<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small;color:#000000">Thank you for explaining, well noted</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small;color:#000000">Ethan, are you still experiencing issues ?</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 16, 2021 at 6:58 PM Jeremy Chadwick <<a href="mailto:jdc@koitsu.org">jdc@koitsu.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Several backbone providers define DNS PTR records (reverse) of their<br>
routers interface IPs, but not A records (forward).<br>
Verizon/MCI/Alter/UUnet is notorious for this; it's nothing new.<br>
<br>
traceroute doesn't "involve DNS" as part of how the actual protocol<br>
(methodology) works -- the traceroute client only sees IPs in ICMP<br>
time-exceeded responses to initial UDP or TCP probes. Thus, the<br>
traceroute/tracert client issues PTR record lookups (on *IX usually by<br>
gethostbyaddr()) and shows whatever the results are. Forward lookups<br>
aren't usually done (though some "enhanced" traceroute clients like mtr<br>
and WinMTR do). Otherwise, tell your traceroute client to only show IP<br>
addresses, and not do reverse lookups.<br>
<br>
$ dig a <a href="http://8-1-2.b2.nyc4.alter.net" rel="noreferrer" target="_blank">8-1-2.b2.nyc4.alter.net</a><br>
...<br>
;; Got answer:<br>
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 29284<br>
<br>
$ dig ptr 201.110.179.152.in-addr.arpa<br>
...<br>
;; ANSWER SECTION:<br>
201.110.179.152.in-addr.arpa. 21427 IN PTR <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a>.<br>
<br>
Now you're going to ask: "how did you find IP 152.179.110.201 ?"<br>
The answer is: Googling "<a href="http://8-1-2.b2.nyc4.alter.net" rel="noreferrer" target="_blank">8-1-2.b2.nyc4.alter.net</a>" and hoping someone<br>
on the Internet provided traceroute results that contained IPs in<br>
addition to PTR -- in this case, 4 search results were good enough.<br>
<br>
There are other ways of determining this as well, but I'm intentionally<br>
omitting that procedure, as it's brute-force and not always reliable.<br>
<br>
-- <br>
| Jeremy Chadwick <a href="mailto:jdc@koitsu.org" target="_blank">jdc@koitsu.org</a> |<br>
| UNIX Systems Administrator PGP 0x2A389531 |<br>
| Making life hard for others since 1977. |<br>
<br>
On Tue, Feb 16, 2021 at 12:45:44PM -0500, Izzy Goldstein - TeleGo via Outages wrote:<br>
> C:\Users\Izzy>tracert <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a><br>
> Unable to resolve target system name <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a>.<br>
> <br>
> C:\Users\Izzy><br>
> <br>
> On Mon, Feb 15, 2021 at 12:41 PM Ethan Hayon <<a href="mailto:ethan@naturalwireless.com" target="_blank">ethan@naturalwireless.com</a>><br>
> wrote:<br>
> <br>
> > Traffic is getting dropped through node: <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a><br>
> ><br>
> > 1. <redacted><br>
> > 2. <redacted><br>
> > 3. <a href="http://te0-0-0-14.nr01.b026191-1.jfk01.atlas.cogentco.com" rel="noreferrer" target="_blank">te0-0-0-14.nr01.b026191-1.jfk01.atlas.cogentco.com</a><br>
> ><br>
> > 4. <a href="http://te0-3-0-11.rcr24.jfk01.atlas.cogentco.com" rel="noreferrer" target="_blank">te0-3-0-11.rcr24.jfk01.atlas.cogentco.com</a><br>
> ><br>
> > 5. <a href="http://be2897.ccr42.jfk02.atlas.cogentco.com" rel="noreferrer" target="_blank">be2897.ccr42.jfk02.atlas.cogentco.com</a><br>
> ><br>
> > 6. <a href="http://be3496.ccr31.jfk10.atlas.cogentco.com" rel="noreferrer" target="_blank">be3496.ccr31.jfk10.atlas.cogentco.com</a><br>
