~dr|z3d
@RN
@RN_
@StormyCloud
@T3s|4
@T3s|4_
@eyedeekay
@not_bob
@orignal
@postman
@zzz
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dr|z3d
here you go, zzz, roadmap mods.. you only need to copy the <style> block and overwrite your current <style> block with it: cake.i2p/file/TDjsCosSkP_GurxlUNjOuUPX8XC3ozIHY8q5iCGMe_hFTqJHXFVX/zzz-plan.html
zzz
thx for the pnuts
RN
*** hands zzz an epi-pen ***
zzz
orignal, re: multiple relay responses sent from bob to alice
zzz
done some logging and looking
zzz
what I see is i2pd 0.9.64 alice repeatedly sending me a relay request with same nonce, AFTER I've sent the relay response
zzz
and forgotten about that nonce. so the next time I do it all again
zzz
sample:
zzz
11/02 17:32:43.213 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:43.251 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:43.328 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:43.373 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:43.565 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:43.605 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:43.885 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:43.924 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:44.293 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:44.333 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:44.830 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:44.869 Got relay response 0 as bob, forward nonce 2863524794
zzz
11/02 17:32:45.456 Receive relay request from 85.228.46.115:17214 j~EeS2
zzz
11/02 17:32:45.497 Got relay response 0 as bob, forward nonce 2863524794
zzz
so I think I'm doing everything right, except maybe I should remember and ignore old nonces?
zzz
but look at your 0.9.64 alice code
zzz
I don't see any logs or code where I 'spontaneously' send a bunch of them
orignal
so you respond to relay requests?
orignal
thanks. will check
orignal
do you send Ack to that relay request packet?
orignal
for me it seems that retrans
orignal
e.g. packet is not acked but you
orignal
shoudl I set set "ack requested" in flags?
zzz
no need to set flag
zzz
yes we ack relay requests; even if we didn't send a separate ack, there would be in ack block in the relay response
orignal
even if Data msg contains only relay request?
orignal
I think that's the problem
zzz
of course, we include ack blocks in every message
orignal
the question is if even send it
orignal
got it. it must be with relay response message
orignal
let me investigate deeper
zzz
this is a little confusing for sure
orignal
but if it's Alice it's easy to reproduce
orignal
the question is why I keep resending despite ack
orignal
and strange that it doesn't happen with peer test
orignal
althrough the same logic
zzz
I'm not logging the timestamp in the request, I'll do that, that should tell us if it's a retransmission or a new one with the same nonce
orignal
no doubts it's a restransimmission
orignal
because I generate nonce randomly
orignal
RAND_bytes ((uint8_t *)&nonce, 4);
orignal
for every relay request
zzz
ok
orignal
when you receive replay request do you send ack right a way or with relay response received from Charlie?
zzz
almost right away, delayed ~ RTT/6 which is way before the relay response usually
orignal
so you don't wait for RelayResponse from Charlie
zzz
correct
orignal
let me investigate put some logging and see
zzz
in the end I'll probably have to keep a recent relay request nonce list, because after I send the relay response I "forget" the nonce and can't recognize dups
zzz
even if there's no bugs on either side, it can happen
orignal
what is packet num is zero?
orignal
most likely I send relay request as first message
orignal
although it souldn't be
zzz
checked a few dups, first one is #5 on one, #8 on another, #24 on another
orignal
yes you are right I aslways recdeive Ack
dr|z3d
zzz: got a question for you. can't find the search code for leasesets, want to do a partial search instead of searching for the entire b32. any ideas where the code is? :)
zzz
same as for partial router hash. get them all, and iterate thru them
dr|z3d
yeah, I just can't find where we're doing the ls/b32/hostname search. must be blind.
zzz
sec
dr|z3d
thanks
dr|z3d
I figured it'd be useful to be able to input a partial b32 and get a result.
dr|z3d
or a partial hostname for that matter.
zzz
renderer.renderLeaseSet(Writer out, String hostname, boolean debug)
dr|z3d
ok, thanks, I recognise that, it's in NetDbRenderer.
