On Thu, Aug 16, 2012 at 1:13 PM, Tom Eastep <[email protected]> wrote:
> On 08/16/2012 09:39 AM, Tom Eastep wrote:
>
> > While what you did works fine, there is a more efficient way to handle
> this.
> >
> > Add this entry in /etc/shorewall/actions:
> >
> > Pings # Handle ping from the net
> >
> > Create /etc/shorewall/action.Pings with this single rule:
> >
> > ACCEPT $PINGDOM_PROBE_IPS
> >
> > Replace your entry in /etc/shorewall/rules with:
> >
> > Pings net $FW_PUB icmp echo-request
> >
> > The advantage with this approach is that only pings packets are passed
> > through the 30 rules that each compare one source ip address, while your
> > approach requires all new connection requests from the net to pass
> > through those rules (unless they have been handled by a rule earlier in
> > the file).
> >
> > An even more efficient way would be to use an ipset to define the
> > Pingdom IP addresses, but unless you are running a quite recent kernel,
> > that requires that you install the xtables-addons package.
>
> I corrected a couple of typos in the quoted text above.
>
> -Tom
> --
> Tom Eastep \ When I die, I want to go like my Grandfather who
> Shoreline, \ died peacefully in his sleep. Not screaming like
> Washington, USA \ all of the passengers in his car
> http://shorewall.net \________________________________________________
>
>
>
>
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Hi Tom,
Thanks a lot for the reply! I'm trying to apply the ipsets method as I have
a recent kernel. I'm running 3.4.2. I've figured out how to create an ipset
with the ipset create command. What I've done is created the ipset
called PINGDOM_PROBE_IPS shown here:
# ipset list
Name: PINGDOM_PROBE_IPS
Type: hash:ip
Header: family inet hashsize 1024 maxelem 65536
Size in memory: 8284
References: 0
Members:
188.138.118.184
188.138.124.110
What I don't understand if I can just reference this list directly in the
rules file? In other words is it as simple as:
Ping(ACCEPT) net:+PINGDOM_PROBE_IPS $FW_PUB
Thanks again for your help!
Aaron
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