From: Rob Landley <rob@landley.net>
To: Woody Wu <narkewoody@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Why a host not ping-able?
Date: Tue, 04 Dec 2012 05:34:54 -0600 [thread overview]
Message-ID: <1354620894.27682.5@driftwood> (raw)
In-Reply-To: <slrnkbr59r.us1.narkewoody@zuhnb712.local.com> (from narkewoody@gmail.com on Tue Dec 4 00:17:25 2012)
On 12/04/2012 12:17:25 AM, Woody Wu wrote:
> Hi, list
>
> I am not sure this has something with kernel.
It doesn't.
> But the system I just
> generated cannot be reached from ping. It can ping outside, but if I
> ping it from outside, I just get "Destination Host Unreachable".
Some distributions' default firewall rules respond to icmp packets with
a host unreachable packet. This is a system/network administration
thing (iptables) and nothing to do with kernel development.
> I think there is not firewall in between,
There's a firewall built into linux, read the man page for the
"iptables" command. The "iptables-save" command dumps your entire
current ruleset to stdout so you can see what's in there. (You might
have to run it as root, I forget.)
https://help.ubuntu.com/community/IptablesHowTo
Rob
next prev parent reply other threads:[~2012-12-04 11:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-04 6:17 Woody Wu
2012-12-04 8:47 ` Alan Cox
2012-12-04 11:34 ` Rob Landley [this message]
2012-12-05 3:24 ` Woody Wu
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