July 2014 - Test - lists.nanog.org

common checks performed when passing on an IPv4 PA allocation from one end-customer to another
by Martin T 23 Feb '16

23 Feb '16

Hi, when one end-customer has been using for example /24 IPv4 allocation for a while and returns this(for example changes an ISP) to LIR, then are there some good practices before handing out this same /24 to a new customer? I guess LIR should: 1) remove all the DNS PTR records, classless of classful delegations 2) check if some of the IP addresses are in DNSBL(maybe the previous customer was a spammer). Example with 93.184.216.0/24: $ for ip in {0..255}.216.184.93;\ > do for addr in \ > cbl.abuseat.org \ > dnsbl.inps.de \ > no-more-funn.moensted.dk \ > dnsbl.sorbs.net \ > bl.spamcannibal.org \ > bl.spamcop.net \ > psbl.surriel.com \ > dnsrbl.swinog.ch; \ > do dig @8.8.8.8 "$ip"."$addr" +short | grep -q "^127.0.0." && \ > echo "DNSBL-Alarm: $ip is listed on $addr"; done; done $ Anything else? regards, Martin

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Big day for IPv6 - 1% native penetration
by Tomas Podermanski 06 Jan '16

06 Jan '16

Hi, It seems that today is a "big day" for IPv6. It is the very first time when native IPv6 on google statistics (http://www.google.com/intl/en/ipv6/statistics.html) reached 1%. Some might say it is tremendous success after 16 years of deploying IPv6 :-) T.

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VZW - fixed wireless services?
by Ryan Finnesey 20 Jun '15

20 Jun '15

Does anyone know if Verizon is using its LTE network to offer fixed wireless services? I know Sprint was working on WiMAX hardware with cisco but I assume that was canceled when Sprint started moving to LTE. Cheers Ryan

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How are you doing DHCPv6 ?
by Randy Carpenter 02 Apr '15

02 Apr '15

I am wondering how people out there are using DHCPv6 to handle assigning prefixes to end users. We have a requirement for it to be a redundant server that is centrally located. DHCPv6 will be relayed from each customer access segment. We have been looking at using ISC dhcpd, as that is what we use for v4. However, it currently does not support any redundancy. It also does not do very much useful logging for DHCPv6 requests. Certainly not enough to keep track of users and devices. So, my questions are: How are you doing DHCPv6 with Prefix Delegation? What software are you using? When DHCPv6 with Prefix Delegation seems to be about the only way to deploy IPv6 to end users in a generic device-agnostic fashion, I am wondering why it is so difficult to find a working solution. thanks, -Randy -- | Randy Carpenter | Vice President - IT Services | Red Hat Certified Engineer | First Network Group, Inc. | (800)578-6381, Opt. 1 ----

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Generating IPv6 list with filtergen.level3.net
by Smith, Courtney 28 Mar '15

28 Mar '15

Anyone out there know how to generate a IPv6 list Level3's filtergen? I tried Google but didn't find anything. () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments

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New BCOPs in Progress
by Chris Grundemann 25 Mar '15

25 Mar '15

Hail NANOGers! As most of you hopefully know, NANOG now has a BCOP Ad Hoc Committee and we are pushing forward with new BCOPs! http://nanog.org/governance/bcop We currently have three BCOPs in active development: eBGP configuration, shepherd Bill Armstrong Public Peering Exchange update, shepherd Shawn Hsiao Ethernet OAM, shepherd Mark Calkins All three of these nascent BCOPs will be presented in the BCOP Track on Monday: http://nanog.org/meetings/abstract?id=2348 We have also collected a list of Appeals (BCOPs that need to be written): http://bcop.nanog.org/index.php/Appeals If you would like to help out with any of these BCOPs (or others yet to be identified) please join the BCOP mailing list and reach out to the shepherd (if applicable of course): http://mailman.nanog.org/mailman/listinfo/bcop Our committee is brand new and we are still finding and smoothing wrinkles, etc. We would love your help in any capacity. As a BCOP shepherd or SME or just to point out potential pit falls or room for improvement, with the process, the wiki, a BCOP or anything at all really. This is a bottom-up, community led effort and it will only succeed with your help - join us in creating what I believe will be a vital and long-lasting institution! Cheers, ~Chris -- @ChrisGrundemann http://chrisgrundemann.com

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The state of TACACS+
by Robert Drake 05 Jan '15

