Packet Pushers

APRIL 21, 2023

In this episode, Ed, Scott, and Tom discusshow hosts OSes such as Windows, Apple, and Android automatically obtain both IPv6 addressesand DNS server information. In this episode, Ed, Scott, and Tom discusshow hosts OSes such as Windows, Apple, and Android automatically obtain both IPv6 addressesand DNS server information.

DNS 52

DNS Server 52

InfoQ Articles

OCTOBER 11, 2024

Netflix's EVCache system handles 400M ops/second across 22,000 servers, managing 14.3 By implementing batch compression and switching to DNS-based discovery, Netflix optimizes efficiency, reduces bandwidth usage and significantly lowers operational costs. PB of data.

DNS 97

DNS Bandwidth Server Cloud 97

ByteByteGo

JANUARY 25, 2025

10 Essential Components of a Production Web Application It all starts with CI/CD pipelines that deploy code to the server instances. After DNS resolution, the requests reach the app servers. Load balancers and reverse proxies (such as Nginx & HAProxy) distribute user requests evenly across the web application servers.

Cookie 173

Cookie Gateway Server Application 173

Kentik

AUGUST 21, 2017

Dashboards for DNS Metrics Reveal Issues With Your Infrastructure. Working behind the scenes, Domain Name Server (DNS) is often overlooked, but it’s one of the most critical pieces of the Internet infrastructure. That point was driven home by the Mirai DDoS attack last October against the DNS infrastructure of Dyn, Inc.

DNS 40

DNS Server IP Address Ethernet 40

Kentik

SEPTEMBER 22, 2021

In an effort to regularize the deployment of software patches and updates to their software, Microsoft, years ago, designated this the day of the month to be when patches get pushed out globally to computers, servers, and other devices running Microsoft’s operating systems. OTT Service Tracking.

DNS 145

DNS Port Routers Networking 145

Kentik

OCTOBER 4, 2021

Included in the withdrawn prefixes were the IP addresses of Facebook’s authoritative DNS servers, rendering them unreachable. For example, in IPv4, Facebook authoritative server a.ns.facebook.com resolves to the address 129.134.30.12 which is routed as 129.134.30.0/24 24 and 129.134.30.0/23.

TCP 145

TCP DNS Server Media 145

Kentik

JANUARY 24, 2022

If you are thinking that those represent HTTP and HTTPS, you would be largely correct, but that doesn’t mean it’s traffic involving web servers. Lots of applications use these ports today, including DNS lookups and email. NetFlow application monitoring: Use DNS logs. How did this happen? NetFlow with NBAR. So, what do you do?

Application 96

Application IP Address DNS Port 96

AWS Architecture

NOVEMBER 11, 2024

It is specifically focused on managing DNS routing and traffic management during failover and recovery operation; however, some customers decide to implement their own strategies for application recovery. Next, start or scale out application servers that run on EC2 instances or containers.

Insurance 122

Insurance Application DNS Server 122

Kentik

JANUARY 10, 2022

To be more specific: slowness can be introduced as your digital connection traverses your PC, the local wifi/wired connection, the local ISP, the Tier 1 or Tier 2 provider, or the CDN that provides the hardware which hosts the web server running the application. Where is the DNS? The HTML, the CSS, etc. all have to be downloaded.

IP Address 98

IP Address DNS TCP Application 98

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. Getting all the DNS logs is often impractical. Is Google hijacking DNS with DoH? Well, that didn’t last long.

Encryption 84

Encryption DNS IP Address Protocol 84

Kentik

DECEMBER 13, 2021

To properly monitor them, it’s paramount to find out which servers your end users are connecting to. This is sort of a long shot, but are you using a corporate DNS server? You might try temporarily switching to a public DNS like Google’s 8.8.8.8. DNS lookups can introduce significant latency on new connections.

Application 95

Application DNS Routers Server 95

ByteByteGo

DECEMBER 7, 2024

Create High-Level Design Break down the system into components such as client apps, servers, load balancers, databases, etc. Used in DNS querying and CDNs. Focus on attributes like the number of users, traffic, storage/memory needs, and compute and networking requirements. Focus on the data flow. How Does VISA Make Money?

