From: /dev/rob0 <rob0@gmx.co.uk>
To: netfilter@lists.netfilter.org
Subject: Re: Allowing ping
Date: Wed, 26 Oct 2005 10:55:48 -0500 [thread overview]
Message-ID: <200510261055.48199.rob0@gmx.co.uk> (raw)
In-Reply-To: <435E6C3A.20709@beaconet.net>
On Tuesday 2005-October-25 12:32, Askar Ali wrote:
> I have a very simple question, presently we are blocking icmp
> "ping" on our servers. But as far I can userderstand its not very
> good practice or providing a good security by blocking ping request.
I agree. Blocking pings is like shooting yourself in the foot. You
never know when you will need ping. Some think it's a good idea to try
to hide. Rubbish, if you have any open services, the bots and worms
will find you anyway.
> see one can ping www.xyz.com and get the reply back.
>
> However Before allowing ping "echo-request" I just want to confirm
> whether doing ...
>
> iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
>
> would be enough or doing some rate limiting would be better?
I think a reasonable --limit is not a bad idea, but there is no
objective measurement of "better". I use a --limit on incoming ping
requests. It might help in the event of a flood ping attack, and you
can still ping to verify your connectivity when you need it.
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next prev parent reply other threads:[~2005-10-26 15:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-25 17:32 Allowing ping Askar Ali
2005-10-26 15:55 ` /dev/rob0 [this message]
2005-10-26 15:59 ` Pablo Sanchez
2005-10-26 16:24 ` Askar
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