PODCAST · education
Show IP Protocols
by Li-Ji Hong (洪李吉)
Audio version of Blog "Show IP Protocols".
Episodes
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Breaking 100K Entries is the Global IPv6 BGP Table
This year, 2020, around November I started to see the global IPv6 BGP Table is getting more than 100K entries. Although the number is going above and under 100K from time to time, starting from the end of November I can safely say it is breaking 100K entries right now. This is an interesting...
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Three possible scenarios of Software Defined Networking (SDN)
Software-defined networking (SDN) is an approach to create a centrally controlled programmable packet network. Any protocols with the same approach could be considered as SDN as well. For open protocols, we have one popular standard protocol “OpenFlow” talking among the central controllers to all...
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Where do we use Cisco Wildcard Masks?
People might still be interested in about Cisco Wildcard Masks. I try to summarize interesting information about Wildcard Masks in this post. Use Case 1: IPv4 Access Control Lists on Cisco IOS, IOS XE, and IOS XR Wildcard masks are for us to select only subsets of IPv4 addresses. When we define...
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Revised post: Covering Subnet Calculator to understand more about Wildcard Mask
This tool is an update to my previous post: Simple visual tool to calculate Cisco IOS Wildcard Mask Notes for Cisco IOS Wildcard Mask You can simply assume Cisco IOS Wildcard Mask are derived by mapping 1s to 0s and 0s to 1s of equivalent subnet mask in binary notation. By definition, “0” bits in…
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Global BGP IPv4 table is around 800K in size
This week the global BGP IPv4 table is around 800,000 entries in size. I bring this up just to give you a head-up and say a “Wow”. I don’t want to make you worry about the number. This is not my intention. I still remember the “old good time” when I had installed a BGP router (Cisco 3660) with…
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Scanning active IPv4 addresses is difficult? Simpler than you think
It is always a best practice to keep full track of all IP address assignments inside our local area network. From time to time, it might also be a good idea for security purposes to check whether we have any hidden nodes inside our network. To discover any node with active IP addresses inside our...
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CCNA 2020, My summary of changes
Cisco recently announced major changes of certification programs and they all will take place on February 24, 2020. In this post, I am giving you my quick summary on CCNA alone. CCNA Exam Changes (200-301) The official new exam name for CCNA 2020 is “Cisco Certified Network Associate v2.0 (CCNA...
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Google is terminating Google+ service
Hi, this is Li-Ji Hong speaking. We now know Google is terminating Google+ service. I understand that many of you came from Google+ to find and visit my web site “Show IP Protocols”. To keep updated and connected to my web site “Show IP Protocols”, I recommend you adding at least one of these…
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400G Ethernet, My Observation Notes
I saw a post about Cisco has announced 400G Ethernet switch products. 400G Ethernet means the bit rate can be up to 400 Gbps. Here are some of my observation notes on 400G Ethernet products. Cisco announced four models of Nexus 400G switches Screen capture on Cisco.com In the product page, Cisco...
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Bank lost 1 million US Dollars because of outdated routers
A recent news was about hackers hacked into a Russian bank because of outdated routers. When I saw the keyword “router”, I felt that I must dig further about what really happened. What I have understood now The victim is PIR Bank. One of the suspects is MoneyTaker. After the breach, PIR Bank…
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BGP Injection instead of Leak, my observation notes for MyEtherWallet incident
After reading articles by Doug Madory, and by Louis Poinsignon, here are some notes I observed and learned. [What happened in this incident?] Hackers somehow made some BGP routers of “eNet” to falsely announce that they own the following 5 IP subnets, which are indeed NOT belonging to “eNet”. The...
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Prepare Python 2.7 on Microsoft Windows using PowerShell
Everyone today talks about the programming language Python while discussing Software-defined Networking (SDN). Since Python is so popular, it would be a good idea for network administrators to know more about Python. First thing first. I talk about how I prepare Python running environment on...
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Starting IS-IS routing protocol without CCNP training
The routing protocol Intermediate System to Intermediate System (IS-IS) is an advanced and robust link-state protocol used in many service provider networks. Most of the other enterprises I know of prefer to use protocols like OSPF or EIGRP instead of IS-IS. Therefore, enterprise administrators...
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How do we repair a broken submarine fiber cable?
(Updated here: https://showipprotocols.blogspot.com/2025/01/how-do-we-fix-broken-submarine-fiber.html) On April 22, 2017, one segment of Asia-Pacific Cable Network 2 (APCN2) that serves Taiwan’s major Internet connectivity with Japan, Europe, and America, was broken. According to some news…
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Clear configured allowed VSAN list on trunk ports of Cisco MDS
A friend asked a good question about how this command works on Cisco MDS FibreChannel switch: “switchport trunk allowed vsan all”. To my surprise, I cannot find any specific official documents to explain it clearly. I did some experiment on one Cisco MDS 9148. And here is my conclusion. Bay…
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Cisco IOS/IOS XE Vulnerabiliy announced. Disable TELNET fast
This is just a short notice for you in case you are not aware of it. Cisco announced a vulnerability on Cisco IOS and IOS XE operating system. For short, you only have to disable incoming TELNET service onto the router itself to avoid this vulnerability. You can use Secure Shell (SSH) instead for...
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Do more with “the same”
To emphasis the effectiveness of a new tool, we always hear some people say it would make you “do more with less”. This is so attractive to Chief Officers. How would the other staffs think about this? Dongshan River Water Park (冬山河親水公園). The venue of Yilan International Children's Folklore and...
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CCNA v3 Exam is cheaper than v2
I create this post just to remind you in case you did not notice it yet. Shihmen Dam (石門水庫), Taoyuan City, Taiwan. (Wikipedia) Version 3 Exam costs $250 CCNA Routing Switching Version 3 exam cost is now US$ 250. This is a good news because in v2 the exam cost was US$ 295. That is, the new exam is...
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Diffie and Hellman Receive Turing Award 2015
When we study IPSec, we know Mr. Diffie and Mr. Hellman invented a method in year 1976 that is the core of Internet Key Exchange (IKE) to create mutually shared secret. We also have to specify and configure DH Group Number in ISAKMP policy sets (crypto-map in Cisco IOS). A.M. Turing Award Logo....
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ABOUT THIS SHOW
Audio version of Blog "Show IP Protocols".
HOSTED BY
Li-Ji Hong (洪李吉)
CATEGORIES
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Show IP Protocols currently has 25 episodes available on PodParley. New episodes are automatically indexed when they're published to the podcast feed.
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Audio version of Blog "Show IP Protocols".
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Show IP Protocols has 25 episodes. Check the episode list to see recent publication dates and frequency.
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Show IP Protocols is created and hosted by Li-Ji Hong (洪李吉).
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