Unicast 211

Unicast Banking Protocol Networking 211

Packet Pushers

JUNE 13, 2024

If you dont blame destination unreachable messages on DNS servers, are you even a real network engineer? Read more » If you dont blame destination unreachable messages on DNS servers, are you even a real network engineer? He walks us through identifying possible. He walks us through identifying possible.

DNS 52

DNS Networking Network Server 52

Kentik

JANUARY 28, 2021

While synthetics can be triggered or collected via device telemetry interfaces, they are actually a broader category spanning client and server endpoints, network elements, and internet-wide locations performing network and application-layer testing. What are my frequently queried domain names and talkative DNS clients?

Networking 72

Networking Network DNS IP Address 72

Network Engineering

AUGUST 19, 2020

WAN > OPNsense (in ESXi)> switch (C3560G) OPNsense is DHCP server Thing is that i would like the switch to deal with the DHCP, to avoid being naked when ESXi needs maintenance. Also need to setup a VPN on OPNsense but will that be possible if 3560 is acting as the DHCP server? dns-server 10.0.0.2 255.255.255.0

IP Address 52

IP Address DNS Routers Server 52

ByteByteGo

NOVEMBER 23, 2024

The source could be any video and audio source wired up to an encoder Step 2: To provide the best upload condition for the streamer, most live streaming platforms provide point-of-presence servers worldwide. The streamer connects to a point-of-presence server closest to them.

IP Address 100

IP Address Routers Internet Server 100

Confluent

OCTOBER 7, 2019

Especially note the exposing external endpoints and proper DNS setup explained in part 1. External endpoint exposure with public DNS is required for this tutorial. Here’s a screenshot of my DNS setup for the domain name used in part 1. Running and accessible Confluent Schema Registry , which was mentioned in part 1, in PKS.

Application 18

Application DNS PaaS Server 18

Kentik

MAY 24, 2023

This switch happens and is decided on the server side, not the client. The end user to embedded server cluster mapping Failure scenarios and how to secure that the event can run smoothly in the case of failures in the network. In the recent blog posts, we detailed the most common ways CDNs map end users to the correct cache location.

IP Address 98

IP Address Internet DNS Server 98

Kentik

MAY 2, 2018

During last week’s attack, the attacker was redirecting traffic that belonged to Amazon’s Route 53 DNS servers. Below is a diagram of how this attack worked: Once the attackers have the DNS requests coming to them, they can respond with the IP address of a server they control.

IP Address 49

IP Address DNS UDP port Advertising 49

Kentik

MARCH 20, 2019

Application and server performance in the cloud. DDI management (DNS, DHCP, and IP addressing), network monitoring configuration, and routing are also very frequently automated. Network performance between cloud workloads. The above data shows, “Network teams excel at applying automation to network security controls in the cloud.

Engineering 102

Engineering Cloud Networking Network 102

Network Engineering

OCTOBER 7, 2015

We have a Cisco 3825 router with an IPSec Remote Access VPN configured to authenticate against a radius server. We're retiring the old server and moving to a new one (Windows Server 2012). We changed the radius-server host line in our config accordingly and the router is able to communicate with the new radius server.

VPN 52

VPN Port Routers Server 52

Kentik

APRIL 19, 2023

Sometimes there is a perception that the embedded solution is about saving money for space and power needed to host the servers, but this is mostly a misunderstanding. The business case can directly compare the saved cost and the estimated cost of space and power for the embedded servers. Let’s have a look at the third case.

IP Address 52

IP Address DNS Server Networking 52

Kentik

JUNE 4, 2019

OTT tagging: Because commercial CDNs deliver traffic for multiple content providers, OTT services can’t be identified based on the server IP in a flow record. Are my subscribers getting content from the nearest possible servers? The destination IP in flow data is matched to the IP from which the DNS query originated.

DNS 56

DNS Server Internet Networking 56

Kentik

AUGUST 3, 2021

For example, some DevOps teams feel that AWS is more ideal for infrastructure services such as DNS services and load balancing. This is because much like an on-premises network, each cloud is a restricted network full of routers, switches and servers that can stretch the entire globe.

Cloud 124

Cloud Networking Network Gateway 124

Akins IT

OCTOBER 28, 2019

When using Azure as a DR play or extension of your existing on-prem server infrastructure (Cloud Hybridization), Domain Controllers and DNS servers should be your first set of VMs. These can be deployed within segmented VNET subnets to provide proper network segmentation, much like VLANs in an on-prem environment.

