Date: Fri, 21 Dec 2001 01:09:00 -0600 (CST) From: Ryan Thompson <ryan@sasknow.com> To: Philip Hallstrom <philip@adhesivemedia.com> Cc: Lee Mark Mercado <mercadolee@hotmail.com>, <freebsd-questions@FreeBSD.ORG> Subject: Re: avoid ping Message-ID: <20011221010222.R374-100000@catalyst.sasknow.net> In-Reply-To: <20011220222948.R19330-100000@teak.adhesivemedia.com>
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Philip Hallstrom wrote to Lee Mark Mercado:
> You could configure your firewall to deny those icmp packets...
Yes, but it should be pointed out that you almost certainly don't want
to deny ALL ICMP traffic, as some of it is actually useful :-)
Basically, man 8 ipfw, /icmptypes .. You will want to deny one or both
of echo reply (ICMP type 0), and echo request (type 8).
You might try something like the following. The command below will
allow you to ping other hosts (and will allow the replies to come
back), but will NOT allow echo requests to come IN to your
machine/network:
ipfw add 400 deny icmp from any to ${you} icmptype 8
Where ${you} is the public IP address of your machine, or network
address of your subnet.
Hope this helps!
- Ryan
> -philip
>
> On Thu, 20 Dec 2001, Lee Mark Mercado wrote:
>
> >
> >
> > how could i avoid being pinged ? i know theres no port for ping and it uses
> > icmp - how could i avoid it then ?
> >
> > need help. thx
> >
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--
Ryan Thompson <ryan@sasknow.com>
Network Administrator, Accounts
SaskNow Technologies - http://www.sasknow.com
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