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Re: Test your connectivity for World IPv6 Day
 

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remi.despres at free

Jun 7, 2011, 8:10 AM


Views: 2416
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Re: Test your connectivity for World IPv6 Day [In reply to]

Le 7 juin 2011 à 15:56, Tore Anderson a écrit :
>> ...
>>> For real deployments, on the other hand ... well, I'm hoping no
>>> serious ISP or content provider will willingly put their end users
>>> or web sites behind MTU-impaired links or tunnels. Recipe for
>>> disaster if you ask me.
>>
>> What do you mean, precisely, by "MTU-impaired links or tunnels"?
>
> If an ISP, a tunnel broker, or a concious tunnel-using end user are
> using a link/tunnel that has a MTU lower than 1500 but where PMTUD does
> not work reliably, that is their problem, not mine.

A tunnel supporting less than 1500 must indeed return ICMP PTB messages like any tunnel.

But if the source host has a firewall that filters inbound ICMPv6 messages, this becomes this host's problem.
It becomes also a problem of hosts it communicates with although these hosts have no responsibility in the problem.

This host avoids the problem if it works with an "effective MTU for sending" of 1280 for off-link destinations, except for paths where PMTUD has detected better values.

> I refuse to work
> around their defective network by crippling the MTU for all my visitors.

In my understanding, it isn't a problem of defective ISP network.
It is a problem of uncertain effectiveness, so far, of PMTUD (worse in UDP than in TCP, and aggravated where some firewalls unduly filter ICMPv6 messages).

>
> What MTU do you recommend for IPv4 servers, by the way? 576 or 68?

As you of course know, despite this ironic question, the problem comes up in IPv6 because routers can no longer fragment packets.


Regards,
RD


>
> --
> Tore Anderson
> Redpill Linpro AS - http://www.redpill-linpro.com/
> Tel: +47 21 54 41 27

