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Re: Book / Literature Recommendations
by Larry Sheldon 17 Sep '14

17 Sep '14

On 9/16/2014 18:01, Miles Fidelman wrote: > Scott Weeks wrote: >> >>> On Sep 16, 2014, at 10:48 AM, James Bensley <jwbensley(a)gmail.com> wrote: >>> What is the single best book you have read on >>> networking? >> ----------------------------- >> >> >> Paper is soooo 20th century. C'mon, we're a decade and >> a half into the 21st century. :-) >> >> http://www.tcpipguide.com/free/t_toc.htm >> >> scott > Experience the power of the bookbook: > https://www.youtube.com/watch?v=MOXQo7nURs0 And I will tell you that when you are in a dark wiring closet trying to figure out how to "get into" an unfamiliar piece of equipment, a flashlight and the right collection of paper is priceless, while the cold, dark screen is worthless. I think of this "paperless" idiocy every time I write "20 reams of printer paper" on the grocery list. For the first half of my life -- maybe a little less -- I did not ever do that. Thanks, G*d, I no longer by 8½ X 11 and 11 X 17 fan-fold (½ of that green-bar). -- The unique Characteristics of System Administrators: The fact that they are infallible; and, The fact that they learn from their mistakes.

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Book / Literature Recommendations
by James Bensley 17 Sep '14

17 Sep '14

Hi All, What is the single best book you have read on networking? That's a wide topic so to clarify I'm talking about service provider networking but I do enjoy all aspects really and don't want to limit my self to one area of networking. I'm often reading technical books about technology X or protocol Y but they are generally explaining a new technology to me, how it works and how to use it (and how to configure it if its a book by a vendor like Juniper or Cisco). That is usually a learning exercise though required for an upcoming project or deliverable. I haven't read many vendor neutral books recently that explained concepts, or technologies, or paradigms that I found profound, radical and extremely useful. I feel like I'm just reading networking books these days to learn a new technology for a period of time (until a project completes) then moving on to the next technology (book). Longevity of the information doesn't seem as profound as it used to; BGP design principals will stay with me for decades until we reach the need for BGP v5 or similar, learning about 8b/10b encoding was interesting but not really required for my line of work more out of hobbyist interest and serves no practical purpose as a network engineer. Cheers, James.

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Re: Book / Literature Recommendations
by Scott Weeks 16 Sep '14

16 Sep '14

> On Sep 16, 2014, at 10:48 AM, James Bensley <jwbensley(a)gmail.com> wrote: > What is the single best book you have read on > networking? ----------------------------- Paper is soooo 20th century. C'mon, we're a decade and a half into the 21st century. :-) http://www.tcpipguide.com/free/t_toc.htm scott

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2000::/6
by Tarko Tikan 16 Sep '14

16 Sep '14

hey, 2000::/6 with aspath 3257 3549 has appeared in global routing table. Surely we can't be only ones seeing it. Looks like someone messed up interface/route config at 3549 by omitting 4 from the prefixlen. According to https://stat.ripe.net/2000%3A%3A%2F6#tabId=routing "2000::/6 is visible by 79% of 92 IPv6 RIS full peers." -- tarko

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Scotland ccTLD?
by Jay Ashworth 16 Sep '14

16 Sep '14

I know that IANA bases its list of ccTLDs on the 3166 list. Does anyone know if the 3166 secretariat has a preliminary choice in mind? I see press coverage of ".scot", but of course that's not germane. I see also a suggestion, credited to Dave Eastabrook (sp?) of .ab, which apparently stands for Alba, which I will assume has historical significance (the country name in Scots Gaelic, perhaps?) What kind of timeframe would a new ccTLD for a major country roll out on? Cheers, -- jra -- 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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QSFP 40G breakout cable
by Luan Nguyen 15 Sep '14

15 Sep '14

Hi folks, Anyone from the northern VA area has a couple extra of these? I'd like to borrow for a couple days to see if they work in other vendors' equipment? Believe it or not, Cisco' s one is much cheaper. Thanks! rg/lmn

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question - is there any tracking about how much bittorrent traffic there is across the various ISP's
by todd 15 Sep '14

15 Sep '14

I am looking for numbers on the amount of BitTorrent traffic flowing around the Internet today. Any idea where I could find both numbers of events and bytes used info? Todd -- Thanks, Todd S. Glassey [Personal Email] --------------------------- This email may contain confidential material protected as trade secrets and the like and as such is by default considered private and confidential in form. Without the word "PUBLIC:" as the opening tag in the Subject Line this email is to be considered confidential and may not be reproduced or excerpted in any form or disclosed to any unauthorized parties in any form; If this mail was forwarded or incorrectly sent to you please destroy it immediately.

