SBB partially reachable via IPv6

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Nico Schottelius

20 Oct 2019 20 Oct '19

8:40 p.m.

Hello everyone,

if anyone from SBB reads the swinog ml: it's very cool that you added an AAAA record to sbb.ch. However it seems that only the HTTP, but not the HTTPS port is open via IPv6. Logs are attached below.

Best regards from Glarus,

Nico

[20:31] diamond:~% curl -6 -I -v https://sbb.ch * Trying 2a00:4bc0:ffff:ffff::c296:f58e:443... * TCP_NODELAY set * Connected to sbb.ch (2a00:4bc0:ffff:ffff::c296:f58e) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: none * TLSv1.3 (OUT), TLS handshake, Client hello (1): ^C

[20:33] diamond:~% curl -6 -I -v http://sbb.ch * Trying 2a00:4bc0:ffff:ffff::c296:f58e:80... * TCP_NODELAY set * Connected to sbb.ch (2a00:4bc0:ffff:ffff::c296:f58e) port 80 (#0)

...

HEAD / HTTP/1.1 Host: sbb.ch User-Agent: curl/7.66.0 Accept: */*

* Mark bundle as not supporting multiuse < HTTP/1.1 301 Moved Permanently HTTP/1.1 301 Moved Permanently < Date: Sun, 20 Oct 2019 18:32:39 GMT Date: Sun, 20 Oct 2019 18:32:39 GMT < Server: Apache Server: Apache < Location: https://sbb.ch/ Location: https://sbb.ch/ < Content-Type: text/html; charset=iso-8859-1 Content-Type: text/html; charset=iso-8859-1

< * Connection #0 to host sbb.ch left intact

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Benoit Panizzon

21 Oct 21 Oct

9:40 a.m.

Works for me: $ telnet sbb.ch https Trying 2a00:4bc0:ffff:ffff::c296:f58e... Connected to sbb.ch.

$ openssl s_client -connect sbb.ch:https CONNECTED(00000003) depth=2 C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2 verify return:1 depth=1 C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 verify return:1 depth=0 jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch verify return:1 --- Certificate chain 0 s:jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch i:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 1 s:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 i:C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2

Mit freundlichen Grüssen

-Benoît Panizzon-

Silvan M. Gebhardt

9:58 a.m.

SBB is a test case for proper MTU. Check your MTU ;)

----- Ursprüngliche Mail ----- Von: "Benoit Panizzon" benoit.panizzon@imp.ch An: "swinog" swinog@lists.swinog.ch Gesendet: Montag, 21. Oktober 2019 07:40:15 Betreff: Re: [swinog] SBB partially reachable via IPv6

Works for me: $ telnet sbb.ch https Trying 2a00:4bc0:ffff:ffff::c296:f58e... Connected to sbb.ch.

Mit freundlichen Grüssen

-Benoît Panizzon-

-- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ swinog mailing list swinog@lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

Müller Urs (IT-OM-SDP-SDN)

11:21 a.m.

Hello everybody

We are still having issues with the MTU detection. At the moment, we are translating on our Internet-Router and internal Loadbalancers are unaware or unable to talk back to the webserver, if the MTU is smaller than usual. This happens usually with Tunnelbrokers or some (self built) Firewall/Routers.

Hope, we will bring IPv6 deeper into our network until Q2/2020 and fix that nasty issue with that.

If Nico could try to look into his MTU and perhaps share it's hardware specs?

I am connecting with EdgeRouter Pro and through INIT7/Fiber7.

:~$ curl -6 -l -v https://sbb.ch * Rebuilt URL to: https://sbb.ch/ * Trying 2a00:4bc0:ffff:ffff::c296:f58e... * TCP_NODELAY set * Connected to sbb.ch (2a00:4bc0:ffff:ffff::c296:f58e) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs * SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 * ALPN, server accepted to use http/1.1 * Server certificate: * subject: jurisdictionC=CH; jurisdictionST=Bern; serialNumber=CHE-102.909.703; businessCategory=Private Organization; C=CH; ST=Bern; L=Bern; O=Schweizerische Bundesbahnen SBB; OU=IT; CN=www.sbb.ch * start date: Jul 25 14:52:45 2019 GMT * expire date: Jul 25 14:52:45 2021 GMT * subjectAltName: host "sbb.ch" matched cert's "sbb.ch" * issuer: C=CH; O=SwissSign AG; CN=SwissSign EV Gold CA 2014 - G22 * SSL certificate verify ok.

