@eyedeekay
+R4SAS
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+orignal
FreeRider
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orignal
I think it couldn't detect MTU and falled back to 1280
zzz
2a06:a004:, could be windows w/o the fix
orignal
maybe
orignal
see I set 1420 max
orignal
but it might be less from real interface
zzz
ok, here's today's problem
zzz
two simultaneous sessions with i2pd
zzz
I don't think it's caused by lost termination messages
zzz
I have an outbound IPv6 session to i2pd
orignal
then why do you allow them?
zzz
I get an inbound session request on IPv4 from the same router
zzz
and first thing he sends is a peer test
orignal
cdoF ?
zzz
still researching whats going wrong on my side, but the fact that it's a different IP is part of my problem
zzz
YXEA gpUB jLgO iNmq
orignal
are you talking about your firewalled router?
zzz
yes
zzz
and no.
zzz
happened on two routers, one firewalled, one not
orignal
so when that i2pd connect to you it had to relay request firt
zzz
no. I'm firewalled on v6, that's the outbound connection. Then I get an inbound on v4
zzz
for a peer test
orignal
is it possible that you have created that outging session during relay request?
orignal
thanks
orignal
will take a look
zzz
will research further on my side, don't have all the answers yet
orignal
I should check if there a session with router already
orignal
not by endpoint but by ident
zzz
yeah that would help if you're not doing that now
zzz
seems to be for peer test msg 1
orignal
I will check
orignal
also cdoF is special case
orignal
because it connects to you explicitly
zzz
haven't seen it from him
orignal
when you see two session does one of them gets terminated shortly?
zzz
it should but I think I have some bugs
orignal
I should send termination in this case
zzz
looking to see what I do for SSU 1
zzz
I don't send destroy in SSU 1 or 2 now
orignal
I do. Thta's why it's strange
zzz
agreed that we should
zzz
let's add new termination code 22 for it
orignal
I send code 1 now
orignal
in this case
zzz
1 doesn't sound right. can we make it 22?
dr|z3d
interesting error re packet pusher, not sure if it's an error or should be classified as a warning..
dr|z3d
[…DPPktPusher] …rt.udp.UDPSender: Dropping large UDP packet 1473 bytes:
dr|z3d
• Address: 62.210.85.80:24768
dr|z3d
• Size: 1473 bytes; Priority: 200; Message Type: 19; Fragment Count: 2
dr|z3d
java.lang.Exception
dr|z3d
at net.i2p.router.transport.udp.UDPSender.add(UDPSender.java:212)
dr|z3d
at net.i2p.router.transport.udp.PacketPusher.send(PacketPusher.java:78)
dr|z3d
at net.i2p.router.transport.udp.PacketPusher.run(PacketPusher.java:44)
dr|z3d
at java.base/java.lang.Thread.run(Thread.java:833)
dr|z3d
at net.i2p.util.I2PThread.run(I2PThread.java:103)
zzz
hmm, off by one
dr|z3d
1472 max packet size?
zzz
+28 ipv4/udp overhead = 1500, yup
dr|z3d
ok, so we can blame the sender then I guess.
zzz
62.210.85.80:24768 is SSU2
dr|z3d
French, I have 4 routers on that address.
zzz
to be clear, the sender is you
dr|z3d
oh, right, I guess we're pushing packets not receiving them doh
orignal
yes, let's do it
orignal
I used first most suitable
zzz
ok great orignal I'm going to add a section about multiple sessions to the spec
zzz
also, forgot to tell you, but I am sending termination reason 1 in response to termination now
orignal
me too
zzz
have not yet implemented "closing state", not sure when I'll get to it
zzz
dr|z3d, thought I fixed all my oversized pkt bugs months ago, I'll try to track it down
dr|z3d
zzz: router's fairly current, it's got everything up to your >=256 bitfield shift fix.
zzz
happen to have PacketBuilder2 logging on WARN or better? if so you should have a WARN message starting with "Size is" just before the error, that would help
dr|z3d
unfortunately not, but let me enable that now. router wasn't logging much at all, default ERROR level.
dr|z3d
ok, 4 ssu2 classes setup as warn level.
zzz
rats, but ok, trap is set for next time
dr|z3d
yeah, very rare that one, only seen it once on one router as yet.
zzz
note that you'll get "Size is" msgs without the subsequent error too, those are fine
dr|z3d
ok
zzz
orignal, I see a couple of i2pd routers with IPv4 MTU now, so it looks like you have that fixed
orignal
no
zzz
no?
