Re: ARP ping instead of ICMP ping for gateway latency check ?

[Robin Roevens <robin.roevens@disroot.org>]

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Hi

Tracepath returns a few bogon IP's and then no-reply for the gateway
address.
And TCP ping is not available on IPFire, I think. tcptracepath of lft
comes to mind, but none of those are available on IPFire.

Robin

fairmont schreef op vr 25-04-2025 om 08:57 [-0600]:
> Have you tried tracepath since it uses UDP?
> 
> tracepath -4 -b <outside ipV4 address>
> or
> tracepath -6 -b <outside ipV6 address>
> or even
> tracepath -b www.google.com
> 
> TCP ping would be another method.
> 
> 
> On Tue, Apr 22, 2025 at 8:35 AM Michael Tremer
> <michael.tremer@ipfire.org> wrote:
> > Hello Robin,
> > 
> > > On 20 Apr 2025, at 23:52, Robin Roevens
> > <robin.roevens@disroot.org> wrote:
> > > 
> > > Hi All
> > > 
> > > I recently changed my internet provider and I noticed that both
> > the
> > > gateway graph on cgi-bin/netother.cgi and my Zabbix gateway ping
> > check
> > > no longer work.
> > 
> > Yes, some ISPs don’t respond do ICMP echo requests to the gateway.
> > I have no idea why really, but it is not uncommon.
> > 
> > > It seems that my current provider blocks ICMP pings on the
> > gateway
> > > address.
> > > So I was wondering if it wouldn't be better to use arping instead
> > of
> > > normal ping to check the latency of the gateway? This should
> > always
> > > works regardless of firewalls of the provider.. I think?
> > 
> > This is a good idea. An ARP ping should always work, because
> > otherwise there is no way to discover the layer 2 address of the
> > gateway. But that obviously only applies to internet connections
> > that actually use ARP. PPP connections don’t use ARP for example.
> > 
> > We are also using collectd which is using liboping and that only
> > supports ICMP.
> > 
> > > I can quite easily change this Zabbix check. But I'm not sure
> > about the
> > > graph on netother.cgi; I can look into that if you all think that
> > > change would be a good idea? Or if anyone could give me some
> > pointers
> > > on where to start looking?
> > 
> > I think so. It could be an option for the future.
> > 
> > If the gateway does not respond to pings, you should automatically
> > fall back to ping.ipfire.org <http://ping.ipfire.org/> though. So
> > the graph should always have some data to show.
> > 
> > Best,
> > -Michael
> > 
> > > 
> > > Regards
> > > Robin
> > > 
> > > -- 
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> > 
> > 
> 
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