andreyka26_se
0.0.0.0/0 CIDR - what is that, and why? If you ever configured routing in cloud, or locally on the machine - you have probably seen it. What is CIDR? I will do more detailed post later, but this is the most common way of defining BUNCH of IPs in single…
Following up my own question I asked myself. Why
Any address
The thing is that it is enforced by linux kernel for routing table. Linux implement Longest Prefix Match (TRIE) for these CIDRs, and canonically host part should be zeroed: https://www.rfc-editor.org/rfc/rfc9164.html#section-4.3
It means our earlier example
To play with routes/CIDRs: https://tools.andreyka26.com/ip-checker
#kernel #network
0.0.0.0?Any address
/0 (taking ZERO leftmost bits) will give ZERO. So we can as well define it as 1.1.1.1/0 or 1.2.3.4/0??The thing is that it is enforced by linux kernel for routing table. Linux implement Longest Prefix Match (TRIE) for these CIDRs, and canonically host part should be zeroed: https://www.rfc-editor.org/rfc/rfc9164.html#section-4.3
It means our earlier example
1.2.3.0/24 will be rejected if defined like that 1.2.3.100/24 (however technically still it works)To play with routes/CIDRs: https://tools.andreyka26.com/ip-checker
#kernel #network
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andreyka26_se
0.0.0.0/0 CIDR - what is that, and why? If you ever configured routing in cloud, or locally on the machine - you have probably seen it. What is CIDR? I will do more detailed post later, but this is the most common way of defining BUNCH of IPs in single…
One of the applications for CIDR and 0.0.0.0/0 is cloud routing table configuration.
As shown on the screenshot:
- 10.0.0.0/16 we have private IPv4 address range that will be routed to locally (within VPC in case of AWS)
- 0.0.0.0/0 for everything else the request will use Internet Gateway Interface (and consequently, usually, will make it to outside internet).
#network
As shown on the screenshot:
- 10.0.0.0/16 we have private IPv4 address range that will be routed to locally (within VPC in case of AWS)
- 0.0.0.0/0 for everything else the request will use Internet Gateway Interface (and consequently, usually, will make it to outside internet).
#network
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Now as you see the Longest Prefix Match usage in WHOLE INTERNET.
Here is good leetcode problem to remind yourself how it works: https://leetcode.com/problems/implement-trie-prefix-tree/description/
Here is good leetcode problem to remind yourself how it works: https://leetcode.com/problems/implement-trie-prefix-tree/description/
LeetCode
Implement Trie (Prefix Tree) - LeetCode
Can you solve this real interview question? Implement Trie (Prefix Tree) - A trie [https://en.wikipedia.org/wiki/Trie] (pronounced as "try") or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There…
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Daily 410th day streak
Amazing problem, has 2 patterns, classic, easy to understand one. I do recommend. And it is not really hard
https://leetcode.com/problems/minimum-operations-to-reduce-x-to-zero/description/?envType=daily-question&envId=2026-09-23
#daily #medium #pattern
Amazing problem, has 2 patterns, classic, easy to understand one. I do recommend. And it is not really hard
https://leetcode.com/problems/minimum-operations-to-reduce-x-to-zero/description/?envType=daily-question&envId=2026-09-23
#daily #medium #pattern
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Daily 411th day streak
Easy, 1 min coding, no pattern though.
https://leetcode.com/problems/smallest-index-with-digit-sum-equal-to-index/description/?envType=daily-question&envId=2026-09-24
#daily #easy #nopattern
Easy, 1 min coding, no pattern though.
https://leetcode.com/problems/smallest-index-with-digit-sum-equal-to-index/description/?envType=daily-question&envId=2026-09-24
#daily #easy #nopattern
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Question: is it only me???
I either only work "just enough to have an update tomorrow", or I go into superman mode 12+ hours a day.
Besides that, I can't perceive work as 8 hours a day of handling a stream of tasks, equally motivated and at equal speed. To be productive, I need to see the chunk of work, work on it till the end, chill a bit, and then start a new one.
However, I know some folks at work who just do their job equally well from 9 to 18, and it seems like it doesn't matter much how and what they get assigned. And they usually stop PRECISELY at 18:00. I cannot do that. If I feel like I want to finish I would work till mental feeling of "okay it is done", then I can come later at work or whatever.
I either only work "just enough to have an update tomorrow", or I go into superman mode 12+ hours a day.
Besides that, I can't perceive work as 8 hours a day of handling a stream of tasks, equally motivated and at equal speed. To be productive, I need to see the chunk of work, work on it till the end, chill a bit, and then start a new one.
