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  #1  
Old 07-13-2006, 10:44 AM
darkink darkink is offline
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how to block ip in freebsd


Hi

There is a ip attacking my server, how to block this ip in freebsd?



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  #2  
Old 07-13-2006, 10:47 AM
yourwayit yourwayit is offline
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Assuming you have iptables installed ....

iptables -I INPUT -s 25.55.55.55 -j DROP

Just replace the 25.55.55.55 with the attacking Ip.

Also, you might want to consider installing something like BFD to automatically take care of this in the future.

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  #3  
Old 07-13-2006, 11:01 AM
darkink darkink is offline
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but i think freebsd does not have iptables

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  #4  
Old 07-13-2006, 11:15 AM
yourwayit yourwayit is offline
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You're completely right. Sorry, I've just been installing APF and BFD all morning so I just read your post too quick.

For starters throw the ip in /etc/hosts.deny. I believe there are BSD equivalents of iptables but I have not used them. A quick google search did turn up some results of programs called ipfilter, ipnat .

This URL may also be helpful: http://www.freebsd.org/doc/en_US.ISO...alls-apps.html

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  #5  
Old 07-13-2006, 11:32 AM
Steven Steven is online now
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ipfw add deny from 196.168.2.1 to any

If you have ipfw in your kernel. You could also load it with kldload in most cases.

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  #6  
Old 07-13-2006, 05:23 PM
darkink darkink is offline
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i want to use ipfw and ipf, anybody can provide exact command?

  #7  
Old 07-13-2006, 07:18 PM
avythe avythe is offline
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Quote:
i want to use ipfw and ipf, anybody can provide exact command?
Steven just did...
Quote:
ipfw add deny from 196.168.2.1 to any
where 192.168.2.1 is the ip you want to block (although adding in via type to the end would be better )

If you don't have ipfw loaded, I'd highly recommend recompiling your kernel with it, but as Steven said, you can probably also use kldload to load it.

  #8  
Old 07-13-2006, 07:36 PM
Patrick Patrick is offline
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The correct way would be:

ipfw deny ip from <ipaddress> to any via <interface>

Eample:
ipfw deny ip from 1.2.3.4 to any via bge0

You can get your inteface name by typing ifconfig...

  #9  
Old 07-13-2006, 09:13 PM
choon choon is offline
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Quote:
Originally Posted by Pat H
The correct way would be:

ipfw deny ip from <ipaddress> to any via <interface>

Eample:
ipfw deny ip from 1.2.3.4 to any via bge0

You can get your inteface name by typing ifconfig...
Steven's one is good enough whereby yours lack of add command in your ipfw... ...

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  #10  
Old 07-13-2006, 10:42 PM
Steven Steven is online now
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Quote:
Originally Posted by Pat H
The correct way would be:

ipfw deny ip from <ipaddress> to any via <interface>

Eample:
ipfw deny ip from 1.2.3.4 to any via bge0

You can get your inteface name by typing ifconfig...

If you are going to contradict a method of doing something at least make sure yours is correct. The interface is not required.

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  #11  
Old 07-14-2006, 01:34 AM
Patrick Patrick is offline
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Quote:
Originally Posted by choon
Steven's one is good enough whereby yours lack of add command in your ipfw... ...
Steven's also doesn't work?

# ipfw add deny from 196.168.2.1 to any
ipfw: unrecognised option [-1] from


  #12  
Old 07-14-2006, 01:38 AM
Patrick Patrick is offline
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Quote:
Originally Posted by Steven
If you are going to contradict a method of doing something at least make sure yours is correct. The interface is not required.
I'm not contradicting anything. I posted a working way to block an IP address, but you are correct that the interface isn't really needed.

You're the last person I want to get into a technical "show down" with.

  #13  
Old 07-14-2006, 02:45 AM
Steven Steven is online now
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guess we both forgot part of it. You forgot the add and i forgot the ip

Quote:
LA1063# ipfw add deny ip from 196.168.2.1 to any
00200 deny ip from 196.168.2.1 to any
LA1063#

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  #14  
Old 07-14-2006, 03:00 AM
Cirrostratus Cirrostratus is offline
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I would not use 'ipfw' if your new to it. It has a nice way of locking you out completely if you do not have a open ruleset ready to load or custom kernel telling it to pass all by default. 'pf' on the other hand is very easy to use and quite tame.

See below and enjoy

Paste this into a new copy of your '/etc/pf.conf'

### start

# External
ext_if = "em1"
set loginterface $ext_if
set block-policy drop

# Any host or range listed in this macro will be blocked.
badguys="{ 192.168.1.100, 192.160.1.2, 192.168.200.0/24 }"

# With logging ( chews up CPU during dDoS )
# block in log quick on $ext_if from $badguys

# Without logging
block in quick on $ext_if from $badguys

### End

Paste this into a '/etc/pf.conf.open' You will need to create a new file for this.

### start

pass all

### end

Then run the following as root via ssh

kldload pf.ko

# Enable PF on boot via rc.conf
grep pf_ /etc/defaults/rc.conf | sed 's/NO/YES/g' >> /etc/pf.conf

# Enable PF real time ( should not lock you out )
pfctl -e
# View the rules / Test
pfctl -vvv -nf /etc/pf.conf

# When you see no syntax errors you can try them out for 60 seconds
# note you will freeze the current ssh term when this happens. Have a second
# ready to test with.

pfctl -v -f /etc/pf.conf; sleep 60 ; pfctl -v -f /etc/pf.conf.open

# Once the rules are all good you can load them

pfctl -vvv -f /etc/pf.conf

# To see stats view ( remove 'v's ' to lower verbosity

pfctl -sa -vvvv

# Disable pf
pfctl -d

See http://www.openbsd.org/faq/pf

For more details.

Jeremy


Last edited by Cirrostratus; 07-14-2006 at 03:05 AM.
  #15  
Old 07-14-2006, 03:58 AM
Cirrostratus Cirrostratus is offline
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Forgot one important line.

Put this right after the 'badguys' line

# Example

badguys="{ 192.168.1.100, 192.160.1.2, 192.168.200.0/24 }"

# Pass all by default
pass all

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