> ><br>
> > 7. <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a><br>
> ><br>
> > 8. ???<br>
> ><br>
> > Occasionally a packet or two will get through <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a><br>
> ><br>
> > What's strange is the issue is only occurring with specific IPs on my<br>
> > office FiOS circuit (even within the same /24).<br>
> ><br>
> > These are the same symptoms we experienced in May 2019 [<br>
> > <a href="https://puck.nether.net/pipermail/outages/2019-May/012266.html" rel="noreferrer" target="_blank">https://puck.nether.net/pipermail/outages/2019-May/012266.html</a>]<br>
> ><br>
> > I was under the impression that Verizon has made a change on their end to<br>
> > resolve the issues.<br>
> ><br>
> > Thanks,<br>
> ><br>
> > --<br>
> > Ethan Hayon<br>
> > Natural Wireless<br>
> > [T] 201-438-2865 x416<br>
> ><br>
> ><br>
> > On Mon, Feb 15, 2021 at 12:36 PM Izzy Goldstein - TeleGo <<br>
> > <a href="mailto:igoldstein@telego.net" target="_blank">igoldstein@telego.net</a>> wrote:<br>
> ><br>
> >> What issue are you seeing ?<br>
> >><br>
> >> On Sun, Feb 14, 2021 at 11:40 AM Ethan Hayon via Outages <<br>
> >> <a href="mailto:outages@outages.org" target="_blank">outages@outages.org</a>> wrote:<br>
> >><br>
> >>> This issue just started back up for us. Anyone else seeing this again?<br>
> >>><br>
> >>> Seeing issues at node: <a href="http://8-1-2.BR2.NYC4.ALTER.NET" rel="noreferrer" target="_blank">8-1-2.BR2.NYC4.ALTER.NET</a><br>
> >>><br>
> >>> Thanks,<br>
> >>><br>
> >>> --<br>
> >>> Ethan Hayon<br>
> >>> Natural Wireless<br>
> >>> [T] 201-438-2865 x416<br>
> >>><br>
> >>><br>
> >>> On Tue, May 14, 2019 at 11:04 AM Dovid Bender <<a href="mailto:dovid@telecurve.com" target="_blank">dovid@telecurve.com</a>><br>
> >>> wrote:<br>
> >>><br>
> >>>> I got an email from someone at Verizon late last night that I should<br>
> >>>> re-check and see if it is working. If anyone is still having issues let me<br>
> >>>> know and I will reach out to them.<br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>> On Tue, May 14, 2019 at 10:38 AM Ethan Hayon <<a href="mailto:ethan@naturalwireless.com" target="_blank">ethan@naturalwireless.com</a>><br>
> >>>> wrote:<br>
> >>>><br>
> >>>>> It's been stable for us since around 11PM EST last night (5/13)<br>
> >>>>><br>
> >>>>> Anyone else still seeing issues?<br>
> >>>>><br>
> >>>>> --<br>
> >>>>> Ethan Hayon<br>
> >>>>> Natural Wireless<br>
> >>>>> [T] 201-438-2865 x416<br>
> >>>>><br>
> >>>>><br>
> >>>>> On Mon, May 13, 2019 at 11:55 PM Valdis Klētnieks <<br>
> >>>>> <a href="mailto:valdis.kletnieks@vt.edu" target="_blank">valdis.kletnieks@vt.edu</a>> wrote:<br>
> >>>>><br>
> >>>>>> On Mon, 13 May 2019 14:53:34 -0400, Ethan Hayon via Outages said:<br>
> >>>>>><br>
> >>>>>> > Reachability keeps going up and down through this node. Is it 768K<br>
> >>>>>> day<br>
> >>>>>> > yet???<br>
> >>>>>><br>
> >>>>>> I remember 128K day and 256K day, and warnings of impending doom<br>
> >>>>>> on both occasions. And both times, there were those who had to<br>
> >>>>>> withdraw<br>
> >>>>>> from the DFZ and issue emergency purchase orders because they didn't<br>
> >>>>>> plan ahead for their CAPEX needs...<br>
> >>>>>><br>
> >>>>> _______________________________________________<br>
> >>> Outages mailing list<br>
> >>> <a href="mailto:Outages@outages.org" target="_blank">Outages@outages.org</a><br>
> >>> <a href="https://puck.nether.net/mailman/listinfo/outages" rel="noreferrer" target="_blank">https://puck.nether.net/mailman/listinfo/outages</a><br>
