as well as to help the firewall itself release its burden halting blocked IP that currently keep hitting itself that could might impact its performance.

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Apr 12, 2008

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Dec 9, 2008

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Connecting to gihkus.com|208.98.48.116|:80... connected.
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0K .......... ...... 100% 316.78 KB/s

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Mar 19, 2008

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[root@ ~]#

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Jan 6, 2009

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Jul 28, 2009

We are currently experiencing an SYN Flood attack on our primary production server and are looking for some help in resolving the issue.

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Every once in a while a page will load for the websites, I think we've got just under 50 legit connections.

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Jul 2, 2009

My server is currently underattack, I have been able to keep it up but after I ban 500 IPs, I get a lot of different IPs again.

Any idea or suggestion to do mass-ban to those attacking IPs?

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Feb 4, 2008

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In a very short amount of time it has has over 300,000 page requests for the same three pages.

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Dec 16, 2008

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Mar 6, 2008

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Code:
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It would be very interesting if the IP is being attacked or one of the sites I host.

I have already over 300GB traffic since yesterday because of this.

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Feb 23, 2008

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/var/qmail/bin/qmail-qstat

and it came out with..

messages in queue: 3061
messages in queue but not yet preprocessed: 29

is that a lot of messages in queue?

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Nov 23, 2008

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Mar 18, 2008

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Logs of my wamp5 apache:
(cant post URL)

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