05 Jan '15

Ever since first using it I've always liked tacacs+. Having said that I've grown to dislike some things about it recently. I guess, there have always been problems but I've been willing to leave them alone. I don't have time to give the code a real deep inspection, so I'm interested in others thoughts about it. I suspect people have just left it alone because it works. Also I apologize if this is too verbose or technical, or not technical enough, or just hard to read. History: TACACS+ was proposed as a standard to the IETF. They never adopted it and let the standards draft expire in 1998. Since then there have been no official changes to the code. Much has happened between now and then. I specifically was interested in parsing tac_plus logs correctly. After finding idiosyncrasies I decided to look at the source and the RFC to see what was really happening. Logging, or why I got into this mess: In the accounting log, fields are sometimes logged in different order. It appears the client is logging whatever it receives without parsing it or modifying it. That means the remote system is sending them in different orders, so technically the fault lies with them. However, it seems too trusting to take in data and log it without looking at it. This can also cause issues when you send a command like (Cisco) "dir /all nvram:" on a box with many files. The device expands the command to include everything on the nvram (important because you might want to deny access to that command based on something it expanded), but it gets truncated somewhere (not sure if it's the device buffer that is full, tac_plus, or the logging part. I might tcpdump for a while to see if I can figure out what it looks like on the wire) I'm not sure if there are security implications there. Encryption: The existing security consists of md5 XOR <content> with the md5 being composed of a running series of 16 byte hashes, taking the previous hash as part of the seed of the next hash. A sequence number is used so simple replay shouldn't be a factor. Depending on how vulnerable iterative md5 is to it, and how much time you had to sniff the traffic, I would think this would be highly vulnerable to chosen plaintext if you already have a user-level login, or at least partial known plaintext (with the assumption they make backups, you can guess that at least some of the packets will have "show running-config" and other common commands). They also don't pad the encrypted string so you can guess the command (or password) based on the length of the encrypted data. For a better description of the encryption you can read the draft: http://tools.ietf.org/html/draft-grant-tacacs-02 I found an article from May, 2000 which shows that the encryption scheme chosen was insufficient even then. http://www.openwall.com/articles/TACACS+-Protocol-Security For new crypto I would advise multiple cipher support with negotiation so you know what each client and server is capable of. If the client and server supported multiple keys (with a keyid) it would be easier to roll keys frequently, or if it isn't too much overhead they could use public key. Clients: As for clients, Wikipedia lists several that seem to be based on the original open-source tac_plus from Cisco. shrubbery.net has the "official" version that debian and freebsd use. I looked at some of the others and they all seemed to derive from Cisco's code directly or shrubbery.net code, but they retained the name and started doing their own versioning. All the webpages look like they're from 1995. In some cases I think it's intentional but in some ways it shows a lack of care for the code, like it's been dropped since 2000. Documentation is old: This only applies to shrubbery.net's version. I didn't look at the other ones that closely. While all of it appears valid, one Q&A in the FAQ was about IOS 10.3/11.0. Performance questions use the sparc 2 as a target machine. There isn't an INSTALL or README, just the FAQ/CHANGES/COPYING (and a tac_plus.conf manpage), so the learning curve for new users is probably pretty steep. Also there isn't a clear maintainer. The best email address I found was listed in the tacacs+.spec file, for packaging on rpm systems. If you hit the website they give some hints with some outdated, though still functional links. And they list the official email as tac_plus(a)shrubbery.net Conclusion: Did everyone already know this but me? If so have you moved to Kerberos? Can Kerberos do everything TACACS+ was doing for router authorization? I've got gear that only supports radius and tacacsplus, so in some cases I have no choice but to use one of those, neither of which I would trust over an unencrypted wire. If TACACS+ isn't a dead end then it needs a push to bring the protocol to a new version. There are big name vendors involved in making supported clients and servers. There should be someone invested in keeping it secure and adding features.

