Optimizing BGP convergence
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Managing Application Dependencies in Containerized Environments
By carefully identifying and managing the dependencies between different services within an application, it is possible to ensure that the application functions properly and can be easily maintained and updated over time.Optimizing BGP convergence
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netlab: Building a Layer-2 Fabric
A friend of mine decided to use netlab to build a simple traditional data center fabric, and asked me a question along these lines:
How do I make all the ports be L2 by default i.e. not have IP address assigned to them?
Trying to answer his question way too late in the evening (I know, I shouldn’t be doing that), I focused on the “no IP addresses” part. To get there, you have to use the l2only pool or disable IPv4 prefixes in the built-in address pools, for example:
phpIPAM installation on CentOS 7 with php8 and nginx webserver
How to install phpipam on CentOS 7 linux with php8 support on nginx.Worth Reading: Do We Need Network Automation
A long, long time ago, Mircea Ulinic (the author of Salt networking modules) wrote a long and thoughtful blog post on whether we need network automation (TL&DR spoiler: yes).
After reading the article, you might want to listen to the Salt and SaltStack podcast we did with Mircea a long while ago, and watch his presentation in Building Network Automation Solutions online course (also accessible with Expert Subscription).
IP Addresses through 2022
Time for another annual roundup from the world of IP addresses. Let's see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself.IP Addresses through 2022
Time for another annual roundup from the world of IP addresses. Let's see what has changed in the past 12 months in addressing the Internet and look at how IP address allocation information can inform us of the changing nature of the network itself.Worth Exploring: OMNI and AERO
Do you ever feel like we don’t have enough overlay networking technologies? Don’t worry, there’s always another one, for example Overlay Multilink Network Interface (OMNI) with Asymmetric Extended Route Optimization (AERO) services. Want to know more? Fred Templin described it in a series of overview articles on APNIC blog.
Buffer overflow — Linux Process — Stack Creation and Inspection
< MEDIUM: https://raaki-88.medium.com/buffer-overflow-linux-process-stack-creation-and-i-d6f28b0239dc >
Process and what happens during process creation have been discussed in this post previously — https://medium.com/@raaki-88/linux-process-what-happens-under-the-hood-49e8bcf6173c
Now, let’s understand what is buffer overflow:
A buffer overflow is a type of software vulnerability that occurs when a program tries to store more data in a buffer (a temporary storage area) than it can hold. This can cause the program to overwrite adjacent memory locations, potentially leading to the execution of malicious code or the crashing of the program. Buffer overflow attacks are a common method used by hackers to gain unauthorized access to a system.
Generally, C and C++ languages are more vulnerable to Buffer Overflow while programming languages like Python and Go have implementations which protect stack.
I have written the program in Python but had to use underlying C functionality to achieve similarly.
#!/usr/bin/python3
import ctypes
import pdb
buffer = ctypes.create_string_buffer(8)
ctypes.memmove(buffer, b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",1000)
print('end of the program')
This is a very simple implementation where we created a buffer which can hold 8 bytes of memory, next we will create a new object which moves from one block of the memory to another but with a newer size, which will Continue reading
Friday Networking Field Day Thoughts
I’m wrapping up Networking Field Day 30 this week and as is always the case there was a lot of great discussion from both the presenters and the delegates outside of the presentations. It’s one of the reasons why I love doing this job even after almost ten years. I get to meet fun people and have an impact on so many things in the tech industry.
- Network-as-a-Service is coming. We recorded a roundtable discussion about it and I think the impact that it’s going to have on mid-sized businesses is massive. It’s going to be like cloud. Not just in operational capability. It’s also going to be a huge driver for what you can do with your network in support of applications. The snowflakes may melt under the weight of the cookies we make from the cookie cutter deployments.
- It feels like a lot of companies are trying to find what’s next. Part of that is coming from the ways that organizations are changing their outlook for what an office should be after the pandemic shutdowns. But still others are realizing they can’t use the same revenue stream for the next five years and hope to survive. This isn’t Continue reading
Heavy Networking 662: Home Lab In The Cloud Or Your Basement?
On today's Heavy Networking, guest Tom Costello walks us through his personal lab in the cloud. We discuss pros and cons of the cloud vs. a basement, using EVE-NG vs. CML, how automation can help you manage cloud costs, resources for those who might want a cloud lab, and more.
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