[freenet-dev] Parallel negotiations

[Matthew Toseland]

Various odd errors recently (PacketSequenceException for example) seem to have 
been caused by running several JFK negotiations simultaneously and all of 
them succeeding. STS was stateful and therefore could only have one in 
flight, but JFK can have more than one. So one completes, then another 
completes; this exposed a bug which I fixed, but it is problematic as the 
second connection will clobber the first.

Options:
- 1) Introduce some state, resend the same message 2 after receiving the same 
message 1. Bad: memory DoS.
- 2) Ignore the problem. It works, don't fix it. Probably what we'll go with.
- 3) Stagger the sending of the phase 1 handshakes. The problem is that we may 
have to keep firewall tunnels open, so we have to send to each address every 
<30 secs. But there should be space within this to send to a few addresses...
- 4) Support multiple temporary connections. Drop according to a defined order 
in the noderef.
- 5) Support multiple permanent connections. Separate AIMD for each 
connection, so messages can be distributed according to whichever connection 
has the lowest RTT and has available bandwidth.

Any comments?
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