Keindahan dan Legenda di Dalam Gua Jatijajar Kebumen

Sejarah Menarik Gua Jatijajar

Gua Jatijajar berada di Kebumen, Jawa Tengah. Lokasinya berada di wilayah perbukitan kapur yang sangat memukau. Selain itu, gua ini menawarkan kombinasi wisata alam dan kisah sejarah yang membuat banyak wisatawan tertarik.

Konon, masyarakat menemukan gua ini pada abad ke-19. Mereka menemukan gua saat sedang menggali tanah di area persawahan. Sejak itu, warga setempat mulai mengenali potensi wisata gua tersebut. Walau begitu, pemerintah kemudian mengembangkan kawasan ini lebih modern.

Nama Jatijajar memiliki arti unik. Kata “jati” berarti pohon jati dan “jajar” berarti berjajar rapi. Tempat ini dahulu dikelilingi pohon jati yang berdiri berderet. Oleh karena itu, nama tersebut melekat hingga sekarang.

Menariknya, gua ini juga menyimpan kisah legenda Raden Kamandaka atau Lutung Kasarung. Kisah ini menambah daya tarik budaya dan spiritual. Wisatawan dapat melihat beberapa diorama yang menggambarkan perjalanan tokoh tersebut. Dengan demikian, mereka bisa memahami cerita lokal sambil menikmati suasana alam khas pegunungan kapur.

Selain itu, pemerintah daerah terus menjaga kelestarian gua. Mereka melakukan berbagai perawatan. Jadi, area wisata tetap aman dan nyaman. Hingga kini, Gua Jatijajar menjadi salah satu ikon wisata unggulan Kebumen. Bahkan, banyak wisatawan Continue reading

KERIS TAMING SARI: SENJATA LEGENDA YANG SARAT NILAI SEJARAH

Asal Usul Keris Taming Sari

Legenda Keris Taming Sari selalu menarik perhatian banyak orang. Senjata ini terkenal sebagai keris sakti yang menyimpan kisah luar biasa. Menurut cerita rakyat, keris ini pertama kali muncul di Kerajaan Majapahit. Keris tersebut kemudian menjadi milik Hang Tuah, seorang pahlawan terkenal dari Kesultanan Malaka.

Para pandai besi hebat dipercaya menempa keris ini dengan teknik tingkat tinggi. Karena itu, Taming Sari dianggap unik. Selain itu, setiap detailnya menunjukkan karya seni kelas tinggi. Walaupun banyak legenda, para sejarawan tetap menilai benda ini sebagai simbol kejayaan masa lalu.

Selain sejarah Majapahit, hubungan dengan Malaka juga sangat kuat. Hang Tuah memakai keris ini dalam berbagai pertempuran. Oleh karena itu, sosok Hang Tuah selalu identik dengan Keris Taming Sari. Cerita tersebut terus bertahan dari generasi ke generasi.

Lebih jauh lagi, masyarakat percaya bahwa keris ini memiliki kekuatan mistis. Banyak dongeng menyebutkan keris mampu menang sendiri tanpa tuannya. Hal tersebut membuat banyak orang menganggapnya sebagai benda pusaka paling berpengaruh di Nusantara.

Ciri Khas Keris Taming Sari

Bila membahas keris legendaris ini, Continue reading

Burung yang Hanya Ada di Indonesia: Cucakrawa

Keindahan Burung Endemik dengan Suara Merdu

Burung Cucakrawa atau dikenal sebagai Cucak Rawa menjadi salah satu burung yang sangat istimewa di Indonesia. Selain itu, burung ini juga memiliki kicauan merdu yang memukau banyak pecinta burung. Karena itu, banyak orang merasa terpikat oleh pesonanya. Bahkan, mereka rela menghabiskan banyak uang untuk memilikinya. Namun, keberhasilan dalam melestarikan burung endemik ini tetap menjadi fokus penting.

