JANOG is a Japanese networking forum that has been running since 1997. It holds biannual meetings over three days that feature technical presentations and discussions mostly in Japanese. Meetings attract 800+ attendees in Tokyo and 500+ in other cities. Topics recently discussed include software vs hardware forwarding, net neutrality, MVNOs, Internet infrastructure in Asia, and BGP hijacking. JANOG also organizes interim meetings, lightning talks, and a fellowship program to engage younger members. It is run entirely by volunteers through a steering committee and relies on member participation.
The document discusses a large-scale BGP hijack incident that occurred on November 6, 2015 where AS9498 (Bharati Airtel) advertised over 16,000 prefixes, including some belonging to AS2914 (NTT Communications). The author analyzes the incident and discusses typical root causes of BGP hijacks as well as measures that can be taken to prevent them, such as applying strict BGP prefix filters and implementing BGP origin validation.
NANOG52 - OCN Experience to Handle the Internet Growth and the FutureChika Yoshimura
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This document discusses issues related to Internet traffic growth and network design at OCN, a major ISP in Japan. It summarizes that Internet traffic and routing tables are growing significantly each year, posing challenges for backbone networks. Specifically, OCN is facing issues with large forwarding information bases slowing route convergence, and uneven traffic load balancing across link aggregation groups due to limited hash elements. The document outlines OCN's network architecture and plans to address these problems through techniques like hierarchical forwarding to improve convergence times and more hash parameters to balance traffic flow.
NANOG32 - DNS Anomalies and Their Impacts on DNS Cache ServersChika Yoshimura
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1. Virus and worm activity, such as the Antinny worm, can overload DNS cache servers by repeatedly querying for domain names. When the authoritative server removed the A record in response, cache servers were flooded with over 700 queries per second.
2. Large RRSets that exceeded 512 bytes in size caused cache servers to switch to TCP queries when authoritative servers returned a truncated response. However, if the authoritative servers did not support TCP or EDNS0, the cache servers would time out while waiting for a response.
3. Lessons learned include recommending that authoritative server administrators check settings to support TCP queries, limit RRSet sizes, and consider generic blackhole addresses for DDoS mitigation rather than removing
This document provides a summary of AS112 activities and reports. It discusses the AS112 project, which provides DNS services for private address spaces. It notes that AS112 sees around 30% dynamic DNS updates, 48% SOA queries, and 21% PTR queries. It also discusses OCN's involvement as a participant in AS112 and operator of DNS servers for the project. The document provides statistics on query types and links to relevant Internet-Drafts and information sources.
APRICOT 2012 - ?Living with the ever-growing BGP table: an OCN storyChika Yoshimura
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This document contains diagrams and descriptions of NTT Communications' global IP network and backbone infrastructure. The following key points are discussed:
- NTT has POPs and peering points across Asia, Europe, and North America that are connected by its global and regional backbones.
- The Japanese backbone connects 13 POPs across the country with capacities ranging from 1Gbps to 480Gbps.
- NTT's core routers in Tokyo and Osaka exchange traffic between Japan, Asia, Europe, and North America with capacities up to 560Gbps and 480Gbps respectively.
- Details are provided on NTT's transition to new backbone and peering technologies over time, including the initial backbone in 1996 and upgrades
APRICOT 2011 - OCN Experience to Handle the Traffic Growth and the FutureChika Yoshimura
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Internet traffic in Japan has been growing consistently, increasing 17.8% in 2010 compared to the previous year. As an internet service provider, OCN faces challenges in scaling its backbone network to handle rising traffic volumes. Specifically, OCN struggles with the scalability of router forwarding tables as routing tables expand dramatically. When link failures occur, full table updates take significant time, disrupting services. OCN also experiences traffic imbalance issues across its numerous link aggregation interfaces as flows are distributed non-uniformly. To address these problems, OCN is implementing hierarchical forwarding tables and improving hash algorithms for link aggregation.
JANOG is a community of over 6,700 network engineers in Japan founded in 1997 that discusses technical and operational issues across organizations. It holds semiannual two-day meetings with presentations and discussions primarily in Japanese. Meetings typically attract 800 attendees in Tokyo and 400 elsewhere. Topics have included traffic engineering, data center routing, and best operational practices. It is run by volunteers and supported by hosts, sponsors, and donations.
NANOG52 - OCN Experience to Handle the Internet Growth and the FutureChika Yoshimura
?
This document discusses issues related to Internet traffic growth and network design at OCN, a major ISP in Japan. It summarizes that Internet traffic and routing tables are growing significantly each year, posing challenges for backbone networks. Specifically, OCN is facing issues with large forwarding information bases slowing route convergence, and uneven traffic load balancing across link aggregation groups due to limited hash elements. The document outlines OCN's network architecture and plans to address these problems through techniques like hierarchical forwarding to improve convergence times and more hash parameters to balance traffic flow.
NANOG32 - DNS Anomalies and Their Impacts on DNS Cache ServersChika Yoshimura
?
1. Virus and worm activity, such as the Antinny worm, can overload DNS cache servers by repeatedly querying for domain names. When the authoritative server removed the A record in response, cache servers were flooded with over 700 queries per second.
2. Large RRSets that exceeded 512 bytes in size caused cache servers to switch to TCP queries when authoritative servers returned a truncated response. However, if the authoritative servers did not support TCP or EDNS0, the cache servers would time out while waiting for a response.
3. Lessons learned include recommending that authoritative server administrators check settings to support TCP queries, limit RRSet sizes, and consider generic blackhole addresses for DDoS mitigation rather than removing
This document provides a summary of AS112 activities and reports. It discusses the AS112 project, which provides DNS services for private address spaces. It notes that AS112 sees around 30% dynamic DNS updates, 48% SOA queries, and 21% PTR queries. It also discusses OCN's involvement as a participant in AS112 and operator of DNS servers for the project. The document provides statistics on query types and links to relevant Internet-Drafts and information sources.
APRICOT 2012 - ?Living with the ever-growing BGP table: an OCN storyChika Yoshimura
?
This document contains diagrams and descriptions of NTT Communications' global IP network and backbone infrastructure. The following key points are discussed:
- NTT has POPs and peering points across Asia, Europe, and North America that are connected by its global and regional backbones.
- The Japanese backbone connects 13 POPs across the country with capacities ranging from 1Gbps to 480Gbps.
- NTT's core routers in Tokyo and Osaka exchange traffic between Japan, Asia, Europe, and North America with capacities up to 560Gbps and 480Gbps respectively.
- Details are provided on NTT's transition to new backbone and peering technologies over time, including the initial backbone in 1996 and upgrades
APRICOT 2011 - OCN Experience to Handle the Traffic Growth and the FutureChika Yoshimura
?
Internet traffic in Japan has been growing consistently, increasing 17.8% in 2010 compared to the previous year. As an internet service provider, OCN faces challenges in scaling its backbone network to handle rising traffic volumes. Specifically, OCN struggles with the scalability of router forwarding tables as routing tables expand dramatically. When link failures occur, full table updates take significant time, disrupting services. OCN also experiences traffic imbalance issues across its numerous link aggregation interfaces as flows are distributed non-uniformly. To address these problems, OCN is implementing hierarchical forwarding tables and improving hash algorithms for link aggregation.
JANOG is a community of over 6,700 network engineers in Japan founded in 1997 that discusses technical and operational issues across organizations. It holds semiannual two-day meetings with presentations and discussions primarily in Japanese. Meetings typically attract 800 attendees in Tokyo and 400 elsewhere. Topics have included traffic engineering, data center routing, and best operational practices. It is run by volunteers and supported by hosts, sponsors, and donations.