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pay.gov and IPv6
by Matthew Kaufman 27 Oct '14

27 Oct '14

Random IPv6 complaint of the day: redirects from FCC.gov to pay.gov fail when clients have IPv6 enabled. Work fine if IPv6 is off. One more set of client computers that should be dual-stacked are now relegated to IPv4-only until someone remembers to turn it back on for each of them... sigh. Matthew Kaufman

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Call for Presentations RIPE 69
by Filiz Yilmaz 09 Sep '14

09 Sep '14

Dear colleagues, Please find the CFP for RIPE 69 in London below. The deadline for submissions is 31 August 2014. Please also note that speakers do not receive any extra reduction or funding towards the meeting fee at the RIPE Meetings. Kind regards Filiz Yilmaz RIPE PC Chair http://www.ripe.net/ripe/meetings/ripe-meetings/pc --------------------- Call for Presentations A RIPE Meeting is an open event where Internet Service Providers, network operators and other interested parties get together. Although the meeting is mostly technical, it is also a chance for people to meet and network with others in their field. RIPE 69 will take place from 3- November 2014 in London, UK. The RIPE Programme Committee (PC) is now seeking content proposals from the RIPE community for the plenary session presentations, BoFs (Birds of a Feather sessions), panels, workshops, tutorials and lightning talks at RIPE 69. The PC is looking for presentations covering topics of network engineering and operations, including but not limited to: • IPv6 deployment • Managing IPv4 scarcity in operations • Commercial transactions of IPv4 addresses • Data centre technologies • Network and DNS operations • Internet governance and regulatory practices • Network and routing security • Content delivery • Internet peering and mobile data exchange Submissions RIPE Meeting attendees are quite sensitive to keeping presentations non-commercial, and product marketing talks are strongly discouraged. Repeated audience feedback shows that the most successful talks focus on operational experience, research results, or case studies. For example, presenters wishing to describe a commercial solution should focus on the underlying technology and not attempt a product demonstration. The RIPE PC accepts proposals for different presentation formats, including plenary session presentations, tutorials, workshops, BoFs (Birds of a Feather sessions) and lightning talks. See the full descriptions of these formats at https://ripe69.ripe.net/submit-topic/presentation-formats/ Presenters who are proposing a panel or BoF are encouraged to include speakers from several (perhaps even competing) companies and/or a neutral facilitator. In addition to presentations selected in advance for the plenary, the RIPE PC also offers several time slots for “lightning talks”, which are selected immediately before or during the conference. The following general requirements apply: - Proposals for plenary session presentations, BoFs, panels, workshops and tutorials must be submitted for full consideration no later than 31 August 2014, using the meeting submission system at https://ripe69.ripe.net/submit-topic/guidelines/. Proposals submitted after this date will be considered on a space-available basis. - Lightning talks should also be submitted using the meeting submission system (https://ripe69.ripe.net/submit-topic/submission-form/) and can be submitted just days before the RIPE Meeting starts or even during the meeting week. The allocation of lightning talk slots will be announced in short notice – in some cases on the same day but often one day prior to the relevant session. - Presenters should indicate how much time they will require. See more information on time slot allocations per presentation format at https://ripe69.ripe.net/submit-topic/presentation-formats/ - Proposals for talks will only be considered by the PC if they contain at least draft presentation slides (slides may be updated later on). For panels, proposals must contain a clear description, as well as the names of invited panelists, presenters and moderators. - Due to potential technical issues, it is expected that most, if not all, presenters/panelists will be physically present at the RIPE Meeting. If you have any questions or requests concerning content submissions, please email pc [at] ripe [dot] net. ---------------------

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Muni Fiber and Politics
by Jay Ashworth 15 Aug '14

15 Aug '14

Over the last decade, 19 states have made it illegal for municipalities to own fiber networks -- encouraged largely, I am told, by Verizon and other cable companies/MSOs[1]. Verizon, of course, isn't doing any new FiOS deployments, per a 2010 press release[2]. FCC Chair Tom Wheeler has been making noises lately that he wants the FCC to preempt the field on this topic, making such deployments legal. Congressional Republicans think that's a bad idea: http://www.vox.com/2014/7/20/5913363/house-republicans-and-obamas-fcc-are-a… [ and here's the backgrounder on the amendment: http://www.broadcastingcable.com/news/washington/blackburn-bill-would-block… ] While I generally try to avoid bringing up topics on NANOG that are political; this one seems to be directly in our wheelhouse, and unavoidably political. My apologies in advance; let's all try to be grownups, shall we? Cheers, -- jra [1] http://motherboard.vice.com/read/hundreds-of-cities-are-wired-with-fiberbut… [2] https://secure.dslreports.com/shownews/Verizon-Again-Confirms-FiOS-Expansio… -- Jay R. Ashworth Baylink jra(a)baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274

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