Selain itu, Cucakrawa juga memperlihatkan warna tubuh yang menarik. Bulunya terlihat cokelat zaitun dengan kombinasi putih bersih di beberapa bagian. Kemudian, bentuk tubuhnya tampak gagah dan elegan. Karena itu, burung ini semakin populer. Hingga kini, keberadaannya tetap menjadi simbol kekayaan alam Indonesia.

Asal Usul dan Habitat Alami

Secara ilmiah, Cucakrawa memiliki nama Pycnonotus zeylanicus. Burung ini hanya hidup di Indonesia, terutama di wilayah Sumatra, Jawa, dan sebagian Kalimantan. Mereka hidup di rawa, hutan sekunder, serta daerah lembap. Oleh karena itu, mereka sangat bergantung pada lingkungan yang alami dan terjaga.

Selain itu, burung ini juga senang tinggal pada pepohonan tinggi. Mereka memilih tempat yang Continue reading

On MPLS Paths, Tunnels and Interfaces

One of my readers attempted to implement a multi-vendor multicast VPN over MPLS but failed. As a good network engineer, he tried various duct tapes but found that the only working one was a GRE tunnel within a VRF, resulting in considerable frustration. In his own words:

How is a GRE tunnel different compared to an MPLS LSP? I feel like conceptually, they kind of do the same thing. They just tunnel traffic by wrapping it with another header (one being IP/GRE, the other being MPLS).

Instead of going down the “how many angels are dancing on this pin” rabbit hole (also known as “Is MPLS tunneling?”), let’s focus on the fundamental differences between GRE/IPsec/VXLAN tunnels and MPLS paths.

Read more …

IP Addresses through 2025

It's 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.

How we mitigated a vulnerability in Cloudflare’s ACME validation logic

On October 13, 2025, security researchers from FearsOff identified and reported a vulnerability in Cloudflare's ACME (Automatic Certificate Management Environment) validation logic that disabled some of the WAF features on specific ACME-related paths. The vulnerability was reported and validated through Cloudflare’s bug bounty program.

The vulnerability was rooted in how our edge network processed requests destined for the ACME HTTP-01 challenge path (/.well-known/acme-challenge/*).

Here, we’ll briefly explain how this protocol works and the action we took to address the vulnerability. 

Cloudflare has patched this vulnerability and there is no action necessary for Cloudflare customers. We are not aware of any malicious actor abusing this vulnerability.

How ACME works to validate certificates

ACME is a protocol used to automate the issuance, renewal, and revocation of SSL/TLS certificates. When an HTTP-01 challenge is used to validate domain ownership, a Certificate Authority (CA) will expect to find a validation token at the HTTP path following the format of http://{customer domain}/.well-known/acme-challenge/{token value}. 

If this challenge is used by a certificate order managed by Cloudflare, then Cloudflare will respond on this path and provide the token provided by the CA to the caller. If the token provided does not Continue reading

How Moving Away from Ansible Made netlab Faster

TL&DR: Of course, the title is clickbait. While the differences are amazing, you won’t notice them in small topologies or when using bloatware that takes minutes to boot.

Let’s start with the background story: due to the (now fixed) suboptimal behavior of bleeding-edge Ansible releases, I decided to generate the device configuration files within netlab (previously, netlab prepared the device data, and the configuration files were rendered in an Ansible playbook).

As we use bash scripts to configure Linux containers, it makes little sense (once the bash scripts are created) to use an Ansible playbook to execute docker exec script or ip netns container exec script. netlab release 26.01 runs the bash scripts to configure Linux, Bird, and dnsmasq containers directly within the netlab initial process.

Now for the juicy part.

Read more …

RAID 5 with mixed-capacity disks on Linux

Standard RAID solutions waste space when disks have different sizes. Linux software RAID with LVM uses the full capacity of each disk and lets you grow storage by replacing one or two disks at a time.