DNS 52

DNS Server Firewall Networking 52

Akins IT

OCTOBER 17, 2018

On-net / Off-net Filtering Content filtering persists even while the devices are off-net, and new or updated EMS profiles can be pushed out to these devices so long as they can communicate with the EMS server. For off-net devices, this is achieved by having a public DNS entry exactly as the servers FQDN.

IP Address 52

IP Address Server DNS 52

Heroku

NOVEMBER 21, 2024

After thorough router investigation and peeling back Pumas server code, we realized what we had stumbled upon was not actually a Router 2.0 Reproduction The long response times issue first surfaced through a customer support ticket for an application running a Puma + Rails web server. performance issue. ec2:11059 tcp 0 0 ip-10-1-87-57.ec2:28631

Routers 59

Routers TCP Server DNS 59

Network Engineering

JANUARY 4, 2025

[I'm unsure whether this should be posted on Network Engineering, Server Faults or Android Enthusiasts] We have a hotspot service that connects into MikroTik routers, using the built-in hotspot facility. From a networking point of view, DNS is functional and there are no firewall entries that can restrict the traffic.

Firewall 52

Firewall DNS Gateway Routers 52

Kentik

MARCH 7, 2023

Often this is the first tier of “enriching the data,” where correlations between network details like IP addresses, DNS names, application stack tags, and deployment versions can be made. These ETL/ELT servers can provide a standard method of synthesis, which can be replicated across as many servers as it takes to ingest all of the data.

Networking 99

Networking Network Cloud Engineering 99

Kentik

APRIL 5, 2023

Movie Open Connect is unique among the CDNs since they do not rely on the DNS system to direct the end user to the suitable cache. The typical DNS-based flow for a content server by a CDN looks like this: 1. Site.com But how is mapping the DNS server to the cache or cache locations done? Where is site.com ?

Networking 52

Networking Network DNS IP Address 52

The Network DNA

NOVEMBER 26, 2024

10.10.10.100 inside NDNA-ASA(config)# dhcpd dns 112.110.112.5 10.10.10.100 inside NDNA-ASA(config)# dhcpd dns 112.110.112.5 Configure an ACL to allow access to the DMZ server from the Internet NDNA-ASA(config)# access-list OUTSIDE-DMZ permit ip any host 10.10.2.3 NDNA-ASA(config)# dhcpd option 3 ip 10.10.10.1 255.255.255.0

Firewall 52

Firewall IP Address VPN Port 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 17, 2021

CDN Content Delivery Network (CDN) is a geographically distributed network of servers that serve cached copies of web content. CDNs improve a websites performance by moving the service closer to end users and decreasing the load on the origin server. DNS The Domain Name Service (DNS ) is the address book of the Internet.

Networking 52

Networking Network NaaS SASE 52

Kentik

MARCH 13, 2023

How it used to be When I started my career in networking, servers were down the hall or in the campus data center. Today, engineers are dealing with an SD-WAN controller , a centralized CASB interface, and cloud-based network services like DNS and user authentication. The WAN was how we got access to some websites and sent emails.

WAN 98

WAN Wide Area Network Topology Internet 98

Kentik

DECEMBER 18, 2019

These include SNMP, DNS, RADIUS and streaming telemetry. we never initiate connections to the customers) on servers running Debian GNU/Linux. The load balancer node rewrites the source MAC of the packet and forwards the packet to the real server that’s running the BGP code. BGP routing data is another important data source.

Server 13

Server Topology TCP Networking 13

Kentik

FEBRUARY 28, 2018

In this way, it’s very much like DNS and NTP services that have been abused this way in the past. The memcached server then generates a flood of reply traffic toward the spoofed victim IP. The memcached server then generates a flood of reply traffic toward the spoofed victim IP. That makes for massive attack potential.

DNS 40

DNS Server Bandwidth Application 40

NW Kings

DECEMBER 10, 2024

A TCP port is a unique number assigned to specific services and applications that run on a server. It serves as an endpoint for communication between a client and the server, allowing different communication processes over a network. This combination directs network traffic to the appropriate service or application running on a server.

UDP port 40

UDP port Port TCP IP Address 40