On Thu, 19 Sep 2019 19:50:45 +0200 Toke Høiland-Jørgensen <[email protected]> wrote:
> Is anyone else experiencing problems negotiating ECN when connecting to > Cloudflare? I see this for most sites protected by Cloudflare (such as > bufferbloat.net), but only when using IPv4: > > # sysctl -w net.ipv4.tcp_ecn=1 > net.ipv4.tcp_ecn = 1 > # curl -v 1.1.1.1 > * Trying 1.1.1.1:80... > * TCP_NODELAY set > * Connected to 1.1.1.1 (1.1.1.1) port 80 (#0) > > GET / HTTP/1.1 > > Host: 1.1.1.1 > > User-Agent: curl/7.66.0 > > Accept: */* > > > * Recv failure: Connection reset by peer > * Closing connection 0 > curl: (56) Recv failure: Connection reset by peer It works for me when repeating your experiment: $ sysctl -w net.ipv4.tcp_ecn=1 net.ipv4.tcp_ecn = 1 $ curl -v 1.1.1.1 * Rebuilt URL to: 1.1.1.1/ * Trying 1.1.1.1... * TCP_NODELAY set * Connected to 1.1.1.1 (1.1.1.1) port 80 (#0) > GET / HTTP/1.1 > Host: 1.1.1.1 > User-Agent: curl/7.61.1 > Accept: */* > < HTTP/1.1 301 Moved Permanently < Date: Fri, 20 Sep 2019 07:19:48 GMT < Content-Type: text/html < Transfer-Encoding: chunked < Connection: keep-alive < Location: https://1.1.1.1/ < Served-In-Seconds: 0.000 < CF-Cache-Status: HIT < Age: 5944 < Expires: Fri, 20 Sep 2019 11:19:48 GMT < Cache-Control: public, max-age=14400 < Server: cloudflare < CF-RAY: 519208830aced891-CPH [...] > # sysctl -w net.ipv4.tcp_ecn=0 > net.ipv4.tcp_ecn = 0 > # curl -v 1.1.1.1 > * Trying 1.1.1.1:80... > * TCP_NODELAY set > * Connected to 1.1.1.1 (1.1.1.1) port 80 (#0) > > GET / HTTP/1.1 > > Host: 1.1.1.1 > > User-Agent: curl/7.66.0 > > Accept: */* > > > * Mark bundle as not supporting multiuse > < HTTP/1.1 301 Moved Permanently > < Date: Thu, 19 Sep 2019 17:42:22 GMT > < Content-Type: text/html > < Transfer-Encoding: chunked > < Connection: keep-alive > < Location: https://1.1.1.1/ > < Served-In-Seconds: 0.000 > < CF-Cache-Status: HIT > < Age: 4442 > < Expires: Thu, 19 Sep 2019 21:42:22 GMT > < Cache-Control: public, max-age=14400 > < Server: cloudflare > < CF-RAY: 518d5b13fcfcd43f-HAM > < > <html> > <head><title>301 Moved Permanently</title></head> > <body bgcolor="white"> > <center><h1>301 Moved Permanently</h1></center> > <hr><center>cloudflare-lb</center> > </body> > </html> > * Connection #0 to host 1.1.1.1 left intact > > > I've opened a support request with my ISP, but thought I'd ask if anyone > else was seeing this? (Is anyone else running with ECN enabled?) I'm not seeing it, so it might be your ISP? -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