> >>><br>
> >><br>
> >><br>
> >> --<br>
> >><br>
> >> Izzy Goldstein<br>
> >><br>
> >> Chief Technology Officer<br>
> >><br>
> >> Main: (212) 477-1000 x 2085 <(212)%20477-1000><br>
> >><br>
> >> Direct: (929) 477-2085<br>
> >><br>
> >> Website: <a href="http://www.telego.com" rel="noreferrer" target="_blank">www.telego.com</a> <<a href="http://www.telego.net/" rel="noreferrer" target="_blank">http://www.telego.net/</a>><br>
> >><br>
> >><br>
> >> <<a href="http://www.telego.com/" rel="noreferrer" target="_blank">http://www.telego.com/</a>><br>
> >><br>
> >><br>
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> >><br>
> ><br>
> <br>
> -- <br>
> <br>
> Izzy Goldstein<br>
> <br>
> Chief Technology Officer<br>
> <br>
> Main: (212) 477-1000 x 2085 <(212)%20477-1000><br>
> <br>
> Direct: (929) 477-2085<br>
> <br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="font-size:12.8px"><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;font-weight:700;vertical-align:baseline;white-space:pre-wrap">Izzy Goldstein </span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;font-style:italic;vertical-align:baseline;white-space:pre-wrap">Chief Technology Officer </span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Main: </span><span style="font-size:13.3333px;font-family:arial;color:rgb(17,85,204);background-color:transparent;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap"><a href="tel:(212)%20477-1000" value="+12124771000" style="color:rgb(17,85,204)" target="_blank">(212) 477-1000 x 2085</a></span><span style="font-size:13.3333px;font-family:arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Direct: </span><span style="font-size:13.3333px;font-family:arial;color:rgb(17,85,204);background-color:transparent;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap"><a href="tel:(929)%20477-2085" value="+19294772085" style="color:rgb(17,85,204)" target="_blank">(929) 477-2085</a></span></p><p dir="ltr" style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Website:</span><span style="font-size:13.3333px;font-family:arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span><a href="http://www.telego.net/" style="color:rgb(17,85,204);text-decoration:none" target="_blank"><span style="font-size:13.3333px;font-family:arial;background-color:transparent;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap">www.telego.com</span></a><span style="font-size:13.3333px;font-family:arial;color:rgb(67,67,67);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12.8px"></span><span style="font-size:12.8px"><br></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><a href="http://www.telego.com/" style="color:rgb(17,85,204);text-decoration:none" target="_blank"><span style="font-size:13.3333px;font-family:arial;background-color:transparent;font-weight:700;text-decoration:underline;vertical-align:baseline;white-space:pre-wrap"><img src="https://lh4.googleusercontent.com/Ze7NkT2QtotXfVWbpWXrpSMRIcAdqb0Ci0_RZsAjQzmRrd-_v02-O86QlqwZnGUE8SlBECXBvJUPXSH7ZRyDvDVeaXQFSS5SiA4gan112DN-0s2D3prRdt2UeUprZQEo1YmUFfZ7" width="182" height="54" style="border: none;"></span></a></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12.8px"><br></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10.6667px;font-family:arial;color:rgb(153,153,153);font-style:italic;vertical-align:baseline;white-space:pre-wrap">Confidentiality Notice: This e-mail may contain confidential and/or privileged information. 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