I second this, most best effort Broadband cpe equipment will choke with
lots of concurrent connections
On Tue, Nov 2, 2021, 8:25 PM P C wrote:
> If this is connection count related only, It is most likely an issue with
> the CPE (router), NAT table, or similar.
>
> On Tue, Nov 2, 2021 at 8:21 AM Neel Chauhan wrote:
>
>> I tried that back in September, it didn't work. It doesn't happen on my
>> hop but the one after that. Even a second GPON connection shows the
>> issues if one is running the offending traffic.
>>
>> The issue occurs even if I'm using 50 Mbps out of my 940.
>>
>> It may be bufferbloat on CL's side but they keep denying the issue.
>>
>> I guess I'll have to break the bank and get Comcast Gigabit Pro.
>>
>> CenturyLink should just get bought out by another telco, like how
>> Cablevision got bought by Altice.
>>
>> -Neel
>>
>> On 2021-11-01 20:52, Ryan Hamel wrote:
>> > Neel,
>> >
>> > Sounds like buffer bloat.
>> >
>> > Run a speed test, whatever is your maximum for your download and upload
>> > take
>> > 10% away from it, and setup traffic shaping in OPNsense
>> > (https://docs.opnsense.org/manual/shaping.html) with those values. If
>> > the
>> > issue goes away, then you're exceeding the buffer of CenturyLink's
>> > device
>> > with the bursts of traffic.
>> >
>> > Ryan
>> >
>> > -Original Message-
>> > From: NANOG On Behalf Of
>> > Neel
>> > Chauhan
>> > Sent: Monday, November 1, 2021 6:44 PM
>> > To: nanog@nanog.org
>> > Subject: CenturyLink Fiber Latency Issues (Seattle, WA)
>> >
>> > Hi NANOG Mailing List,
>> >
>> > I don't know if any of you work at CenturyLink/Lumen, very less on
>> > their
>> > Fiber network in Seattle, WA. However, here's my story.
>> >
>> > If I attempt to run certain applications that use 1000, or 1 TCP
>> > connections, I get latency spikes. It is based on how many connections,
>> > but
>> > also how much bandwidth is used. This means certain things like Tor
>> > relays
>> > are off limits to me (which I wish to run).
>> >
>> > On an idle connection, the PingPlotter outputs look like this:
>> > https://centurylinklatencyissues.com/image-000.png
>> >
>> > If I attempt to run BitTorrent with 1000 connections in Deluge,
>> > PingPlotter
>> > looks like this:
>> > https://centurylinklatencyissues.com/image-002.png
>> >
>> > Getting support, or even executive contacts to admit the issue hasn't
>> > worked. They all love to blame my equipment or applications, when CL
>> > routers
>> > also show the issue when I run the same things whereas my same exact
>> > OPNsense box on Google Fiber Webpass running Tor at another address had
>> > no
>> > issues whatsoever, and I can ping other Tor relays on CenturyLink AS209
>> > just
>> > fine (from a VPS).
>> >
>> > The most competent person I dealt with was actually one tech. He told
>> > me
>> > there was "capacity issues" in our neighborhood, and that's the reason
>> > for
>> > the issues. However, nothing was done about it afterwards, I'm guessing
>> > since I turned off my Tor relay after the visit to avoid complaints
>> > from
>> > family members.
>> >
>> > On an AT&T forum, people have said GPON gives latency spikes/packet
>> > loss on
>> > congestion:
>> >
>> https://www.dslreports.com/forum/r33242889-How-rare-is-GPON-XGSPON-saturatio
>> > n
>> >
>> > The capacity managers in Seattle are literally dragging their feet:
>> > it's
>> > 100x worse than AT&T's 802.1X. I know AT&T and CenturyLink don't
>> > compete,
>> > but if I had to choose between AT&T Fiber and CenturyLink, I'll take
>> > AT&T in
>> > a heartbeat, no ifs, no buts, even if I have to use AT&T's crappy
>> > router
>> > instead of my OPNsense box.
>> >
>> > Going back, do any of you who work at CenturyLink/Lumen can get me to
>> > the
>> > right people, hopefully the capacity managers in Seattle?
>> >
>> > I could go with Comcast, but it's either (a) 35 Mbps uploads or (b)
>> > $329/mo
>> > for "Gigabit Pro" with a 2-year contract and a steep install fee. I am
>> > seriously considering Gigabit Pro even if it breaks the bank, but hope
>> > I
>> > won't have to go there.
>> >
>> > I don't need 2 Gbps and would rather pay $65 than $329. 300-500 Mbps
>> > uploads
>> > when I need it is the sweet spot for me (even without Tor) which CL
>> > GPON
>> > should easily handle without a sweat. I also don't exactly
>> > **trust** Comcast, they're a horrible company in many metrics, but in
>> > some
>> > ways Comcast is more competent than CenturyLink.
>> >
>> > Best,
>> >
>> > Neel Chauhan
>>
>
