Im a bit muddled about a few things concerning TCP_ECN support in linux
2.4 / 2.6 so would like a few pointers in the right direction etc. etc.
I havent worked out who maintainers for such code is etc. or find out
the info I want in FAQs etc.
0: Seemingly, the TCP_ECN support in linux-2.6.8.1 is always included
(part of the main kernel source), is this true of all 2.6 versions
[or totally wrong of me to say that]) ?
1: I am particuarly interested in the following situation:
-Linux 2.4 or 2.6 with TCP_ECN support
-sysctl net/ipv4/tcp_ecn set to "0"
-ECN-aware TCP connection comes inbound to such linux box
i.e., ?what is the ECN-behaviour then?
-option 0: replies with ECN flags zeroed or copied such that
the remote TCP-initiator sees non-ecn-capable host, and
connection works in non-ECN-fashion.
-option 1: replies with ECN acknowledgement and follows
ECN congestion control (i.e. echoes Congestion-experienced
and takes note of congestion-occured notification).
2: ?does ipv6 use some 'native' congestion control notification,
such that 'extra bits in the TCP header' becomes redundant
for ipv6 ECN?
3: I have not found any mention of any way to find out which connections
are talking to a ECN-aware host[+network path] and which are talking
to a non-ECN-host. (let alone, query the kernel via common GNU
tools for this information). Please point me in the right direction,
anybody ;-).
?do any of the above vary between linux-2.4/linux2.6?
Thankyou in advance.
I do hope somebody out there can be enlightening ;-).
-S Iremonger <exxsi@bath.ac.uk>
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