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#1190 worksforme Web access problems in hotel room Clemens Schrimpe rgm@…

On SSID IETF-Hotel. I did not suspend my system when last on the meeting room network, but took the elevator to my room 872.

This has happened a couple other times. Web access times out.

"The server at is taking too long to respond."

But other sites like work fine. And I got to this ticket site.

My IP address is:

inet brd scope global dynamic wlp4s0

valid_lft 931sec preferred_lft 931sec

inet6 2001:67c:1232:144:b240:1e3c:a4e8:451b/64 scope global noprefixroute dynamic

I will probably have to go down to the terminal room...

#1189 not broken Re: ESSIDs at IETF 100 jim@… alexandre.petrescu@…
For now I copy tickets @ and remove 6MAN WG list from
subsequent follow-ups.

One ticket: I connected on ietf-v6only some years ago and since then I
got a DNS IPv6 resolver name frozen in my Windows.  That makes that my
computer some times issues IPv6 DNS requests on other networks that are,
err... "IPv4 only".  That is worrying for the network protectors.   I
would like to no longer get such DNS IPv6 address frozen in my Windows
whenever I travel to IETF, thank you.

Second ticket: the IETF ESSIDs are friendly to MAC users and 
non-friendly to Windows users.

Third ticket: security: the steps of "Uncheck Validated Server Sert" and 
of the use of a public ietf/ietf username/password, and the use of a 
binary IETF WiFi manager at unknown to Symantec is highly 

Details below.


Le 14/11/2017 à 08:31, joel jaeggli a écrit :
> On 11/14/17 14:59, Alexandre Petrescu wrote:
>> Le 14/11/2017 à 07:24, Warren Kumari a écrit : [...]
>>> ​Nope. We have the legacy SSIDs because some people apparently
>>> had issues connecting to encrypted SSIDs (because of old OS /
>>> broken wpa_supplicant, etc) - this wasn't issue with certs, but
>>> rather providing a solution for those who are unable to do WPA
>>> enterprise / have old cards, etc.
>> Well - sorry, but all these reasons seem light for me.
>> I have Windows 7 which is not old.  Updated regularly from
>> Microsoft and from employer IT.
> Mainstream support ended January 13, 2015. It works, if you were
> looking for a more streamlined experience, the user experience has
> improved a bit since then, it has not been backported.

It's good to know.

I am more conservative than streamlined in terms of computer use.  Just
as "ls" and "cp" stay same, the Windows experience should stay same.

>> The WPA_supplicant comes from original.  It is widely accepted at
>> many other hotspots.
>> My laptop is very well able to do WPA enterprise, and WPA2
>> Enterprise.
>> The laptop is a Dell E7440, 2 or 3 years old.  I dont accept to
>> call that old.  What makes laptops old is when they break; they
>> often break because of mechanically moving parts like hd, but this
>> one is SSD.
>> Rather, I suspect there is a preference at the Access Point to
>> favorise Macintosh variations of WiFi Clients, rather than
>> Windows.
> There's no obvious basis for that assertion.

See below.  Basically: why the Windows users must do some manipulation
in order to make it work, but the Mac users no?  That's preference.

>> I also wonder why my Windows complains that the cert emmitted by
>> IETF is "not configured as a valid anchor".  Should I manually
>> install that cert?  If so, that is little reasonable to ask.

I think the page needs could be improved.  It does not detail
"ietf-hotel" in the table, it says "5GHz" where it should say "5.4", etc.

The Windows pdf says either "ietf" or "ietf-2.4ONLY".  It does not say 

The Windows pdf says at last page "Click here" on the "Configure next to 
Secured password (EAP-...)" but it does not say you should continue and 
further uncheck "Use Automatically my Windows Username and Password". 
If you dont do that the connection does not work.

The worst is that the Windows pdf says "Uncheck this box 'Validate 
Server Certificate".  And then recommends to use username password 
ietf/ietf published on a public web page.

Is it ok to _not_ validate Server Certificates?

Is it ok to encrypt with a password that everyone knows?

They only ask this manipulation for Windows, not for Mac.  This is a
sign the AP gives preference to Mac users.  BEcause the MAC users dont 
have to do anything about this.

If I were to configure APs at IETF I would give equal preference to 
every OS : no need to update drivers check boxes install software.


Thanks again, I downloaded it.  It's for Windows.  Why not for Mac?

Right after download, my Enterprise anti-virus Symantec claims it has
not enough information to ensure it's good.  Some reputation alert 
saying Symantec never saw this file (attached).  So I dont trust it.

I can trust the logo IETF puts on that page, trust the fact that it 
mixes French and English, but mechanically speaking, the mechanism does 
not inspire confidence.

> Cher utilisateur de IETF,
> Now that you have downloaded and installed a client configurator, all
> you need to do is find a IETF hotspot in your vicinity and enter your
> user credentials (this is our fancy name for 'username and password'
> or 'personal certificate') - and be online!

I dont have a 'personal certificate', where can I get one?

> Quelque soit le problème que vous pourriez éventuellement rencontrer,
> ou pour totu autre renseignement, veuillez contacter le centre de
           ^^^^ tout
> support de IETF. Ils diagnostiqueront le problème ou vous apporteront
> toute autre aide qui pourrait être nécessaire. Vous pouvez les
> joindre en utilisant l'un des moyens décrits ci dessus.

