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Identifying submarine links via traceroute
by PAUL R BARFORD 29 Sep '21

29 Sep '21

Hello, I am a researcher at the University of Wisconsin. My colleagues at Northwestern University and I are studying submarine cable infrastructure. Our interest is in identifying submarine links in traceroute measurements. Specifically, for a given end-to-end traceroute measurement, we would like to be able to identify when two hops are separated by a submarine cable. Our initial focus has been on inter-hop latency, which can expose long links. The challenge is that terrestrial long-haul links may have the same or longer link latencies as short submarine links. So, we're interested in whether there may be other features (e.g., persistent congestion, naming conventions in router interfaces, peering details, etc.) or techniques that would indicate submarine links. Any thoughts or insights you might have would be greatly appreciated - off-list responses are welcome. Thank you. Regards, PB Paul Barford University of Wisconsin - Madison

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Admin for .tk (not a spam/abuse complaint!)
by Tim Harman 29 Sep '21

29 Sep '21

Hi, If anyone has contact details for the operators of the .tk TLD, could you contact me off-list please? We are unable to contact the authoritive NS for this TLD - it seems our range is on a blacklist or they have some odd route back to us that isn't working. Thus our customers can't resolve any .tk names. I've tried mailing a few @dot.tk (from a host that has no trouble resolving the domain!) but have heard nothing back. Specifically after a contact for whoever maintains ;; ADDITIONAL SECTION: a.ns.tk. 172800 IN A 194.0.38.1 b.ns.tk. 172800 IN A 194.0.39.1 c.ns.tk. 172800 IN A 194.0.40.1 d.ns.tk. 172800 IN A 194.0.41.1 {11:58}~ ➭ dig @194.0.41.1 test.tk ; <<>> DiG 9.11.5-P4-5.1+deb10u5-Debian <<>> @194.0.41.1 test.tk ; (1 server found) ;; global options: +cmd ;; connection timed out; no servers could be reached Many Thanks, Tim

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100GbE beyond 40km
by Randy Carpenter 28 Sep '21

28 Sep '21

How is everyone accomplishing 100GbE at farther than 40km distances? Juniper is saying it can't be done with anything they offer, except for a single CFP-based line card that is EOL. There are QSFP "ZR" modules from third parties, but I am hesitant to try those without there being an equivalent official part. The application is an ISP upgrading from Nx10G, where one of their fiber paths is ~35km and the other is ~60km. thanks, -Randy

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Robocall Mitigation Database Call Blocking Deadline Is Today
by Sean Donelan 28 Sep '21

28 Sep '21

According to the FCC, 4,798 companies had filed in the Robocall Mitigation Database with many hundreds of carriers, including all of the largest phone carriers, certifying to implementation of STIR/SHAKEN standards on their IP networks. Beginning today, if a voice service provider’s certification and other required information does not appear in the FCC’s Robocall Mitigation Database, intermediate providers and voice service providers will be prohibited from directly accepting that provider’s traffic. Note the word "directly." Guess what's going to happen? https://www.fcc.gov/document/fcc-robocall-mitigation-database-call-blocking…

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What happens when you don't validate/scrub data on input from whois
by Eric Kuhnke 28 Sep '21

28 Sep '21

https://research.securitum.com/fail2ban-remote-code-execution/ What happens if you put the following in your whois entry: drop table prefixes; Or anything similar... https://xkcd.com/327/

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VoIP Provider DDoSes
by Mike Hammett 28 Sep '21

28 Sep '21

As many may know, a particular VoIP supplier is suffering a DDoS. https://twitter.com/voipms Are your garden variety DDoS mitigation platforms or services equipped to handle DDoSes of VoIP services? What nuances does one have to be cognizant of? A WAF doesn't mean much to SIP, IAX2, RTP, etc. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest-IX http://www.midwest-ix.com

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Rack rails on network equipment
by Andrey Khomyakov 27 Sep '21

27 Sep '21

Hi folks, Happy Friday! Would you, please, share your thoughts on the following matter? Back some 5 years ago we pulled the trigger and started phasing out Cisco and Juniper switching products out of our data centers (reasons for that are not quite relevant to the topic). We selected Dell switches in part due to Dell using "quick rails'' (sometimes known as speed rails or toolless rails). This is where both the switch side rail and the rack side rail just snap in, thus not requiring a screwdriver and hands of the size no bigger than a hamster paw to hold those stupid proprietary screws (lookin at your, cisco) to attach those rails. We went from taking 16hrs to build a row of compute (from just network equipment racking pov) to maybe 1hr... (we estimated that on average it took us 30 min to rack a switch from cut open the box with Juniper switches to 5 min with Dell switches) Interesting tidbit is that we actually used to manufacture custom rails for our Juniper EX4500 switches so the switch can be actually inserted from the back of the rack (you know, where most of your server ports are...) and not be blocked by the zero-U PDUs and all the cabling in the rack. Stock rails didn't work at all for us unless we used wider racks, which then, in turn, reduced floor capacity. As far as I know, Dell is the only switch vendor doing toolless rails so it's a bit of a hardware lock-in from that point of view. *So ultimately my question to you all is how much do you care about the speed of racking and unracking equipment and do you tell your suppliers that you care? How much does the time it takes to install or replace a switch impact you?* I was having a conversation with a vendor and was pushing hard on the fact that their switches will end up being actually costlier for me long term just because my switch replacement time quadruples at least, thus requiring me to staff more remote hands. Am I overthinking this and artificially limiting myself by excluding vendors who don't ship with toolless rails (which is all of them now except Dell)? Thanks for your time in advance! --Andrey

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Vaccine Requirements for NANOG 83
by Nanog News 27 Sep '21

27 Sep '21

Vaccination Requirements for NANOG 83 A letter to our community from our executive director The global COVID-19 pandemic has brought challenges, and disruptions that most of us thought were unimaginable. The release and availability of the vaccine across our region brings us closer to some degree of normalcy. In an effort to create the safest environment for our community, we are requiring that all NANOG attendees provide proof of vaccination before attending NANOG 83 in Minneapolis. *READ NOW* <https://www.nanog.org/stories/vaccination-requirements-for-nanog-83/>

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Anyone else expereincing phone line issues from west to east ?
by babydr DBA James W. Laferriere 27 Sep '21

27 Sep '21

Hello All , Anyone else expereincing phone line issues from west to east ? Just tried calling back east and not even a all lines are busy signal . Tia , JimL -- +---------------------------------------------------------------------+ | James W. Laferriere | System Techniques | Give me VMS | | Network & System Engineer | 3237 Holden Road | Give me Linux | | jiml(a)system-techniques.com | Fairbanks, AK. 99709 | only on AXP | +---------------------------------------------------------------------+

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Powerline Broadband Usecases
by Noah 27 Sep '21

27 Sep '21

Hi Folks I would like to find out if there are any known State run broadband connectivity services for homes? I mean government providing IP based connectivity over grid power? Noah

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