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Fri, 25 Apr 2025 07:58:01 -0700 (PDT) Precedence: list List-Id: List-Subscribe: , List-Unsubscribe: , List-Post: List-Help: Sender: Mail-Followup-To: MIME-Version: 1.0 References: In-Reply-To: From: fairmont Date: Fri, 25 Apr 2025 08:57:50 -0600 X-Gm-Features: ATxdqUEN2pVLYbXVwhE9r7gJSJu8FWJ9l0az5LYw2pzeKoHV88mHq6KasA7D_oA Message-ID: Subject: Re: ARP ping instead of ICMP ping for gateway latency check ? To: development@lists.ipfire.org Content-Type: multipart/alternative; boundary="0000000000008cdcb106339b8fd0" X-Rspamd-Server: mail01.haj.ipfire.org X-Rspamd-Queue-Id: 4ZkbYl2hsYz2k3 X-Spamd-Result: default: False [-6.33 / 11.00]; BAYES_HAM(-2.70)[98.68%]; R_DKIM_ALLOW(-1.68)[gmail.com:s=20230601]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM(-0.98)[-0.980]; DKIM_REPUTATION(-0.95)[-0.95131875033769]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; SPF_REPUTATION_HAM(-0.11)[-0.11068928956758]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; IP_REPUTATION_HAM(-0.10)[asn: 15169(-0.20), country: US(-0.01), ip: 2a00:1450:4864:20::(0.12)]; MX_GOOD(-0.01)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FUZZY_RATELIMITED(0.00)[rspamd.com]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; FREEMAIL_FROM(0.00)[gmail.com]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::533:from]; PREVIOUSLY_DELIVERED(0.00)[development@lists.ipfire.org]; TO_DN_NONE(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCVD_COUNT_ONE(0.00)[1]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; DKIM_TRACE(0.00)[gmail.com:+]; MISSING_XM_UA(0.00)[]; ARC_SIGNED(0.00)[lists.ipfire.org:s=202003rsa:i=1] X-Rspamd-Action: no action --0000000000008cdcb106339b8fd0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Have you tried tracepath since it uses UDP? tracepath -4 -b or tracepath -6 -b or even tracepath -b www.google.com TCP ping would be another method. On Tue, Apr 22, 2025 at 8:35=E2=80=AFAM Michael Tremer wrote: > Hello Robin, > > > On 20 Apr 2025, at 23:52, Robin Roevens > 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=E2=80=99t 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=E2=80=99t 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 though. So the graph > should always have some data to show. > > Best, > -Michael > > > > > Regards > > Robin > > > > -- > > Dit bericht is gescanned op virussen en andere gevaarlijke > > inhoud door MailScanner en lijkt schoon te zijn. > > > > > > > --0000000000008cdcb106339b8fd0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Have you tried tracepath since it=C2=A0uses 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=E2=80=AFAM Michael Tremer &l= t;michael.tremer@ipfire.org> wrote:
Hel= lo Robin,

> On 20 Apr 2025, at 23:52, Robin Roevens <robin.roevens@disroot.org> wrot= e:
>
> 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=E2=80=99t 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 ther= e is no way to discover the layer 2 address of the gateway. But that obviou= sly only applies to internet connections that actually use ARP. PPP connect= ions don=E2=80=99t use ARP for example.

We are also using collectd which is using liboping and that only supports I= CMP.

> I can quite easily change this Zabbix check. But I'm not sure abou= t 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<= br> > 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 bac= k to ping.ipfire.org <http://ping.ipfire.org/> though. So the grap= h should always have some data to show.

Best,
-Michael

>
> Regards
> Robin
>
> --
> Dit bericht is gescanned op virussen en andere gevaarlijke
> inhoud door MailScanner en lijkt schoon te zijn.
>
>


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