Network Engineering

JANUARY 25, 2025

Could I use two instances of netcat a server and a client with the IPv6 ff02::1 multicast address? Either would be fine; I just want to experiment and see how can I use a multicast address to send/receive either tcp or udp packets. I'm not even sure what I can do liste to multicast? Only send data to multicast?

TCP 52

TCP Server 52

Heroku

NOVEMBER 21, 2024

beta, our engineering team has addressed several bugs, all fairly straight-forward with one exception involving Puma -based applications. After thorough router investigation and peeling back Pumas server code, we realized what we had stumbled upon was not actually a Router 2.0 ec2:11059 tcp 0 0 ip-10-1-87-57.ec2:28631

Routers 59

Routers TCP Server DNS 59

Kentik

FEBRUARY 27, 2023

The need for speed The Kentik Data Explorer is Kentik’s interface between you as an engineer, whether that’s network, systems, cloud, security, or SRE, and the database of information you’ve collected with the Kentik platform. But the real key here is that the Kentik Data Explorer was purpose-built for querying a massive database.

Network 98

Network Networking TCP IP Address 98

Network Engineering

JANUARY 23, 2025

After the connection is disrupted, when I attempt to send a packet from the server using the previously established socket, the router responds with a RST (reset) packet. I have a router that uses a SIM card for connectivity, and I create a socket connection. However, this SIM card often experiences connectivity issues.

Routers 52

Routers TCP Firewall Server 52

Network Engineering

JANUARY 15, 2025

I have a TCP server running on my Ubuntu gateway computer at 10.0.0.1:8080. 8080 [link] , I see the correct traffic returning and logs showing from my server on 8080. My Wi-Fi is connected to the gateway's LAN (enp4s0) port, and my modem is in bridge mode and plugged into enp3s0.

LAN 52

LAN Gateway TCP Port 52

CloudFaire

DECEMBER 30, 2024

Internet protocol specifications are instructions designed for engineers to build things. Any reasonably skilled engineer should be able to take a specification and produce a performant, reliable, and secure implementation. Server receives the request HEADERS frame and validates it against RFC 9114 rules.

Protocol 101

Protocol Server Internet TCP 101

Kentik

JANUARY 13, 2021

Despite your best efforts as a network engineer, network failures happen, and you have to fix them. No network engineer can troubleshoot without being prepared with their tools and telemetry. Send these pings using the Internet Control Message Protocol (ICMP) or TCP to one or any of the devices you believe to be involved.

Network 114

Network Networking TCP Protocol 114

Slack Engineering

OCTOBER 10, 2024

This is the story of a tricky bug we encountered last July and the lessons we learned along the way about being careful with TCP state. Our code suggested that the closed state is only a function of the writer, which is controlled by the application server, not the reader.

Server 76

Server TCP Application Engineering 76

CATO Networks

JUNE 14, 2023

In most cases, these patterns are evaluated on a single network packet, rather than a sequence of flows between a client host and a server. MAC address in the data link layer of a packet capture Moving up the stack, at the network and transport layers, is a much more granular source of information, the TCP/IP stack.

IoT 52

IoT TCP Protocol Server 52

Kentik

MARCH 31, 2020

engineering fellow and vice president at Google. One of the key elements of Espresso is the software-defined peering driven by measuring every TCP connection but done at each server. The first day of NANOG kicked off with a keynote from Amin Vahdat, Ph.D. Google can build a sampled aggregate of the performance.

WAN 88

WAN Network Networking TCP 88

Kentik

SEPTEMBER 20, 2016

It’s up to IT and network engineering groups to address performance, but to do so they need effective ways to measure and monitor. For example, using SNMP or flow data to track traffic volume on interfaces, servers, and devices can provide necessary visibility into possible congestion points. TCP is the key.

Network 40

Network Networking TCP Server 40

Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f Higher level abstractions For another level of abstraction, open source tools have emerged, such as Cilium , which runs as an agent in container pods or on servers. tcpdrop allows you to trace TCP packet drops.

TCP 110

TCP Application Virtual machine Network 110

CATO Networks

DECEMBER 24, 2019

A recent conversation with a WAN engineer got me thinking about how network optimization techniques have changed over the years. Additionally, Catos cloud-native network stack leverages network optimization techniques and tools like TCP proxies and advanced congestion management algorithms to improve WAN throughput.

WAN 52

WAN Network Networking TCP 52

Network Engineering

DECEMBER 16, 2015

nat (inside,dmz) static 123.123.27.134 service tcp ssh ssh access-list OUTSIDE extended permit tcp any host 123.123.27.134 eq ssh However, when I do that, and try to telnet to port 22 on 123.123.27.134 I end up on a server that does not even belong to us and SSH version that I do not expect. Stripped for readability.

IP Address 52

IP Address Port TCP Server 52

Kentik

DECEMBER 18, 2019

Last month at DENOG11 in Germany, Kentik Site Reliability Engineer Costas Drogos talked about the SRE team’s journey during the last four years of growing Kentik’s infrastructure to support thousands of BGP sessions with customer devices on Kentik’s multi-tenant SaaS (cloud) platform.

Server 13

Server Topology TCP Network 13

Kentik

OCTOBER 12, 2021

Once you saw a person’s password to any given application, you knew they were generally using the same one for all of their other applications — email, the ticketing system, the FTP and Novell servers, etc. The Internet Engineering Task Force (IETF) is also working toward changes that will impact pervasive monitoring.

Encryption 84

Encryption DNS IP Address Protocol 84

CATO Networks

JUNE 1, 2020

For example, videoconferences between engineers and product managers on separate contents can be brought to a standstill because of packet loss or latency. Proxy TCP Connections Fundamentally, TCP (Transmission Control Protocol) connections inherently add more overhead than their UDP (User Datagram Protocol) counterparts.