Subject User Time
Test your connectivity for World IPv6 Day mir at ripe May 27, 2011, 1:58 AM
    Re: Test your connectivity for World IPv6 Day doachs at gac May 27, 2011, 12:29 PM
        Re: Test your connectivity for World IPv6 Day ryanczak at gmail May 27, 2011, 12:33 PM
            RE: Test your connectivity for World IPv6 Day cholzhauer at sscorp May 27, 2011, 12:35 PM
        Re: Test your connectivity for World IPv6 Day jkirby at datawareservices May 27, 2011, 12:47 PM
        RE: Test your connectivity for World IPv6 Day Alan.Strand at HickoryTech May 27, 2011, 12:58 PM
            Re: Test your connectivity for World IPv6 Day jay at west May 27, 2011, 1:06 PM
        RE: Test your connectivity for World IPv6 Day paul at paulstewart May 27, 2011, 1:35 PM
        Re: Test your connectivity for World IPv6 Day sethm at rollernet May 27, 2011, 1:42 PM
        Re: Test your connectivity for World IPv6 Day doachs at gac May 27, 2011, 2:37 PM
            RE: Test your connectivity for World IPv6 Day frnkblk at iname May 27, 2011, 10:02 PM
            RE: Test your connectivity for World IPv6 Day frnkblk at iname May 27, 2011, 10:02 PM
        Re: Test your connectivity for World IPv6 Day achatz at forthnet May 30, 2011, 1:48 AM
            Re: Test your connectivity for World IPv6 Day achatz at forthnet May 30, 2011, 3:21 AM
            Re: Test your connectivity for World IPv6 Day achatz at forthnet Jun 1, 2011, 9:04 AM
                RE: Test your connectivity for World IPv6 Day Guillaume.Leclanche at swisscom Jun 1, 2011, 9:28 AM
        RE: Re: Test your connectivity for World IPv6 Day frnkblk at iname Jun 6, 2011, 5:41 AM
    Re: Test your connectivity for World IPv6 Day grant.moritz at avcon May 27, 2011, 9:24 PM
        Re: Test your connectivity for World IPv6 Day brian.e.carpenter at gmail May 27, 2011, 9:47 PM
            Re: Test your connectivity for World IPv6 Day cb.list6 at gmail May 27, 2011, 10:05 PM
    Re: Test your connectivity for World IPv6 Day dr at cluenet May 28, 2011, 7:58 AM
        Re: Test your connectivity for World IPv6 Day dr at cluenet May 28, 2011, 11:17 AM
        Re: Test your connectivity for World IPv6 Day sm at resistor May 28, 2011, 6:10 PM
            Re: Test your connectivity for World IPv6 Day pekkas at netcore May 29, 2011, 10:58 PM
                Re: Test your connectivity for World IPv6 Day sm at resistor May 29, 2011, 11:32 PM
                    Re: Test your connectivity for World IPv6 Day bjorn at mork May 30, 2011, 12:18 AM
                        Re: Test your connectivity for World IPv6 Day sesse at google May 30, 2011, 12:27 AM
                        Re: Test your connectivity for World IPv6 Day sm at resistor May 30, 2011, 3:40 AM
                Re: Test your connectivity for World IPv6 Day sander at steffann May 30, 2011, 1:39 AM
                Re: Test your connectivity for World IPv6 Day brian.e.carpenter at gmail May 30, 2011, 2:52 PM
        Re: Test your connectivity for World IPv6 Day dr at cluenet May 29, 2011, 11:15 AM
            Re: Test your connectivity for World IPv6 Day sethm at rollernet Jun 1, 2011, 9:53 AM
                Re: Test your connectivity for World IPv6 Day dr at cluenet Jun 2, 2011, 2:04 AM
                    Re: Test your connectivity for World IPv6 Day jared at puck Jun 3, 2011, 4:53 AM
                        Re: Test your connectivity for World IPv6 Day owens at nysernet Jun 5, 2011, 3:00 PM
                            Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 6, 2011, 8:58 AM
                                RE: Test your connectivity for World IPv6 Day Guillaume.Leclanche at swisscom Jun 6, 2011, 9:44 AM
                                Re: Test your connectivity for World IPv6 Day fred at cisco Jun 6, 2011, 9:55 AM
                                    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 6, 2011, 1:26 PM
                                        Re: Test your connectivity for World IPv6 Day fred at cisco Jun 6, 2011, 1:49 PM
                                            Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 1:44 AM
                                RE: Test your connectivity for World IPv6 Day evyncke at cisco Jun 6, 2011, 12:38 PM
                                Re: Test your connectivity for World IPv6 Day dr at cluenet Jun 6, 2011, 12:41 PM
                                    Re: Test your connectivity for World IPv6 Day ignatios at cs Jun 7, 2011, 12:39 AM
                                    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 3:30 AM
                                        Re: Test your connectivity for World IPv6 Day nanog at 85d5b20a518b8f6864949bd940457dc124746ddc Jun 7, 2011, 5:29 AM