However, I know some folks at work who just do their job equally well from 9 to 18, and it seems like it doesn't matter much how and what they get assigned. And they usually stop PRECISELY at 18:00. I cannot do that. If I feel like I want to finish I would work till mental feeling of "okay it is done", then I can come later at work or whatever.
👍8❤2
Maybe not all of you know, but I do not support idea of discipline 😆😆 at least the way I understand it.
It might seem I am very disciplined grinder: system design, 800 problems solved on Leetcode, 8 years doing gym so-so consistently, deep-dives into how something works on the fundamental level just to be better engineer.
It was ALL NOT because of discipline. But because of desire, excitement, passion to achieve stuff/title/status, passion to be the person I want to be, but I never really FORCED myself doing much, since I left school.
I truly believe, this way you live a much happier life. Maybe thats why I really value autonomy and my personal time so that I have buffer to rest when I dont want to do something, and push when I feel like it.
It might seem I am very disciplined grinder: system design, 800 problems solved on Leetcode, 8 years doing gym so-so consistently, deep-dives into how something works on the fundamental level just to be better engineer.
It was ALL NOT because of discipline. But because of desire, excitement, passion to achieve stuff/title/status, passion to be the person I want to be, but I never really FORCED myself doing much, since I left school.
I truly believe, this way you live a much happier life. Maybe thats why I really value autonomy and my personal time so that I have buffer to rest when I dont want to do something, and push when I feel like it.
❤9
andreyka26_se
Maybe not all of you know, but I do not support idea of discipline 😆😆 at least the way I understand it. It might seem I am very disciplined grinder: system design, 800 problems solved on Leetcode, 8 years doing gym so-so consistently, deep-dives into how…
Some beta/gamma weak energy. Ahahaha, but yeah, I never claimed I am strong person😆
Let’s see whether this can sustain long term, for now it is 8 years being working well for me.
Let’s see whether this can sustain long term, for now it is 8 years being working well for me.
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On Sat - I am gonna have first sparring since 2023. So probably I will get “розбита єбасосіна кабіна» a bit. But let’s see.
😁23
andreyka26_se
This was my last time😁😁
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It was that meme: “guys’ faces who only join sparring and never show up on regular training”, and they proved the point to me ahhahah
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Daily 412th day streak
I was not able to solve in reasonable time. The problem is amazing otherwise (except very poor explanation/definition). Definitely recommend. I will work later today on more solutions and understanding of them.
https://leetcode.com/problems/brace-expansion-ii/description/?envType=daily-question&envId=2026-09-26
#daily #hard #pattern
I was not able to solve in reasonable time. The problem is amazing otherwise (except very poor explanation/definition). Definitely recommend. I will work later today on more solutions and understanding of them.
https://leetcode.com/problems/brace-expansion-ii/description/?envType=daily-question&envId=2026-09-26
#daily #hard #pattern
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Daily 413th day streak
Pretty easy problem tbh. No specific pattern though, and sort of does not feel like bullshit, more or less applicable.
https://leetcode.com/problems/evaluate-the-bracket-pairs-of-a-string/description/?envType=daily-question&envId=2026-09-26
#daily #medium #nopattern
Pretty easy problem tbh. No specific pattern though, and sort of does not feel like bullshit, more or less applicable.
https://leetcode.com/problems/evaluate-the-bracket-pairs-of-a-string/description/?envType=daily-question&envId=2026-09-26
#daily #medium #nopattern
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Daily 414th day streak
Amazing problem, has very simple pattern, seen this one many many times -> definitely recommended. The problem itself is pretty easy
https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/description/?envType=daily-question&envId=2026-09-27
#daily #medium #pattern
Amazing problem, has very simple pattern, seen this one many many times -> definitely recommended. The problem itself is pretty easy
https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/description/?envType=daily-question&envId=2026-09-27
#daily #medium #pattern
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So I got interesting thing about my body.
Probably all of you are getting 1-2 times sick (cold) per year (at least this is how it was for me).
I noticed few years, that if I have some important events in life (like meeting somebody, interview, oncall, etc) - I subconsciously tell my body: "we cannot get sick now, later".
Then once important event is done, and I'm relaxed, same command: "now we can have sickness for a bit" and then it gets worse as usually sickness should go.
Do you have the same?
Probably all of you are getting 1-2 times sick (cold) per year (at least this is how it was for me).
I noticed few years, that if I have some important events in life (like meeting somebody, interview, oncall, etc) - I subconsciously tell my body: "we cannot get sick now, later".
AND IT WORKS!!! (most of the time).Then once important event is done, and I'm relaxed, same command: "now we can have sickness for a bit" and then it gets worse as usually sickness should go.
Do you have the same?
👍10❤3🤡1