We start with four disks of equal size:

$ lsblk -Mo NAME,TYPE,SIZE
NAME TYPE  SIZE
vda  disk  101M
vdb  disk  101M
vdc  disk  101M
vdd  disk  101M

We create one partition on each of them:

$ sgdisk --zap-all --new=0:0:0 -t 0:fd00 /dev/vda
$ sgdisk --zap-all --new=0:0:0 -t 0:fd00 /dev/vdb
$ sgdisk --zap-all --new=0:0:0 -t 0:fd00 /dev/vdc
$ sgdisk --zap-all --new=0:0:0 -t 0:fd00 /dev/vdd
$ lsblk -Mo NAME,TYPE,SIZE
NAME   TYPE  SIZE
vda    disk  101M
└─vda1 part  100M
vdb    disk  101M
└─vdb1 part  100M
vdc    disk  101M
└─vdc1 part  100M
vdd    disk  101M
└─vdd1 part  100M

We set up a RAID 5 device by assembling the four partitions:1

$ mdadm --create /dev/md0 --level=raid5 --bitmap=internal --raid-devices=4 \
>   /dev/vda1 /dev/vdb1 /dev/vdc1 /dev/vdd1
$ lsblk -Mo NAME,TYPE,SIZE
    NAME          TYPE    SIZE
    vda           disk    101M
┌┈▶ └─vda1        part    100M
┆   vdb           disk    101M
├┈▶ └─vdb1        part    100M
┆    Continue reading

TNO053: Ethernet Is Everywhere

Ethernet is everywhere. Today we talk with one of the people responsible for this protocol’s ubiquity. Doug Boom is a veteran of the Ethernet development world. His code has helped landers reach Mars, submarines sail the deep seas, airplanes get to their gates, cars drive around town, and more. Doug walks us through the origins... Read more »

Astro is joining Cloudflare

The Astro Technology Company, creators of the Astro web framework, is joining Cloudflare.

Astro is the web framework for building fast, content-driven websites. Over the past few years, we’ve seen an incredibly diverse range of developers and companies use Astro to build for the web. This ranges from established brands like Porsche and IKEA, to fast-growing AI companies like Opencode and OpenAI. Platforms that are built on Cloudflare, like Webflow Cloud and Wix Vibe, have chosen Astro to power the websites their customers build and deploy to their own platforms. At Cloudflare, we use Astro, too — for our developer docs, website, landing pages, and more. Astro is used almost everywhere there is content on the Internet.

By joining forces with the Astro team, we are doubling down on making Astro the best framework for content-driven websites for many years to come. The best version of Astro — Astro 6 —  is just around the corner, bringing a redesigned development server powered by Vite. The first public beta release of Astro 6 is now available, with GA coming in the weeks ahead.

We are excited to share this news and even more thrilled for what Continue reading

Kubernetes Networking at Scale: From Tool Sprawl to a Unified Solution

As Kubernetes platforms scale, one part of the system consistently resists standardization and predictability: networking. While compute and storage have largely matured into predictable, operationally stable subsystems, networking remains a primary source of complexity and operational risk

This complexity is not the result of missing features or immature technology. Instead, it stems from how Kubernetes networking capabilities have evolved as a collection of independently delivered components rather than as a cohesive system. As organizations continue to scale Kubernetes across hybrid and multi-environment deployments, this fragmentation increasingly limits agility, reliability, and security.

This post explores how Kubernetes networking arrived at this point, why hybrid environments amplify its operational challenges, and why the industry is moving toward more integrated solutions that bring connectivity, security, and observability into a single operational experience.

Ready to Scale Kubernetes Without the Stress?
Scaling Kubernetes Networking Without the Complexity

The Components of Kubernetes Networking

Kubernetes networking was designed to be flexible and extensible. Rather than prescribing a single implementation, Kubernetes defined a set of primitives and left key responsibilities such as pod connectivity, IP allocation, and policy enforcement to the ecosystem. Over time, these responsibilities were addressed by a growing set of specialized components, each focused on a narrow slice of Continue reading

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