orignal
you only see it if local address is specified explicily
zzz
ok, got it
orignal
I still don't have a code to find it
orignal
due the NAT
zzz
just reporting what I see, didn't understand the details
orignal
I know, just explaining what's this
zzz
:)
orignal
another "bind" thing
orignal
but strange that people bind ipv4
orignal
it's usually v6
dr|z3d
I'm getting a lot of ".PeerState2: ACKed but not found in outbound messages" warnings.. I guess that's nothing unusual, zzz?
zzz
yeah thats fine
zzz
but should be rare?
dr|z3d
5 in the last 1/2 hour
dr|z3d
and ongoing.. seems to be fairly regular.
zzz
I have 120 in 17 days
dr|z3d
ok, I'll keep an eye on it.
orignal
12:25:15@683/debug - SSU2: Block type 4 of size 1138
orignal
12:25:15@683/debug - SSU2: First fragment
orignal
12:25:15@683/debug - SSU2: Block type 5 of size 989
orignal
12:25:15@683/debug - SSU2: Follow-on fragment
orignal
nice split
orignal
found the issue with duplicated session
R4SAS
I'll update my routers part by part now
R4SAS
with sessions fix
orignal
and with windows
zzz
great, thanks. I'm testing my fixes on my side
R4SAS
I see bunch of transit now on ssu2-only router
orignal
because I have made resend interval 10 times less then before ))
zzz
your retransmission timer?
orignal
yes, 300 ms
orignal
but now I will use calculated RTO
orignal
300 ms for first reatrans ofc
orignal
then it's gorwing
zzz
I'll give you ours:
zzz
min(1000, max(60000, RTT + 4*RTTdev))
orignal
why 1000?
zzz
w/ exponential backoff
orignal
yes the same
orignal
but why 1000?
zzz
will research and get back to you, gotta run
orignal
in my opinion if your RTT is more than 300 you shouldn't mantain this ession
orignal
session
orignal
remeber RTT between Toronro and Chicago is 6 ms
orignal
hence 1000 is extremely high
zzz
yeah sounds high to me also. But remember it's measured RTT, which includes both real RTT, queueing time, CPU time, delayed ack, ...
zzz
but I'll figure out how we got here and what QUIC recommends
orignal
you know I limit client tunnels by 250 ms per hop
orignal
if exceed I exclude such tunnels
zzz
ok we went from 250 to 1000 min. in Feb 2019, ref: trac ticket #2443. I'm sure zlatinb was involved
zzz
QUIC minimum is 1 ms
zzz
our streaming minimum is 100 ms
zzz
i doubt I can find the trac ticket but the title is "Make SSU compliant with RFC 6298"
zzz
(2.4) Whenever RTO is computed, if it is less than 1 second, then the
zzz
RTO SHOULD be rounded up to 1 second.
zlatinb
yes
zzz
Traditionally, TCP implementations use coarse grain clocks to
zzz
measure the RTT and trigger the RTO, which imposes a large
zzz
minimum value on the RTO. Research suggests that a large
zzz
minimum RTO is needed to keep TCP conservative and avoid
zzz
spurious retransmissions [AP99]. Therefore, this specification
zzz
requires a large minimum RTO as a conservative approach, while
zzz
at the same time acknowledging that at some future point,
zzz
research may show that a smaller minimum RTO is acceptable or
zzz
superior.
zzz
and here's the AP99 reference:
orignal
I will try
zzz
zlatinb, do you recall why you considered RFC 6298 as the gold standard as opposed to some other recommendation?
zlatinb
it contained the most detailed description of the calculations to my knowledge
zlatinb
not just the min RTO but the whole computation
zzz
the document says it's conservative, and clearly it is, but that doesn't mean it's wrong. interesting though that our end-to-end streaming protcol has a 10x smaller minimum
zzz
orignal, here's what I see for measured SSU RTTs on two boxes:
zzz
box 1 (hosted): min 3ms, max 4sec, median ~110ms
zzz
box 2 (home): min 43ms, max 689ms, median ~175ms
zzz
orignal, the analysis, of course, must be based on efficiency, i.e. % retransmissions. What's your retransmission rate before and after the change?
zzz
for me: box 1: 1.6%; box 2: 6.5%
zzz
a lot higher than I would have guessed
zzz
not sure if an average across all conns is the best metric though
dr|z3d
looks like another part tunnel spike is in progress
zzz
yeah I've been keeping an eye on things. we are going into the weekend, with higher traffic in general, but that's also when the last big event was
dr|z3d
yeah, this is definitely an abnormal spike, the second obvious one today, but less pronounced than previously.
R4SAS
testing now 0-0/1-1 tunnel (server/client) with ssu2
R4SAS
1.2 MB/s in peak