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Evil Bit and Spread Spectrum IP Addressing - NANOG Source Address Shaping
by Guru NANOG 05 Mar '12

05 Mar '12

Common Misconception: One additional bit of IPv4 Addressing will solve world hunger The Evil Bit (or spare unused bit) can be used to store (restore) one bit The Left-Most bit of the 32-bit Source Address Field can be SET to Zero no matter what the original value. The Evil bit can be set IFF the Left-Most bit is **changed**. Setting the Left-Most bit to zero **folds** this table in half. http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt Setting the Left-Most bit to ONE would move return traffic to the upper half of the Spectrum which has vast quantities of unused /8s Wide-spread consensus shows that TWO bits can work. Three bits folds the table to 1/8th. Governments want a 4-bit Return Prefix to their Super-Hubs for IPv6-like intercept. The U.S.FCC is expected to issue the regulations on how Spread Spectrum Source Address Shaping will work in their licensed CPE wireless devices. There are 160-bits in the deprecated header so there are many ways to go. One-Way Broadcast IP Addressing is now available. The Source Address Field is used for the second half of the 64-bit Destination Address. The DF (Did Flip) bit near the Evil Bit is used to note the two halves of the Destination Address have been *flipped*. NANOGers simply route 32 and then 32 after the flip based only on the Destination Field. There is no Source Address, only a channel (port). Keywords: WRT DNSMASQ Tomato WIFI Linux CPE

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which one a Technical Support or Help Desk
by Tarig Adam 05 Mar '12

05 Mar '12

I am working for a new Small ISP and we are trying to establish a center for receiving technical calls and inquires from customers and the technicians in this center may do some basics troubleshooting. What is the suitable title for this center and what we should call this people who do this job? Technical Support, Helpdesk, or Call Center. does each term has a specific meaning? And is there any standard structure of this center? And what is the relation of this people with other network/software Engineers? Thanks in advance. -- Tarig Adam

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Spread Spectrum IP Addressing - SOURCE Address Field ROTATED|shifted? Left 2 Bits
by Guru NANOG 04 Mar '12

04 Mar '12

Common Misconception With Spread Spectrum IP Addressing the 32-bit Source Address Field is Shifted LEFT 2-bits by the originator of the packet. That Folds the IPv4 Legacy Address Space into 1/4th tsize table The lost 2-bits are stored in the Right-Most 2 bits of the 32-bit field and in other places in the IPv4 Header The Destination can easily recover the Source Address - if the proper algorithms are in use Responses blindly sent back to the shifted Source Address may fall into agile hands or not With the advanced Spread-Spectrum techniques, additional addressing bits are created from the noise intentionally stored in the Right-Most 2 bits NANOG Operators buying /8s or /6s may want to look at the Spread-Spectrum CODE in the Linux-based CPE Routers The following table is deprecated and 1/4th the size: http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt With Spread-Spectrum collisions and mis-directions are OK and expected but other techniques ensure the packets get to the right place. http://NANOG.GURU

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IPv6 NIDS evasion and IPv6 fragmentation/reassembly improvements
by Fernando Gont 04 Mar '12

04 Mar '12

Folks, FYI, <http://blog.si6networks.com/2012/02/ipv6-nids-evasion-and-improvements-in.h…> It contains some test results regarding the implementation of RFC 5722 and draft-ietf-6man-ipv6-atomic-fragments. Thanks, -- Fernando Gont e-mail: fernando(a)gont.com.ar || fgont(a)si6networks.com PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1

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Re: is 74.218.84.10 a road runner IP address?
by Alex Conner 04 Mar '12

04 Mar '12

According to Whois that's a commercial roadrunner connection, and it falls in one of their netblocks. Plenty of info here: http://bgp.he.net/ip/74.218.84.10 > goemon(a)anime.net <mailto:goemon@anime.net> > March 3, 2012 9:45 PM > abuse(a)rr.com doesn't seem to think so. > > -Dan > > >

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NANOG Operational TTL Alert for 160-bit Headers (aka IPv4)
by Guru NANOG 04 Mar '12

04 Mar '12

Common Misconception - IPv4 is Out of Address Space NANOG Operational TTL Alert for 160-bit Headers (aka IPv4) The 8-bit TTL field is reduced to 4-bits plus two 11 bits stuck at 1 for a long time The new 8-bit fields are: SD11TTTT Packets without the 11 will enter Deep Packet Inspection processing (slow) SD are new Source and Destination Address bits set via the generic AAAA 128-bit records 4+8+12+30+6 = 60 + 68 = 128 VRHL+111.T1.000+Port12+30+Frag6 T1 sets the TTL bits - Use T0 at your own risk - VRHL=0101=5 NANOG.GURU.☺

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Common operational misconceptions
by John Kristoff 03 Mar '12

03 Mar '12

Hi friends, As some of you may know, I occasionally teach networking to college students and I frequently encounter misconceptions about some aspect of networking that can take a fair amount of effort to correct. For instance, a topic that has come up on this list before is how the inappropriate use of classful terminology is rampant among students, books and often other teachers. Furthermore, the terminology isn't even always used correctly in the original context of classful addressing. I have a handful of common misconceptions that I'd put on a top 10 list, but I'd like to solicit from this community what it considers to be the most annoying and common operational misconceptions future operators often come at you with. I'd prefer replies off-list and can summarize back to the list if there is interest. John

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Small ISP Need to Know
by not common 03 Mar '12

03 Mar '12

Hello, I work for an ISP (35K customers) and do System Admin work for operations and development (DNS, Radius and such). I want learn more on our IP side (Routing, BGP, MPLS, Core Network). I am trying to learn the Net Ops world piece by piece, and this is where I ask: Where is a good place (or places) to start learning ISP operations "Need To Know"? Thanks for your time

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IPv6 net tools
by Grupo IPv6 03 Mar '12

03 Mar '12

We are a group of students in telecommunications engineering from Uruguay. We are studying some network tools for our final project and we would like to know if someone could tell us which of this tools have IPv6 support: · Bprobe · Cprobe · Pathload · Pathrate · Pathchar · Clink · Nettimer · Spruce Thanks for your help!! Gianina

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Network Traffic Collection
by Maverick 03 Mar '12

03 Mar '12

Hello, I am trying to collect traffic traffic from pcap file and store it in a database but really confused how to organize it. Should I organize it on connection basis/ flow basis or IP basis. It might be an effort to write a customized traffic analysis tool like wireshark with only required functionality. I would really appreciate if someone can give me direction on write way of organizing the data because right now I only see individual packets and no way of putting them in some order. Best, Ali

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