Regards, Urs

Urs Müller Schweizerische Bundesbahnen SBB Senior Architekt IT Operations Management - Service Design Lindenhofstrasse 1 - Worblaufen, 3000 Bern 65 urs.bf.mueller@sbb.ch / www.sbb.ch

-----Ursprüngliche Nachricht----- Von: swinog-bounces@lists.swinog.ch swinog-bounces@lists.swinog.ch Im Auftrag von Silvan M. Gebhardt Gesendet: Montag, 21. Oktober 2019 09:59 An: Benoit Panizzon benoit.panizzon@imp.ch Cc: swinog swinog@lists.swinog.ch Betreff: Re: [swinog] SBB partially reachable via IPv6

SBB is a test case for proper MTU. Check your MTU ;)

Works for me: $ telnet sbb.ch https Trying 2a00:4bc0:ffff:ffff::c296:f58e... Connected to sbb.ch.

Mit freundlichen Grüssen

-Benoît Panizzon-

Matthias Cramer

12:24 p.m.

Hi All

What helped me with MTU issuer in general is setting TCPMSS on all traffic... This can be done under linux as follows:

ip6tables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1360 ip6tables-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu ip6tables-A OUTPUT -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

Just my two cents

Matthias

On 21/10/2019 11:21, Müller Urs (IT-OM-SDP-SDN) wrote:

...

Hello everybody

We are still having issues with the MTU detection. At the moment, we are translating on our Internet-Router and internal Loadbalancers are unaware or unable to talk back to the webserver, if the MTU is smaller than usual. This happens usually with Tunnelbrokers or some (self built) Firewall/Routers.

Hope, we will bring IPv6 deeper into our network until Q2/2020 and fix that nasty issue with that.

If Nico could try to look into his MTU and perhaps share it's hardware specs?

I am connecting with EdgeRouter Pro and through INIT7/Fiber7.

:~$ curl -6 -l -v https://sbb.ch

Rebuilt URL to: https://sbb.ch/

Trying 2a00:4bc0:ffff:ffff::c296:f58e...

TCP_NODELAY set

Connected to sbb.ch (2a00:4bc0:ffff:ffff::c296:f58e) port 443 (#0)

ALPN, offering h2

ALPN, offering http/1.1

successfully set certificate verify locations:

CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs

SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384

ALPN, server accepted to use http/1.1

Server certificate:

subject: jurisdictionC=CH; jurisdictionST=Bern; serialNumber=CHE-102.909.703; businessCategory=Private Organization; C=CH; ST=Bern; L=Bern; O=Schweizerische Bundesbahnen SBB; OU=IT; CN=www.sbb.ch

start date: Jul 25 14:52:45 2019 GMT

expire date: Jul 25 14:52:45 2021 GMT

subjectAltName: host "sbb.ch" matched cert's "sbb.ch"

issuer: C=CH; O=SwissSign AG; CN=SwissSign EV Gold CA 2014 - G22

SSL certificate verify ok.

Regards, Urs

Urs Müller Schweizerische Bundesbahnen SBB Senior Architekt IT Operations Management - Service Design Lindenhofstrasse 1 - Worblaufen, 3000 Bern 65 urs.bf.mueller@sbb.ch / www.sbb.ch

-----Ursprüngliche Nachricht----- Von: swinog-bounces@lists.swinog.ch swinog-bounces@lists.swinog.ch Im Auftrag von Silvan M. Gebhardt Gesendet: Montag, 21. Oktober 2019 09:59 An: Benoit Panizzon benoit.panizzon@imp.ch Cc: swinog swinog@lists.swinog.ch Betreff: Re: [swinog] SBB partially reachable via IPv6

SBB is a test case for proper MTU. Check your MTU ;)

----- Ursprüngliche Mail ----- Von: "Benoit Panizzon" benoit.panizzon@imp.ch An: "swinog" swinog@lists.swinog.ch Gesendet: Montag, 21. Oktober 2019 07:40:15 Betreff: Re: [swinog] SBB partially reachable via IPv6

Works for me: $ telnet sbb.ch https Trying 2a00:4bc0:ffff:ffff::c296:f58e... Connected to sbb.ch.

$ openssl s_client -connect sbb.ch:https CONNECTED(00000003) depth=2 C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2 verify return:1 depth=1 C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 verify return:1 depth=0 jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch verify return:1

Certificate chain 0 s:jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch i:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 1 s:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 i:C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2

Mit freundlichen Grüssen

-Benoît Panizzon-

-- Matthias Cramer / mc322-ripe Senior Network & Security Engineer iway AG Phone +41 43 500 1111 Badenerstrasse 569 Fax +41 44 271 3535 CH-8048 Zürich http://www.iway.ch/ GnuPG 1024D/2D208250 = DBC6 65B6 7083 1029 781E 3959 B62F DF1C 2D20 8250

Nico Schottelius

12:31 p.m.

