TBB Graph - any ideas about this pattern?
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TBB Graph - any ideas about this pattern?
15-12-2015 7:59 PM
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The other odd thing is that these latency spikes don't correspond with my logging of RTT pinging outwards from the house. Note I don't have the whole period because my desktop PC was offline early evening, but the graph covers most of the same time. On the other hand my probe shows drops where the TBB graph doesn't, and these drops are very few and don't correspond with the TBB episodes either.
Any thoughts?
Re: TBB Graph - any ideas about this pattern?
15-12-2015 8:05 PM
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Do you by chance have a Sam Knows internet monitor?
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Re: TBB Graph - any ideas about this pattern?
15-12-2015 9:27 PM
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Re: TBB Graph - any ideas about this pattern?
16-12-2015 12:05 AM
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Re: TBB Graph - any ideas about this pattern?
16-12-2015 9:20 AM
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Thinking about why latency would show on TBB pinging in, but not PRTG pinging out - I saw somewhere that Plusnet prioritise ping on download traffic - could it be that the prioritise echo-reply specifically, rather than both directions?
Re: TBB Graph - any ideas about this pattern?
16-12-2015 10:04 AM
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Will RouterStats work with your router? Would be interesting to see what's happening with SNRM and error counts. This is not traffic shaping.
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Re: TBB Graph - any ideas about this pattern?
16-12-2015 12:40 PM
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Re: TBB Graph - any ideas about this pattern?
16-12-2015 4:52 PM
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I have noticed that the first packet in a series of incoming ping echo request packets tends to be prioritised as 0x80 (gold), and the rest get 0xA0 (titanium), but I don't know if the one ping packet per second that a TBB monitor sends are far enough apart so that they all end up gold. For the ping monitor running in the other direction, as you send out the ping echo requests, the traffic management then should be expecting the ping responses, so they all get classified titanium.
Re: TBB Graph - any ideas about this pattern?
16-12-2015 6:39 PM
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Quote from: ejs ... I still don't really think that they can. CRC errors would be visible as packet loss on the ping monitor graphs, not increased latency.
I agree. I think the only contrary view comes from people at Plusnet who I suspect aren't really up to understanding things like that.
However that wasn't really the reason for my post. I was really wondering if that "signature" of episodes regularly appearing day and night was recognised. It's not every day, but appeared on the 1st, 2nd and 4th of December, then again yesterday. But not today or Monday. My guess is network traffic, our link is quite slow and it doesn't take much particularly in the upload direction to push the RTT up to 100 to 150ms. I just can't think of any recurring job that would do this.
What marking are you referring to? I've just done a quick capture on the LAN and as far as I can see all echo-replies come back with dscp 0x28. I must say I would be surprised if Plusnet are relating echo requests with replies on a stateful basis.
Re: TBB Graph - any ideas about this pattern?
16-12-2015 6:50 PM
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Quote Differentiated Services Field: 0xa0 (DSCP: CS5, ECN: Not-ECT)
Or the PREC in a firewall (iptables) log if I use a website to ping my IP - the first one gets 0x80, the rest get 0xA0
Quote IN=ppp0 OUT= MAC= SRC=67.222.132.211 DST=87.112.my.ip LEN=28 TOS=0x00 PREC=0x80 TTL=238 ID=9553 PROTO=ICMP TYPE=8 CODE=0 ID=124 SEQ=8875
IN=ppp0 OUT= MAC= SRC=67.222.132.211 DST=87.112.my.ip LEN=28 TOS=0x00 PREC=0xA0 TTL=238 ID=9554 PROTO=ICMP TYPE=8 CODE=0 ID=124 SEQ=9314
IN=ppp0 OUT= MAC= SRC=67.222.132.211 DST=87.112.my.ip LEN=28 TOS=0x00 PREC=0xA0 TTL=238 ID=9555 PROTO=ICMP TYPE=8 CODE=0 ID=124 SEQ=9328
IN=ppp0 OUT= MAC= SRC=67.222.132.211 DST=87.112.my.ip LEN=28 TOS=0x00 PREC=0xA0 TTL=238 ID=9556 PROTO=ICMP TYPE=8 CODE=0 ID=124 SEQ=9338
Re: TBB Graph - any ideas about this pattern?
16-12-2015 7:28 PM
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Also the DSCP values didn't look familiar which was why I asked and looked. I think your device may be counting two more bits on the right, or is that a PPP representation? I'm used to the 0-63 (decimal) range, but to be honest for our kit we can normally enter names (EF, CS5 etc), so I'd probably have had to look up the number in any case.
Re: TBB Graph - any ideas about this pattern?
16-12-2015 8:15 PM
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Differentiated Services Field: 0xa0 (DSCP: CS5, ECN: Not-ECT)
1010 00.. = Differentiated Services Codepoint: Class Selector 5 (40)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
The whole hex values are used in this guide for checking the traffic prioritisation. I'll edit my previous post to use a more accurate term.
Re: TBB Graph - any ideas about this pattern?
16-12-2015 10:55 PM
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Bob Pullen
Plusnet Product Team
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Re: TBB Graph - any ideas about this pattern?
17-12-2015 7:00 AM
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Re: TBB Graph - any ideas about this pattern?
17-12-2015 7:23 AM
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Quote from: ejs I'm just going on what wireshark usually gives,
Cheers, I'd never noticed that Wireshark displays these as 8 bit, maybe because the form I'm familiar with appears as well ...
[tt]Differentiated Services Field: 0xa0 (DSCP 0x28: Class Selector 5; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))[/tt]
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