Hi there!
I recently discovered that the linux kernel support Explicit Congestion
Notification and that a fully ecn enabled network would have virtually
no dropped packets.
Enabling that feature is a way to respect the infrastructure we use, and
servers, routers or firewalls not complying with regularly approved
standard like rfc 793 and 3168 are dammaging all of us, in a way not
very different from that of spammers.
Being able to discriminate between good and bad guys it is possible
through a filtering rule,
iptables -A POSTROUTING -t mangle -p tcp -d bad.guy.com -j ECN
--ecn-tcp-remove.
Many thanks to the guys who wrote the kernel support and the target!
This is not a solution of the problem, but at least gives you the power
to send an email the the system/network administrators and put that rule
in our ILLEGAL_HOST_AND_NETS_VIOLATING_RFC793 chain. Many of those hosts
simply do not have access to their routers' or firewalls' configuration.
Now, the problem is the rule seems not to be working and I cannot
connect to those hosts unless turning ecn off (echo 0 >
/proc/sys/net/ipv4/tcp_ecn), the wrong solution. I suspect I'm getting
something wrong.
Miciej Soltysiak had a similar probelm with an illegal box in his
network. Did you find a solution?
Please help. If I will solve this problem I promise that I will submit a
patch proposal to the LARTC's mantainers. That's the best I can do to
make people aware of this issue.
Thanks a lot.
Andrea
