On 18/05/15 06:46, Mikael Abrahamsson wrote:
On Sun, 17 May 2015, Kevin Darbyshire-Bryant wrote:Thanks Mikael - some ECN tweakage in progress. I'll see which bits of the Internet I use break :-)I have been running this on my macbook for almost 2 years (since I got it):$ cat /etc/sysctl.conf net.inet.tcp.ecn_initiate_out=1 net.inet.tcp.ecn_negotiate_in=1 and this on my linux server for 5+ years: $ cat /etc/sysctl.conf | grep -i ecn net.ipv4.tcp_ecn = 1 I used the same on my previous Ubuntu based laptop for 5+ years.I have yet to encounter any ECN related breakage. I have had significant problems with IPv6 PMTUD blackholing, but no ECN related problems. I had ECN related problems back in 2001 (or whenever it was) when Linux first introduced it due to a lot of firewalls being very paranoid about it, but then I turned it back on again 5-7 years ago and by then all problems were gone.
That's good to know :-)And for those struggling (ok just me then) to get ecn to survive a reboot on OpenWrt despite playing with sysctl.conf, instead add "option tcp_ecn '1'" in /etc/config/firewall something like:
config defaults
option syn_flood '1'
option input 'ACCEPT'
option output 'ACCEPT'
option forward 'REJECT'
option drop_invalid '1'
option tcp_ecn '1'
Kevin (being that 'better built idiot' since 1971) :-)
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