orignal
hmm
orignal
what I see all these relay reponses come in the same second
zzz
you can see my timestamps in what I pasted above
orignal
yes, you also send in the same second
orignal
it seems my resend algoruthm
zzz
only because the dup requests come in pretty quickly
orignal
that's why it's definitly bug in my resend algorithm
zzz
my min retransmission timeout is 1 second
zzz
ok, you found something? good news
zzz
I'm adding some logging and dup checks, will have results tomorrow
orignal
not yet but it's clear that you send acks
zzz
ok
orignal
my retrans time is based on RTT
zzz
don't forget you've also made a lot of changes since the release? easy to lose track of whats what
orignal
see in case of I2NP you drop dupplicates
orignal
I'm trying trunk
orignal
and see bunch of RelayResponses
zzz
yeah, for relay and peer test the dup checks have to be in the state machine because they don't have i2np message numbers
orignal
will inverstiage why
orignal
anyway we know the reason now
zzz
normally I track dups but once I'm done with a test as Bob (when I send the relay response to alice), I delete all the state so I 'forget'
zzz
so that's what I need to improve
zzz
whether you have a bug or not...
zzz
adding a LRU cache of nonces
orignal
yes I delete nonce once I get reponse from Charlie too
orignal
const int SSU2_RESEND_ATTEMPT_MIN_INTERVAL = 3; // in milliseconds
orignal
ha ha
dr|z3d
!!
orignal
that's why
dr|z3d
you probably meant 3*1000?
zzz
yikes
dr|z3d
we've found a network spammer..
orignal
no. 3 ms
zzz
long delta = Math.max(10, Math.min(_rtt/6, ACK_FREQUENCY));
dr|z3d
no, I mean you *intended* 3*1000 when you wrote the code, but got it wrong.
orignal
do you have a problem with SSU2 spam?
zzz
rotected static final int ACK_FREQUENCY = 150;
not_bob
hah
orignal
3 ms was intende3d
orignal
it's just about initial resend interval
zzz
oh wait that's the delayed ack calc... stand by...
orignal
in reality it's based on RTO
RN
*** does Pee Wee Herman impression "I meant to do that" ***
orignal
americans who are you going to vote for Tuesday?
zzz
private static final int MIN_RTO = 1000;
orignal
I'm still checking
orignal
definitly the problem come for very first message when no RTO yet
zzz
private static final int INIT_RTO = 1000;
orignal
const size_t SSU2_INITIAL_RTO = 540; // in milliseconds
orignal
const size_t SSU2_MIN_RTO = 100; // in milliseconds
zzz
I know you guys have been playing around a lot with rtt/rto/retx in streaming. I continue to recommend sticking exactly with RFC 6298 both for streaming and SSU2
orignal
we diddn't changemuch in SSU2
zzz
and that is referenced in the ssu2 spec
zzz
6298 specifies 1 sec min RTO (as a SHOULD)
dr|z3d
what about for streaming?
dr|z3d
private static final int INITIAL_RTO = 9000;
zzz
same here
dr|z3d
no, I know that's what you've got, I'm asking if it's due a revision. I've got 5000 right now.
dr|z3d
just because 9000 seemed a bit high, but maybe it can go lower than 5?
orignal
according to zzz's log my RTO is around 100 ms
orignal
100 after first, 200 after second, 300 after third etc.
orignal
zzz, what's your ack interval? rtt/6?
orignal
look like your ack is always late
orignal
that's what happens
zzz
long delta = Math.max(10, Math.min(_rtt/6, ACK_FREQUENCY));
zzz
yeah. rtt/6, min 10, max 150
orignal
what it will be if rtt is 100 ms?
zzz
100/6
zzz
my median RTT is about 100
orignal
but how do you know rtt at that moment?
orignal
if it's first message came from me?
orignal
you send Ack to my SessionConfirmed
zzz
initial RTT is set during the handshake
orignal
that I understand
orignal
how?
orignal
it's RTT + x25519 time
zzz
by timing how long to get the handshake message back
orignal
between wich messages if you are Bob?
orignal
you send SessionCreated and wait SessionConfirmed?
zzz
that sounds right, but I'd have to check
orignal
the problem is x25519 round
zzz
InboundEstablishState2.java: _rtt = (int) ( _context.clock().now() - _lastSend );
orignal
on Alice side
zzz
sure, it's not perfect, but it's a good place to start
orignal
do you know how long x25519 is?
orignal
I believe few millseconds at least
zzz
no, but we have a queue of eph. keys precalculated, so that saves a little
zzz
still better than just a constant. if the peer is slow doing DH, it's probably slow for other stuff
orignal
ofc I mean x5519 shared key calculation
orignal
my point is
zzz
rtt is just an estimate anyway, not trying to be perfect
orignal
what if your RTT is much higher than on my side
orignal
say my RTT is based on RelayRequst->Ack
orignal
so what was your ack delay time?
orignal
10 ms?
zzz
yes
orignal
should not be an issue than
orignal
let me investigate deeper
zzz
ok, afk, back tomorrow