                                            Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 8:31 AM
                                                Re: Test your connectivity for World IPv6 Day sthaug at nethelp Jun 7, 2011, 8:43 AM
                                                Re: Test your connectivity for World IPv6 Day nanog at 85d5b20a518b8f6864949bd940457dc124746ddc Jun 7, 2011, 10:50 AM
                                                Re: Test your connectivity for World IPv6 Day gert at space Jun 7, 2011, 1:03 PM
                                                    RE: Test your connectivity for World IPv6 Day gbonser at seven Jun 7, 2011, 7:50 PM
                                                    Re: Test your connectivity for World IPv6 Day achatz at forthnet Jun 7, 2011, 10:14 PM
                                                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 7, 2011, 10:22 PM
                                                            Re: Test your connectivity for World IPv6 Day achatz at forthnet Jun 7, 2011, 10:57 PM
                                                                Re: Test your connectivity for World IPv6 Day vvraciu at iasi Jun 7, 2011, 11:19 PM
                                                                RE: Test your connectivity for World IPv6 Day ipv6-ops-cluenet at remy-fr Jun 8, 2011, 12:20 AM
                                                            Re: Test your connectivity for World IPv6 Day sthaug at nethelp Jun 8, 2011, 1:42 AM
                                                                Re: Test your connectivity for World IPv6 Day ignatios at cs Jun 8, 2011, 2:38 AM
                            RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 4:28 AM
                                Re: Test your connectivity for World IPv6 Day daniel at shunoshu Jun 8, 2011, 4:31 AM
                                    RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 4:51 AM
                                    Re: Test your connectivity for World IPv6 Day he at nordu Jun 8, 2011, 4:59 AM
                                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 5:07 AM
                                            Re: Test your connectivity for World IPv6 Day tjc at ecs Jun 8, 2011, 5:47 AM
                                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 5:07 AM
                                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 5:08 AM
                                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 8, 2011, 5:08 AM
                                Re: Test your connectivity for World IPv6 Day adurand at juniper Jun 8, 2011, 4:35 AM
                                Re: Test your connectivity for World IPv6 Day owens at nysernet Jun 8, 2011, 6:41 AM
                    Re: Test your connectivity for World IPv6 Day dkluge at acm Jun 5, 2011, 2:04 PM
                        Re: Test your connectivity for World IPv6 Day jared at puck Jun 5, 2011, 5:30 PM
                        Re: Test your connectivity for World IPv6 Day owens at nysernet Jun 5, 2011, 7:59 PM
                            Re: Test your connectivity for World IPv6 Day dr at cluenet Jun 6, 2011, 1:44 AM
    Re: Test your connectivity for World IPv6 Day visser at terena May 28, 2011, 8:06 AM
        Re: Test your connectivity for World IPv6 Day paul at timmins May 28, 2011, 8:12 AM
        RE: Test your connectivity for World IPv6 Day evyncke at cisco May 28, 2011, 8:27 AM
        Re: Test your connectivity for World IPv6 Day ek at google May 28, 2011, 10:26 AM
        Re: Test your connectivity for World IPv6 Day tjc at ecs May 28, 2011, 3:41 PM
        Re: Test your connectivity for World IPv6 Day sjvn at vna1 Jun 8, 2011, 10:28 AM
            Re: Test your connectivity for World IPv6 Day berni at birkenwald Jun 8, 2011, 10:33 AM
    Re: Test your connectivity for World IPv6 Day dr at cluenet May 28, 2011, 8:33 AM
        Re: Test your connectivity for World IPv6 Day cb.list6 at gmail May 28, 2011, 8:39 AM
    Re: Test your connectivity for World IPv6 Day tjc at ecs May 28, 2011, 4:27 PM
    Re: Test your connectivity for World IPv6 Day neufeind at gmx Jun 1, 2011, 9:32 AM
        Re: Test your connectivity for World IPv6 Day achatz at forthnet Jun 1, 2011, 11:11 AM
            Re: Test your connectivity for World IPv6 Day tjc at ecs Jun 2, 2011, 2:18 AM
    Re: Test your connectivity for World IPv6 Day jens.weibler at h-da Jun 6, 2011, 2:20 AM
        Re: Test your connectivity for World IPv6 Day thomas at cis Jun 6, 2011, 2:33 AM
