I have.... your answer :)
$ telnet -6 www.swisscom.ch 80 Trying 2a02:a90:c400:5001::2... telnet: Unable to connect to remote host: Connection refused
same for 443. It takes a while for it to respond with a RST... which is a really cool one:
0000 52 54 00 b2 ca 34 cc 4e 24 45 ef 00 86 dd 60 00 RT...4.N$E....`. 0010 00 00 00 3d 06 2f 2a 02 0a 90 c4 00 40 01 00 00 ...=./*.....@... 0020 00 00 00 00 00 02 20 01 16 20 20 b0 00 00 00 00 ...... .. ..... 0030 00 00 00 00 00 55 01 bb ee 1c 00 00 00 00 c4 a0 .....U.......... 0040 ea f9 50 14 00 00 ff 13 00 00 42 49 47 2d 49 50 ..P.......BIG-IP 0050 3a 20 5b 30 78 32 62 33 38 30 62 35 3a 32 37 31 : [0x2b380b5:271 0060 5d 20 68 61 6e 64 73 68 61 6b 65 20 74 69 6d 65 ] handshake time 0070 6f 75 74 out
I guess that tells it all :)
The fun thing is, that is just a telnet (should have used netcat to ignore telnet attributes).
Greets, Jeroen
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On 20210309, at 10:49, Jean-Pierre Schwickerath swinog@hilotec.net wrote:
Hi Gregor
Thank you for your insights.
On 02.03.21 20:51, Gregor Riepl wrote:
I tried different ISPs to which I have access and I can't establish a IPv6 connection to port TCP/443 to neither 2a02:a90:c400:4001::2 nor 2a02:a90:c400:5001::2 which seems the two loadbalancers responsible for www.swisscom.ch except from a Swisscom Business DSL connection.
Init7 -> fail Strange, from AS13030 (Fiber7 residential), both IPs work fine.
I just tried it again from a customer with a Fiber7 access and I still can't open www.swisscom.ch neither in a browser edge / firefox on a windows machine, nor from wget on a linux server.
Perhaps something is wrong with your test client? Wrong MTU? OS issue? Did you try a different machine?
I tried from various windows and linux machines from our office (via netrics), from customers (fiber7) and from our datacenter (nts) and it's all the same - I use different routers, different OS versions.
My datacenter ISP (nts) suspects that it's a reverse path issue and advised me to use atlas probes to confirm.
I made two mesurement but the results show more successes that failure:
https://atlas.ripe.net/measurements/29275604/#probes
https://atlas.ripe.net/measurements/29275617/#probes
So maybe it's really only me and I have to live with the fact that I can't login to the swisscom website when v6 connectivity is enabled.
Strange thing is that I even found a swisscom sme fiber customer where the connection to https://www.swisscom.ch times out and one on a ip-plus fiber access. Maybe that's my best bet to open a ticket with their support.
It would be so much easier to debug if their webserver would answer to pings on v6.
I'll keep the list updated if I have any relevant news.
Best Regards and thanks again to all of you who spend some time on this issue already
Jean-Pierre
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