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Li-Ji Hong (洪李吉)

Build Your Dream Internet with Li-Ji Hong (洪李吉)

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Cisco IOS/IOS XE Vulnerabiliy announced. Disable...

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2017/03/22

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 remote management. SSH is not vulnerable in this problem. The Jin-Dai Bridge (錦帶橋) inDahu Park (大湖公園).Taipei City, Taiwan. You can read the original announcement for technical details. Cisco IOS and

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Do more with “the same”

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2016/08/24

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 Folkgame Festival (YICFFF, 宜蘭國際童玩藝術節).Yilan County, Taiwan. The problem of “do more with less” With the word “less”, what does that mean? Does that imply we don’t need that much budgets anymore? Does

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CCNA v3 Exam is cheaper than v2

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2016/05/18

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 US$ 45 less than before. This is great! Isn’t it! You can take v3 now Just like before, you can now book CCNA v3 exam on VUE.com. The new exam code for v3 is “200-125”. If you cannot find this

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Diffie and Hellman Receive Turing Award 2015

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2016/03/02

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. Captured on ACM Official Website. I am not going to dig in the details about the mathematics behind Diffie-Hellman method. I just want you to know Mr. Diffie and Mr. Hellman receive Turing Award 2015

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Increase iPhones’ battery life by removing...

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2016/02/23

I came across a new RFC 7772: “Reducing Energy Consumption of Router Advertisements”. I want to share my learnings after reading this RFC. Internet Engineering Task Force (IETF) Logo, captured on Wikipedia. I intentionally mentioned “iPhone” at the subject to have your attention. Actually, the whole discussion applies to any mobile devices with limited battery capacity, such as smart phones and tablet computers. It is quite obvious mobile devices will consume more power while awake than

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Update your Cisco ASA OS ASAP!

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2016/02/16

I just want to make sure you have known this news and updated your Cisco ASA OS already. Cisco announced a "critical" vulnerability of Cisco ASA OS and released patched OS for them at the same time. Hackers could make use of this vulnerability to gain control of your Cisco ASA. The first fixed version of ASA OS to fix this problem.Screen captured on Cisco's web site. Vulnerable Products Cisco ASA Software is affected by this vulnerability if the system is configured to terminate IKEv1 or

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Cisco IOS OSPF Hidden Command: show ip ospf route

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2015/10/13

I saw this Cisco IOS hidden command show ip ospf route for OSPF in this post. I tried to create a running example for myself so I can learn more about this hidden command. 【Output at R4】 R4#show ip ospf route OSPF Router with ID (1.0.0.4) (Process ID 1) Base Topology (MTID 0) Area 4 Intra-area Route List * 4.0.1.0/24, Intra, cost 64, area 4, Connected via 4.0.1.4, Serial1/0 * 4.0.2.0/24, Intra, cost 64, area 4, Connected via 4.0.2.4, Serial1/1 Intra-area

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Checking system-wide uptime on several Cisco hardware...

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2015/06/21

We all know adding redundant supervisors/CPUs to any given system, we can increase the uptime for that system. With In-Service Software Upgrade (ISSU), Cisco hardware even allow us to upgrade the operating system software on-the-fly without stopping the whole system. Flowers ofCassia fistulawas blooming together in southern Taiwan starting from mid-May.This photo was taken around this location in Baihe District of Tainan City, Taiwan. An interesting question might be asked. Does Cisco hardware

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Site-to-site IPSec VPN Configuration Example...

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2015/05/12

Packet Tracer Version 5.2 Site-to-site IPSec VPN Configuration Example (pt-ipsec.pkt) Summary of configuration steps is in below. 1. Define Transform Sets. ! crypto ipsec transform-set MOSTSECURE esp-aes 256 esp-sha-hmac ! 2. Define IPSec Crypto Map ! access-list 100 permit ip 10.1.1.0 0.0.0.255 10.2.2.0 0.0.0.255 ! crypto map PT-IPSEC 1000 ipsec-isakmp description Packet Tracer IPSEC Test Crypto Map set peer 172.16.2.1 set pfs group5 set security-association lifetime seconds 120 set

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Why should we turn off mobile phones when we travel...

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2015/04/11

With discussion in previous post, we now know the mobile phone’s GSM TDMA signal pattern would generate buzzing sound on audio speakers. Now, how this is buzzing sound related to the safety of air planes? After watching many videos of “Mayday, Air Crash Investigation” TV programs, I start to understand that today’s plane communications are still running analog technologies. Pilots would hear the buzzing sound generated by your mobile phone. Fresh tomatos. Photo taken in Hsinchu County,

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