It leads to this

Needs to log in...

(who once got a virus through Bluetooth at an IETF meeting :-)

>> Alex
>>> There was an assertion made that some people were not using
>>> nat64 and were using ietf-legacy were easier, and so there should
>>> be parity, and so the ietf-nat64-unencrypted was created. We are
>>> changing the name of the ietf-legacyXXX network at each meeting 
>>> because we don't people who connected to it at a previous meeting
>>> to become sticky to it and keep joining -- it requires a specific
>>> action at each meeting for the user to choose the unencrypted
>>> network -- we'd all prefer that people use the encrypted
>>> network...
>>> And yes, my VPN FortiClient works ok on ietf-nat64-unencrypted.
>>> Alex
>>> --------------------------------------------------------------------
IETF IPv6 working group mailing list
>>> <> Administrative Requests:
>>> <> 
>>> --------------------------------------------------------------------
>>> I don't think the execution is relevant when it was obviously a
>>> bad idea in the first place. This is like putting rabid weasels
>>> in your pants, and later expressing regret at having chosen those
>>> particular rabid weasels and that pair of pants. ---maf
>> --------------------------------------------------------------------
IETF IPv6 working group mailing list
>> Administrative Requests:
>> --------------------------------------------------------------------


#1187 pending ipv6 temp address rotation(?) on win10 breaks long-lived connections panda@… tapio.sokura@…

My problem probably isn't due to the ietf-nat64 network, as I've seen 
this happen in other v6 enabled networks as well, but here goes anyway 
as a FYI:

I'm using the ietf-nat64 wifi with a Windows 10 (1709 update) client and 
my long-lived v6-tcp connections like ssh (putty client with keepalive 
set) tend to hang after some time. This has also happened to me reguarly 
on earlier versions of Windwows. For the hangup to occur it usually 
takes between tens of minutes to about an hour or two. After I login to 
the same host again, I see the v6 address I'm coming from has changed 
from the previous address.

So it looks like windows, for some reason or another, is disabling the 
old temp v6 addresses while there still are tcp connections open. It 
should not work like this, but I guess it could just be a feature in 

Other than long-lived tcp connections breaking for me, the nat64 network 
seems to be working fine. Maybe you could switch within the next couple 
of meetings to a v6 / nat64 mode on the default "ietf" network and 
provide native v4 only on a non-default ssid.

Here's an excerpt from an ipv6 enabled server log (timestamps utc+2):
Nov 14 07:31:47 rerun sshd[29389]: Accepted publickey for oh2kku from 
2001:67c:370:1998:e0f2:6c45:5267:eccb port 49682 ssh2
Nov 14 07:43:16 rerun sshd[29464]: Accepted publickey for oh2kku from 
2001:67c:370:1998:e0f2:6c45:5267:eccb port 49271 ssh2
Nov 14 08:01:32 rerun sshd[29600]: Accepted publickey for oh2kku from 
2001:67c:370:1998:f8f8:3610:14ed:9171 port 49309 ssh2
Nov 14 09:50:38 rerun sshd[29996]: Accepted publickey for oh2kku from 
2001:67c:370:1998:f8f8:3610:14ed:9171 port 63756 ssh2
Nov 14 10:21:35 rerun sshd[30090]: Accepted publickey for oh2kku from 
2001:67c:370:1998:b8f2:7bcf:5b90:7771 port 57115 ssh2
Nov 14 11:00:14 rerun sshd[30214]: Accepted publickey for oh2kku from 
2001:67c:370:1998:c834:4990:2112:ba9b port 55005 ssh2

This is from a v4-only server log, probably only the second last line 
was from a connection terminated due to address change:
2017-11-14T07:51:40.270398+02:00 woodstock sshd[28904]: Accepted 
publickey for oh2kku from port 49279 ssh2
2017-11-14T10:34:23.665509+02:00 woodstock sshd[3739]: Accepted 
publickey for oh2kku from port 53071 ssh2
2017-11-14T10:55:40.395275+02:00 woodstock sshd[4780]: Accepted 
publickey for oh2kku from port 49939 ssh2
2017-11-14T11:13:12.825515+02:00 woodstock sshd[5609]: Accepted 
publickey for oh2kku from port 55528 ssh2

This is what "ipconfig /all" on windows said a moment ago:

Wireless LAN adapter Wi-Fi:

    Connection-specific DNS Suffix  . :
    Description . . . . . . . . . . . : Intel(R) Dual Band Wireless-AC 7265
    Physical Address. . . . . . . . . : 10-02-B5-92-63-05
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IPv6 Address. . . . . . . . . . . : 
    Temporary IPv6 Address. . . . . . : 
    Link-local IPv6 Address . . . . . : 
    Autoconfiguration IPv4 Address. . :
    Subnet Mask . . . . . . . . . . . :
    Default Gateway . . . . . . . . . : fe80::1998:1%10
    DHCPv6 IAID . . . . . . . . . . . : 168821429
    DHCPv6 Client DUID. . . . . . . . : 
    DNS Servers . . . . . . . . . . . : 2001:67c:370:229::7
    NetBIOS over Tcpip. . . . . . . . : Enabled
    Connection-specific DNS Suffix Search List :

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