Good late morning,

All fixed by now - I was notified that ipv6/https was unreachable due to maintenance at SBB last night.

curl -6 -I -v https://sbb.ch as well as a real browser now work again.

Thanks everyone for the fast response!

Sunny greetings from Glarus,

Nico

p.s.: MTU on my test boxes was 9000 and 1500, both had the same issue yesterday.

Müller Urs (IT-OM-SDP-SDN) urs.bf.mueller@sbb.ch writes:

...

Hello everybody

We are still having issues with the MTU detection. At the moment, we are translating on our Internet-Router and internal Loadbalancers are unaware or unable to talk back to the webserver, if the MTU is smaller than usual. This happens usually with Tunnelbrokers or some (self built) Firewall/Routers.

Hope, we will bring IPv6 deeper into our network until Q2/2020 and fix that nasty issue with that.

If Nico could try to look into his MTU and perhaps share it's hardware specs?

I am connecting with EdgeRouter Pro and through INIT7/Fiber7.

:~$ curl -6 -l -v https://sbb.ch

Rebuilt URL to: https://sbb.ch/

Trying 2a00:4bc0:ffff:ffff::c296:f58e...

TCP_NODELAY set

Connected to sbb.ch (2a00:4bc0:ffff:ffff::c296:f58e) port 443 (#0)

ALPN, offering h2

ALPN, offering http/1.1

successfully set certificate verify locations:

CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs

SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384

ALPN, server accepted to use http/1.1

Server certificate:

subject: jurisdictionC=CH; jurisdictionST=Bern; serialNumber=CHE-102.909.703; businessCategory=Private Organization; C=CH; ST=Bern; L=Bern; O=Schweizerische Bundesbahnen SBB; OU=IT; CN=www.sbb.ch

start date: Jul 25 14:52:45 2019 GMT

expire date: Jul 25 14:52:45 2021 GMT

subjectAltName: host "sbb.ch" matched cert's "sbb.ch"

issuer: C=CH; O=SwissSign AG; CN=SwissSign EV Gold CA 2014 - G22

SSL certificate verify ok.

Regards, Urs

Urs Müller Schweizerische Bundesbahnen SBB Senior Architekt IT Operations Management - Service Design Lindenhofstrasse 1 - Worblaufen, 3000 Bern 65 urs.bf.mueller@sbb.ch / www.sbb.ch

-----Ursprüngliche Nachricht----- Von: swinog-bounces@lists.swinog.ch swinog-bounces@lists.swinog.ch Im Auftrag von Silvan M. Gebhardt Gesendet: Montag, 21. Oktober 2019 09:59 An: Benoit Panizzon benoit.panizzon@imp.ch Cc: swinog swinog@lists.swinog.ch Betreff: Re: [swinog] SBB partially reachable via IPv6

SBB is a test case for proper MTU. Check your MTU ;)

----- Ursprüngliche Mail ----- Von: "Benoit Panizzon" benoit.panizzon@imp.ch An: "swinog" swinog@lists.swinog.ch Gesendet: Montag, 21. Oktober 2019 07:40:15 Betreff: Re: [swinog] SBB partially reachable via IPv6

Works for me: $ telnet sbb.ch https Trying 2a00:4bc0:ffff:ffff::c296:f58e... Connected to sbb.ch.

$ openssl s_client -connect sbb.ch:https CONNECTED(00000003) depth=2 C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2 verify return:1 depth=1 C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 verify return:1 depth=0 jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch verify return:1

Certificate chain 0 s:jurisdictionC = CH, jurisdictionST = Bern, serialNumber = CHE-102.909.703, businessCategory = Private Organization, C = CH, ST = Bern, L = Bern, O = Schweizerische Bundesbahnen SBB, OU = IT, CN = www.sbb.ch i:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 1 s:C = CH, O = SwissSign AG, CN = SwissSign EV Gold CA 2014 - G22 i:C = CH, O = SwissSign AG, CN = SwissSign Gold CA - G2

Mit freundlichen Grüssen

-Benoît Panizzon-

-- Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch

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participants (5)

Benoit Panizzon
Matthias Cramer
Müller Urs (IT-OM-SDP-SDN)
Nico Schottelius
Silvan M. Gebhardt