    Re: Test your connectivity for World IPv6 Day ipv6-ops at c0mplx Jun 6, 2011, 5:47 AM
        Re: Test your connectivity for World IPv6 Day bzeeb-lists at lists Jun 6, 2011, 5:50 AM
    Re: Test your connectivity for World IPv6 Day gert at space Jun 6, 2011, 7:13 AM
        Re: Test your connectivity for World IPv6 Day fred at cisco Jun 6, 2011, 7:42 AM
    Re: Test your connectivity for World IPv6 Day erik at nygren Jun 6, 2011, 7:48 AM
        Re: Test your connectivity for World IPv6 Day ipv6-ops at c0mplx Jun 6, 2011, 7:54 AM
            Re: Test your connectivity for World IPv6 Day owens at nysernet Jun 6, 2011, 8:37 AM
            Re: Test your connectivity for World IPv6 Day lyle at lcrcomputer Jun 6, 2011, 11:39 AM
    Re: Test your connectivity for World IPv6 Day marc.blanchet at viagenie Jun 6, 2011, 9:47 AM
    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 6, 2011, 1:17 PM
        Re: Test your connectivity for World IPv6 Day tore.anderson at redpill-linpro Jun 6, 2011, 3:20 PM
            Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 12:27 AM
                Re: Test your connectivity for World IPv6 Day tore.anderson at redpill-linpro Jun 7, 2011, 6:56 AM
                    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 8:10 AM
                        Re: Test your connectivity for World IPv6 Day tore.anderson at redpill-linpro Jun 7, 2011, 9:11 AM
                            Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 10:18 AM
                        RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 7, 2011, 10:17 AM
    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 6, 2011, 1:29 PM
    Re: Test your connectivity for World IPv6 Day achatz at forthnet Jun 6, 2011, 2:34 PM
        Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 3:32 AM
            Re: Test your connectivity for World IPv6 Day mohacsi at niif Jun 7, 2011, 4:03 AM
    Re: Test your connectivity for World IPv6 Day marc.blanchet at viagenie Jun 7, 2011, 4:26 AM
        Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 4:55 AM
            Re: Test your connectivity for World IPv6 Day gert at space Jun 7, 2011, 4:59 AM
                RE: Test your connectivity for World IPv6 Day frnkblk at iname Jun 7, 2011, 10:14 AM
            Re: Test your connectivity for World IPv6 Day marc.blanchet at viagenie Jun 7, 2011, 5:07 AM
                Re: Test your connectivity for World IPv6 Day nanog at 85d5b20a518b8f6864949bd940457dc124746ddc Jun 7, 2011, 5:33 AM
                Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 7, 2011, 6:49 AM
    Re: Test your connectivity for World IPv6 Day ben at slopez Jun 8, 2011, 6:43 AM
        Re: Test your connectivity for World IPv6 Day ocl at gih Oct 7, 2011, 3:39 AM
            Re: Test your connectivity for World IPv6 Day ocl at gih Oct 7, 2011, 4:01 AM
            Re: Test your connectivity for World IPv6 Day jeroen at unfix Oct 7, 2011, 4:17 AM
                Re: Test your connectivity for World IPv6 Day ben at newnet Oct 7, 2011, 4:31 AM
    Re: Test your connectivity for World IPv6 Day wmaton at ryouko Jun 8, 2011, 7:04 AM
    Re: Test your connectivity for World IPv6 Day Niall.oReilly at ucd Jun 8, 2011, 7:57 AM
        Re: Test your connectivity for World IPv6 Day nick at foobar Jun 8, 2011, 8:06 AM
            Re: Test your connectivity for World IPv6 Day gavin.mccullagh at gcd Jun 8, 2011, 8:15 AM
                Re: Test your connectivity for World IPv6 Day jens.weibler at h-da Jun 8, 2011, 8:42 AM
        Re: Test your connectivity for World IPv6 Day dot at dotat Jun 8, 2011, 10:17 AM
    Re: Test your connectivity for World IPv6 Day remi.despres at free Jun 8, 2011, 8:34 AM
        Re: Test your connectivity for World IPv6 Day - Explanation? remi.despres at free Jun 9, 2011, 12:56 AM
            Re: Test your connectivity for World IPv6 Day - Explanation? thomas at cis Jun 9, 2011, 1:45 AM
                Re: Test your connectivity for World IPv6 Day - Explanation? remi.despres at free Jun 9, 2011, 9:05 AM
    Re: Test your connectivity for World IPv6 Day nick at foobar Jun 8, 2011, 12:21 PM
        Re: Test your connectivity for World IPv6 Day dot at dotat Jun 8, 2011, 12:31 PM
        Re: Test your connectivity for World IPv6 Day ignatios at cs Jun 9, 2011, 12:38 AM
    Re: Test your connectivity for World IPv6 Day martin at millnert Jun 8, 2011, 12:48 PM
    Re: Usage statistics of "World IPv6 Day Tools"? [was: Test your connectivity for World IPv6 Day] bzeeb-lists at lists Jun 10, 2011, 5:13 AM

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