BLOCK Pings

Ltech · 05-07-2010, 09:13 AM

Hi,

How can I BLOCK pings with IPCHAINS/IPTABLES, whats the line or rule for it?

Thanks.

pixellany · 05-07-2010, 09:21 AM

Google is your friend:
http://www.frozentux.net/iptables-tu...-tutorial.html

Ltech · 05-07-2010, 03:41 PM

I did find something but I'm sure how to reverse it to IPTABLES.

Code:

ipchains -A input -s 127.0.0.1 -p icmp -j DENY

And I couldn't figure out how to ICMP type/code to block more specific packets alike:
0 echo-reply ping
5 redirect routing if not running routing daemon
8 echo-request ping
11 time-exceeded traceroute

Of course I was hoping someone who knew the answer would type it out.

TB0ne · 05-07-2010, 04:11 PM

Quote:

Originally Posted by Ltech

I did find something but I'm sure how to reverse it to IPTABLES.

Code:

ipchains -A input -s 127.0.0.1 -p icmp -j DENY

And I couldn't figure out how to ICMP type/code to block more specific packets alike:
0 echo-reply ping
5 redirect routing if not running routing daemon
8 echo-request ping
11 time-exceeded traceroute

Of course I was hoping someone who knew the answer would type it out.

You just need to block ICMP, period. And we were hoping that you'd read the iptables man page, which will tell you how to make that rule, or that you'd follow that link and read it.

win32sux · 05-09-2010, 02:01 AM

If you only want to prevent ping from being used on you, then just block ICMP type 8 packets, like:

Code:

iptables -I INPUT -p ICMP --icmp-type 8 -j DROP

I really think this is a better approach than blocking all ICMP packets (due to potential negative side-effects) but it's up to you, of course. At least this should clarify for you the syntax for specifying ICMP types/codes.

Ltech · 05-10-2010, 01:40 PM

Thanks, that is what I was searching for.

I know which types I wanna block so thats ok.

Thanks.