Re: [swinog] Swisscom IPv6 Routing weirdness

2021-02-26 Diskussionsfäden Gert Doering
Hi, On Fri, Feb 26, 2021 at 05:01:38PM +0100, Claudio Luck wrote: > Checksum errors are rather common to originate in virtualization > platforms. It is one of the things to check for when deploying new > infrastructure. Even some bigger resellers hand out VMs with these > problems: I occasional

Re: [swinog] Swisscom IPv6 Routing weirdness

2021-02-26 Diskussionsfäden Claudio Luck
On 26.02.21 12:29, Silvan M. Gebhardt wrote: > Isn't that the case with tcp_offload enabled in the NIC that tcpdump will see > incorrect checksums? > > > I'm by no means a tcpdump expert: > > Those incorrect checksums: are my systems generating incorrect checksums > or is it the swisscom s

Re: [swinog] Swisscom IPv6 Routing weirdness

2021-02-26 Diskussionsfäden Silvan M. Gebhardt
Isn't that the case with tcp_offload enabled in the NIC that tcpdump will see incorrect checksums? >>> I'm by no means a tcpdump expert: Those incorrect checksums: are my systems generating incorrect checksums or is it the swisscom side? It seems weird that different systems with different OS a

Re: [swinog] Swisscom IPv6 Routing weirdness

2021-02-26 Diskussionsfäden Benoît Panizzon
I don't seem to have problem from AS6772: $ openssl s_client -connect [2a02:a90:c400:5001::2]:https [ssh handshake stuff] GET / HTTP/1.0 HTTP/1.0 301 Moved Permanently Location: https://www.swisscom.ch/de/privatkunden.html Connection: close Content-Length: 252 [...] -- Mit freundlichen Grüssen

Re: [swinog] Swisscom IPv6 Routing weirdness

2021-02-26 Diskussionsfäden Jean-Pierre Schwickerath
Hi Jeroen There were two issues, one has been resolved, which was the routing issue I was seeing from one of the networks where I tested from. What remains is that I can't open a successful TCP connection to www.swisscom.ch on Port 443 when coming from a non-swisscom network. > Check with a tcpd