[Outages-discussion] [outages] Spectrum/Charter IPv6 connectivity to CloudFlare down in Texas
Jeremy Chadwick
jdc at koitsu.org
Thu Apr 20 01:22:41 EDT 2023
(Moving to -discussion because there's nothing concrete in what I'm
about to say, i.e. nothing worth waking people up for.)
1. Your mtrs have lost their monospace/whitespace formatting for
whatever reason, making them difficult to read.
2. Your IPv6 mtr looks like it indicates POSSIBLE packet loss starting
at hop #4 and seems to trickle down through hops #5/6/7. I can't be
100% certain the loss is real (it could be ICMP deprio on Charter's
routers, but only for IPv6?!) because I have not seen what a working v6
mtr from you which uses the same routers/path. If it IS real loss, then
the problem is much more likely within Spectrum/Charter's network, but I
can't say that with absolute certainty, leading me to:
2. You have no return-path mtr for either v4 or v6, so you only are able
to see 50% of the entire picture. Asymmetric routing is commonplace
these days, which is why you need it from both directions.
If you really and absolutely think this is a CloudFlare problem (I am
not sold on that given the above two points), then we continue with:
3. Based on 141.101.74.104 in your v4 mtr, it looks like
Spectrum/Charter has a peering agreement with CloudFlare.
4. CloudFlare does not offer a public looking glass, but they do offer
an HTTP API-based traceroute, though it is sub-par in quality and kind
of bizarre, not to mention I don't know if it supports v6:
https://blog.clucas.fr/2021/11/18/traceroute-from-cloudflare-without-looking-glass/
Given items #3/4, have you tried reaching out to CloudFlare for a
return-path mtr back to whatever your v6 source IP is?
Their contact information is public: https://www.peeringdb.com/net/4224
--
| Jeremy Chadwick jdc_at_koitsu.org |
| UNIX Systems Administrator PGP 0x2A389531 |
| Making life hard for others since 1977. |
On Wed, Apr 19, 2023 at 11:37:10PM -0400, Daniel Marks via Outages wrote:
> Have been dealing with this for 2 days, nobody at Spectrum can figure this out.
>
> Daniel Marks
> May Mobility, Inc
>
> >
> > On Apr 19, 2023, at 19:26, Carl Perry via Outages <outages at outages.org> wrote:
> >
> > Things have been rather slow the last couple of days, just figured out why; No IPv6 connectivity to any CloudFlare services.
> >
> > > mtr -6 --report-wide cloudflare.com
> > Start: 2023-04-19T23:20:42+0000
> > HOST: defiant Loss% Snt Last Avg Best Wrst StDev
> > 1.|-- 2603-8081-2340-2868-0215-17ff-fe94-6457.res6.spectrum.com 0.0% 10 3.6 19.1 1.5 93.2 36.1
> > 2.|-- 2603-90c5-0003-0180-0000-0000-0000-0001.inf6.spectrum.com 0.0% 10 14.5 36.6 11.3 171.2 50.0
> > 3.|-- lag-63.hcr02rdrktxaz.netops.charter.com 0.0% 10 18.8 37.3 12.0 143.9 45.3
> > 4.|-- lag-19.ausxtxir02r.netops.charter.com 60.0% 10 65.8 30.2 11.7 65.8 24.9
> > 5.|-- lag-22.rcr01hstqtx02.netops.charter.com 80.0% 10 26.5 25.5 24.5 26.5 1.4
> > 6.|-- lag-16.hstqtx0209w-bcr00.netops.charter.com 90.0% 10 25.7 25.7 25.7 25.7 0.0
> > 7.|-- lag-12.dllstx976iw-bcr00.netops.charter.com 40.0% 10 25.4 26.3 18.2 44.4 9.5
> > 8.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
> >
> > IPv4 works however:
> >
> > > mtr -4 --report-wide cloudflare.com
> > Start: 2023-04-19T23:20:21+0000
> > HOST: defiant Loss% Snt Last Avg Best Wrst StDev
> > 1.|-- _gateway 0.0% 10 2.1 1.8 1.4 2.1 0.2
> > 2.|-- cpe-70-114-160-1.austin.res.rr.com 0.0% 10 51.9 34.4 14.3 149.7 42.1
> > 3.|-- lag-63.hcr01rdrktxaz.netops.charter.com 0.0% 10 13.1 38.5 13.1 159.1 44.6
> > 4.|-- lag-19.ausutxla01r.netops.charter.com 0.0% 10 18.1 21.0 14.3 34.8 6.0
> > 5.|-- lag-22.rcr01dllatx37.netops.charter.com 0.0% 10 23.4 23.3 18.3 33.3 4.3
> > 6.|-- lag-14.dllstx976iw-bcr00.netops.charter.com 0.0% 10 19.8 27.0 16.1 51.2 11.9
> > 7.|-- lag-0.pr3.dfw10.netops.charter.com 0.0% 10 39.3 28.5 14.1 62.3 16.7
> > 8.|-- 141.101.74.104 40.0% 10 53.2 44.3 19.4 120.2 39.2
> > 9.|-- 172.71.168.2 0.0% 10 28.3 28.8 10.8 79.4 19.5
> > 10.|-- 104.16.133.229 0.0% 10 122.0 42.8 16.9 122.0 34.4
> >
> > It's kind of wild how many things don't fall back to IPv4 quickly (lots of Android TV apps) or at all (.NET). I tried reaching out to Spectrum support, but being a lowly consumer I was only told that "The modem doesn't have any filters" and that "the problem may be on the CloudFlare side", which was sadly what I predicted. So, I figured I would raise the issue here in the hopes that actual network people would see it.
> >
> > -Carl
> >
> >
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