Network 52

Network Networking TCP MPLS 52

Network Engineering

JULY 3, 2021

inside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 telnet timeout 5 ssh timeout 5 console timeout 0 dhcpd auto_config outside !

VPN 52

VPN IP Address Encryption TCP 52

CATO Networks

AUGUST 18, 2022

Because of this convergence, automated security engines and customized policies benefit from shared context and visibility allowing true single-pass processing and more accurate security verdicts. Included features like QoS, TCP Acceleration, and Packet Loss Mitigation allow customers to fine-tune performance to their needs.

SASE 52

SASE Cloud Port Firewall 52

Kentik

DECEMBER 5, 2016

In a recent blog post by Kentik Solutions Engineer Eric Graham we explained how we “dog food” our own NPM solution to troubleshoot network performance issues within our own cloud-based application. Next we set Metric (still in the Query pane) to look at the percentage of TCP retransmits. Is It One of Our Servers?

Network 40

Network Networking TCP IP Address 40

CATO Networks

MARCH 24, 2020

At the beginning of the month, Microsoft released an advisory and security patch for a serious Windows Server Message Block (SMB) vulnerability called the Windows SMBv3 Client/Server Remote Code Execution Vulnerability (AKA Windows SMBv3 RCE or CVE-2020-0796). This would solve the problem for SMB servers but not SMB clients.

SMB 52

SMB Port Server Protocol 52

CATO Networks

SEPTEMBER 11, 2023

allow users on the corporate VLAN to access printers located in the printer VLAN, over specific TCP ports. CCTV cameras), connected to an IOT-camera VLAN, to access the IOT File Server, but only over HTTPS. A LAN Firewall policy, implemented in the Cato Socket, allows the camera to access an internal CCTV server.

LAN 52

LAN Cloud Firewall WAN 52

Kentik

DECEMBER 2, 2015

The issue was a new type of “spam reflection” that was causing headaches by allowing spammers to avoid detection while utilizing servers inside the customer’s network as spam sources. Here’s how these types of schemes work: The spammer sends a SYN from a spoofed source IP address to TCP port 25 (SMTP) on the target mail server.

TCP 40

TCP Protocol Port IP Address 40

CATO Networks

FEBRUARY 26, 2020

Today, enterprises must be prepared to address a wide variety of attacks including social engineering attacks, Internet-borne malware, and ransomware across all the different attack vectors that exist within modern networks. Additionally, a Deep Packet Inspection (DPI) engine enables contextualization of traffic.

Network Security 52

Network Security Network Networking UDP port 52

Kentik

JUNE 14, 2023

An engineer standing in front of a console today stares at the traffic moving from their on-prem data center up and out to a CASB, receiving DNS responses from a cloud-provided DNS service, and then on through an ephemeral microservices architecture in a public cloud. But the universe isn’t two-dimensional, is it?

WAN 59

WAN Data Centers DNS Internet 59

Confluent

MARCH 28, 2019

In a nutshell, Redux maintains a large JSON object and forces engineers who want to mutate data within it into a specific contract to do so. WebSockets communicate using TCP once connected and, since the UI controls the poll interval, this method gives the greatest flexibility possible for streaming events. Too much overhead.

JavaScript 79

JavaScript Engineering Application TCP 79

Kentik

MAY 31, 2017

At Kentik, we firmly believe that network engineering, operations, and planning are critically dependent not only on the quality of traffic data but also the accessibility of that data. With true cross-tool integration being extremely rare in legacy tools, engineers have to do the “integration” work themselves via swivel-chair operations.

Network 40

Network Networking Engineering TCP 40

Confluent

MARCH 28, 2019

In a nutshell, Redux maintains a large JSON object and forces engineers who want to mutate data within it into a specific contract to do so. WebSockets communicate using TCP once connected and, since the UI controls the poll interval, this method gives the greatest flexibility possible for streaming events. Too much overhead.

JavaScript 74

JavaScript Engineering Application TCP 74

Confluent

OCTOBER 10, 2019

MQTT: This is built on top of TCP/IP for constrained devices and unreliable networks, applying to many (open source) broker implementations and many client libraries. In the same way, industrial protocols are a book with seven seals for software engineers. Supports many client connections (tens of thousands per MQTT server).

IoT 20

IoT Internet Protocol Cloud 20

Kentik

OCTOBER 2, 2015

It focuses on using PHP to parse the JSON and to write the desired values to a human-readable file on a web server. Kentik Detect customers use alerts to monitor various metrics in the data that is ingested into the Kentik Data Engine (KDE), including information on devices, interfaces, IP/CIDR, Geo, ASN, and ports. Step by Step.

Port 40

Port Protocol Server Bandwidth 40

Kentik

JUNE 6, 2023

To expose Docker’s API to the world , use: sudo dockerd -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 2375 Connect to your server at its IP address over port 2375. You can add your Linux server as a data source here or whatever other data sources you want to pipe in. Sign up with Kentik and log in. Throughput.

IP Address 52

IP Address Server TCP Port 52

Kentik

JULY 28, 2021

It isn’t so much that packet loss is a huge problem — TCP and QUIC were engineered in anticipation that lost packets would be inevitable. Latency : Missing packets in connection-oriented protocols such as TCP and QUIC result in lost packets getting resent. UDP vs. TCP. Packet Loss Causes Problems with Cloud Applications.

Cloud 116

Cloud TCP Routers Protocol 116

CloudFaire

DECEMBER 9, 2024

Google is far and away the most popular search engine globally, across all platforms. of TCP connections are unexpectedly terminated before any useful data can be exchanged. Most popular API client languages in 2024 Google is the most popular search engine globally, across all platforms. Security 6.5%

Internet 72

Internet Email IP Address TCP 72