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CEF problem - Traffic forwarding
by Mohamed Kamal 15 Sep '14

15 Sep '14

Hello, I have a very strange problem on my ASR-1006 BRAS router. This router is having two equal paths toward a P router via IS-IS. The BRAS is seeing the P router over the two paths and the two paths are installed in the RIB and FIB as follows: bng.rams.ca.asr1#sh ip cef 10.10.10.141 internal 10.10.10.141/32, epoch 3, RIB[I], refcount 6, per-longest-match-prefix sharing sources: RIB, LTE feature space: IPRM: 0x00028000 Broker: linked, distributed at 1st priority LFD: 10.10.10.141/32 1 local label local label info: global/592 contains path extension list disposition chain 0x7FCE5CB8C440 label switch chain 0x7FCE5CB82FC0 ifnums: GigabitEthernet0/0/0(8): 172.17.11.9 GigabitEthernet1/0/0(24): 172.17.11.17 path 7FCE67248388, path list 7FCE5FF51A40, share 1/1, type attached nexthop, for IPv4 MPLS short path extensions: MOI flags = 0x0 label implicit-null nexthop 172.17.11.9 GigabitEthernet0/0/0, adjacency IP adj out of GigabitEthernet0/0/0, addr 172.17.11.9 7FCE5C406958 path 7FCE6724B5B8, path list 7FCE5FF51A40, share 1/1, type attached nexthop, for IPv4 MPLS short path extensions: MOI flags = 0x0 label implicit-null nexthop 172.17.11.17 GigabitEthernet1/0/0, adjacency IP adj out of GigabitEthernet1/0/0, addr 172.17.11.17 7FCE5079A540 output chain: IP adj out of GigabitEthernet0/0/0, addr 172.17.11.9 7FCE5C406958 The problem is, CEF is seeing the two paths equal, but the output chain is only having one exit interface and the traffic is traversing this interface only! This is the interface config: bng.rams.ca.asr1#sh run all | sec 0/0/0 interface GigabitEthernet0/0/0 description "Connected to p1 router" mtu 1600 ip address 172.17.11.10 255.255.255.252 ip redirects ip unreachables ip proxy-arp ip mtu 1600 no ip load-sharing per-longest-match-prefix ip cef accounting non-recursive internal ip router isis ip flow monitor adsl input ip flow monitor adsl output ip pim dr-priority 1 ip pim query-interval 30 ip mfib forwarding input ip mfib forwarding output ip mfib cef input ip mfib cef output ip route-cache cef ip route-cache ip split-horizon ip igmp last-member-query-interval 1000 ip igmp last-member-query-count 2 ip igmp query-max-response-time 10 ip igmp version 2 ip igmp query-interval 60 ip igmp tcn query count 2 ip igmp tcn query interval 10 interface GigabitEthernet1/0/0 description " Connected to p1 router" mtu 1600 ip address 172.17.11.18 255.255.255.252 ip redirects ip unreachables ip proxy-arp ip mtu 1600 no ip load-sharing per-longest-match-prefix ip cef accounting non-recursive internal ip router isis ip flow monitor adsl input ip flow monitor adsl output ip pim dr-priority 1 ip pim query-interval 30 ip mfib forwarding input ip mfib forwarding output ip mfib cef input ip mfib cef output ip route-cache cef ip route-cache ip split-horizon ip igmp last-member-query-interval 1000 ip igmp last-member-query-count 2 ip igmp query-max-response-time 10 ip igmp version 2 ip igmp query-interval 60 ip igmp tcn query count 2 ip igmp tcn query interval 10 So, what do you think? Regards, Mohamed Kamal

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Re: Fwd: Interesting problems with using IPv6
by Scott Weeks 15 Sep '14

15 Sep '14

--- fergdawgster(a)mykolab.com wrote: From: Paul Ferguson <fergdawgster(a)mykolab.com> There's been a lot of on-and-off discussion about v6, especially about security and operational concerns about some aspects of IPv6 deployment, specifically regarding neighbor discovery (although there are other operational security concerns, as well). I'd like to provide this as an example of those concerns, without any additional commentary. :-) See also: http://www.ietf.org/mail-archive/web/ietf/current/msg89517.html -------------------------------------------------- I read the article and Tim Warnock on ipv6.org.au gave a pretty good and very brief summary. Pasted here for those that don't have time to read it. :-) "large L2 domain + ipv6 windows privacy extensions + some intel card bug + some mention of igmp snooping = multicast flood w/ high switch/router cpu..." Of course it's worth reading and there is a lot more to the post... scott

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Re: NANOG Digest, Vol 80, Issue 13
by Larry Sheldon 14 Sep '14

14 Sep '14

On 9/13/2014 17:12, Tor Nystrom wrote: > Sure np. I will pull the same data tomorrow and then again on Friday and from there on I will do it every Friday. [snip] > When replying, please edit your Subject line so it is more specific > than "Re: Contents of NANOG digest..." -- The unique Characteristics of System Administrators: The fact that they are infallible; and, The fact that they learn from their mistakes.

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