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Re: Fiber internet issue
To: CRTech <crtech@crtech.org>
Subject: Re: Fiber internet issue
From: Sherrod Munday <smunday@ieee.org>
Date: Wed, 29 Nov 2017 19:24:49 -0500
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In-reply-to: <20d89fd9-20b1-3417-135d-e045290858b5@spiritfm.org>
References: <CAOkhgWqA_yDePK5YVxL2_C+48S2UDCzt_+PxZ_qGGxu2jeik5g@mail.gmail.com> <20d89fd9-20b1-3417-135d-e045290858b5@spiritfm.org>
On Nov 29, 2017, at 16:15, Jim McDermott <jim@spiritfm.org> wrote:
> Anyone on this list familiar with ATT MIS Fiber. I have a really strange issue. Ever since last weekend, I cannot connect to my own spiritfm website, but it's only on computers connected to the fiber. It has been that way all day today. Monday and Tuesday, it would come and go. I can access our website through my phone or through my backup DSL. All other internet traffic seems normal. ATT doesn't have any answers and Godaddy says the website and server are just fine. How would an ISP be able to block one IP address?

I'm not sure that the ISP is blocking anything.  As others have suggested, check your internal network and/or router/firewall.  It also could be an intermittent issue on the server end -- something that doesn't show up consistently.  There could be a bad route on the far end (server)'s router that's taking your data requests and responding to them in the wrong direction/interface.  There are myriad possibilities.

Do a traceroute to find out where it's dropping packets.  (We're assuming that your firewall is configured to allow traceroute ICMP messages.)  See if you're dealing with a DNS issue where the IP address is unresolvable.

From my location (TN), both of your domain name servers resolve "www.spiritfm.org" to 192.124.249.158, and my DNS servers (using Charter) also report the same IP address.

I would note that the page does take a few seconds to start loading.  I'm not sure if that's your physical web server, a virtual misconfiguration, or a server that's simply overtaxed and unable to respond quickly, or just a one-time thing?

A long-term (about 40 minutes) traceroute with the 'mtr' program shows some stats that might indicate something going on with the final few hops right before getting to the server.   Look at the chart below with a fixed-width font (copy and paste into Notepad if necessary) to see the stats for the various hops on the way.

-----------------------------------------------------------------
                                    My traceroute  [v0.86]
local (0.0.0.0)                                          Wed Nov 29 19:16:30 2017
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                     Packets               Pings
 Host                                              Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 192.168.1.1                                    63.9%  2574    0.8   0.8   0.3  29.6   1.6
 2. ???
 3. dtr02clevtn-tge-0-5-0-2.clev.tn.charter.com     0.0%  2574    9.8   9.2   4.1  47.3   1.9
 4. dtr03mavltn-bue-200.mavl.tn.charter.com         0.0%  2574   11.9  11.4   7.6  52.6   1.7
 5. dtr03dltnga-tge-0-1-0-0.dltn.ga.charter.com     0.0%  2574   11.7  11.6   6.5  92.8   2.4
 6. dtr02clmatn-tge-0-6-0-3.clma.tn.charter.com     0.0%  2574   12.9  13.2   9.0 165.4   3.4
 7. crr01kgpttn-bue-201.kgpt.tn.charter.com         0.0%  2574   14.6  14.9  10.9  62.2   2.2
 8. 96-34-12-145.static.unas.mo.charter.com         0.0%  2573   19.6  19.8  14.8  49.5   1.6
 9. bbr01spbgsc-bue-4.spbg.sc.charter.com           0.0%  2573   22.7  23.7  16.9  70.0   3.1
10. cha-b1-link.telia.net                           0.0%  2573   21.2  21.5  16.3  71.2   3.2
11. atl-b22-link.telia.net                          0.0%  2573   25.5  27.7  21.4  83.8   4.1
12. ae5-168.cr1-atl1.ip4.gtt.net                    0.1%  2573   28.8  26.7  20.8 308.5   6.5
13. et-0-0-65.cr2-was1.ip4.gtt.net                  0.1%  2573   40.8  38.2  29.1 199.0  18.6
14. ???
15. cloudproxy10158.sucuri.net                      0.0%  2573   35.1  35.5  31.2 103.3   2.5
-----------------------------------------------------------------

I'd suggest running 'mtr' first, and then it would probably take some packet sniffing or poking into your firewall/router to dig much deeper.
--
Sherrod Munday
<smunday@ieee.org>

References: HEADS UP! Ron Hutchcraft odd ending
(Willie Barnett <wbradiolists@gmail.com>, 29 Nov 2017 15:58:59 -0000)
Fiber internet issue
(Jim McDermott <jim@spiritfm.org>, 29 Nov 2017 21:15:52 -0000)
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