Kentik

OCTOBER 4, 2021

According to a statement published last night, Facebook Engineering wrote, “Configuration changes on the backbone routers that coordinate network traffic between our data centers caused issues that interrupted this communication.” For example, in IPv4, Facebook authoritative server a.ns.facebook.com resolves to the address 129.134.30.12

TCP 145

TCP DNS Server Media 145

CloudFaire

JANUARY 3, 2025

As a result, Internet devices usually use a single path and let the routers handle the path selection. Typically, Linux is used on the server side, and iOS/macOS as the client. Linux as a server Conceptually, the MPTCP design is pretty sensible. Typically, the server allows the client to reuse the server IP/port address.

TCP 137

TCP Port Server Advertising 137

Router-switch

OCTOBER 23, 2024

ProLiant servers owned by HPE recently set 48 world records in this field, demonstrating its outstanding innovation capabilities in server technology.

Server 40

Server Energy Routers Network 40

Kentik

DECEMBER 10, 2020

The private peering was shared across two routers per side. As we were troubleshooting with our cloud service provider technical team, the cloud service provider identified that there was a single router failure in the CSP, which affected all traffic routing towards our SaaS provider for DNS.

DNS 105

DNS Cloud Routers Data Centers 105

Kentik

JANUARY 6, 2021

Traditional WAN : WAN access switches, integrated services routers, cloud access routers. Service provider backbone : Edge and core routers, transport switches, optical switches, DC interconnects. Endpoints : Both eyeball and server/service endpoints, including physical, virtual, and overlay/tunnel interfaces.

Networking 128

Networking Network Gateway Access Point 128

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. share one router with a single public IP address.

IP Address 100

IP Address Routers Internet Server 100

Router-switch

OCTOBER 14, 2024

This article explains WPA3, its benefits, and the reasons that upgrading to a Cisco router that supports WPA3 might significantly increase network security.

Routers 40

Routers Network Security Networking Wireless 40

Kentik

NOVEMBER 7, 2021

The mail server, the CRM, the file servers, etc. If we had a connection problem, we’d call over the cubical something like, “Hey Darla, can you see the Skywalker server? The NetOps team can’t Telnet to routers and look at routing tables, and they can’t change routes or span a port to collect packets.

Routers 104

Routers Internet Application Server 104

Kentik

SEPTEMBER 20, 2021

Not as difficult as time travel, but it’s difficult enough so that for 30+ years IT professionals have tried to skirt the issue by adding more bandwidth between locations or by rolling out faster routers and switches. Each switch and router we pass through introduces a bit of latency that adds up quickly. How latency is measured.

TCP 116

TCP Routers Bandwidth IP Address 116

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. How does OTT Service Tracking help?

DNS 145

DNS Port Routers Networking 145

ByteByteGo

DECEMBER 17, 2024

The load balancer ensures that incoming requests are evenly distributed across servers to avoid overloading any single server. Service Endpoint & Authorization : Once the data reaches the server, it is passed to a service endpoint where the system performs authentication. This data is routed through a load balancer.

Routers 130

Routers Engineering Server Virtual machine 130

4sysops

JANUARY 21, 2025

Million Hosts, Including VPNs and Routers Recent research has identified significant security vulnerabilities in various tunneling protocols, which could be exploited by attackers to conduct a host of malicious activities. million systems, including VPN servers and routers, are… Read more Approximately 4.2

Protocol 52

Protocol Routers VPN Server 52

Network Engineering

JANUARY 14, 2025

If I assign a static IP on the device level that is within the DHCP range of the network it's on, but don't reserve its address on the DHCP server, will the device lose its IP address or be disconnected if the router restarts?

IP Address 52

IP Address Routers Server Networking 52

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? Notice above that the routers used in the connection are looking pretty snappy. Make sure that both devices are using the same server.

Application 95

Application DNS Routers Server 95

Network Engineering

JANUARY 31, 2025

After a juniper router upgrade we started having MTU problems. I'm no longer able to send the router a 1500 byte ICMP packet (on a direct attached subnet with vlan) and get a reply. If I adjust the MTU in my linux server to 1504, I do get a reply but with an extra 4 bytes.

52

52

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

JANUARY 24, 2022

Back in the 1990s, NetFlow was introduced on Cisco routers as a means to collect information about IP network traffic as it enters or exits an interface. 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. How did this happen?

Application 96

Application IP Address DNS Port 96

Network Engineering

JANUARY 1, 2025

Objectives Install FreeRADIUS on CentOS(steam 9) to perform Cisco device authentication Perform dot1x authentication on all ports of the switch Perform authentication by connecting a laptop to the switch CentOS(203.230.7.2) - Cisco 2960 Switch(203.230.7.254) - Cisco 2800 Series Router(gig0/0 : 203.230.7.1, 255.255.255.0 255.255.255.0

Port 52

Port Routers Firewall Server 52

Network Engineering

AUGUST 19, 2020

The problem is that when ESXi is down it takes down all the network with it, so I have to boot up another router to log in to it. 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. default-router 10.0.0.1

IP Address 52

IP Address DNS Routers Server 52

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. As a result, this event introduces additional slowness.

IP Address 98

IP Address DNS TCP Application 98

CATO Networks

APRIL 25, 2017

When users are in VLAN 1, for example, they can readily access the servers in VLAN 1. Layer-3 Service Insertion With L3 service insertion, network services in the datacenter are inserted at the router. Users in Subnet #1 send traffic to their router that does an L3 lookup and forwards packets to the servers in Subnet #2.

WAN 52

WAN Routers Firewall Wide Area Network 52

Kentik

SEPTEMBER 19, 2018

In a nutshell, UE enriches all the flow data Kentik receives with tags that indicate the PoP, router, interface, etc. Each network device (switch, router) in this network is sending data to Kentik (flow, BGP, and SNMP data). Based upon the flow generated from the border router, we can see that this flow is originating from 1.1.1.1

Networking 49

Networking Network Routers Server 49

DoorDash Engineering

NOVEMBER 29, 2022

As discussed in the previous section, our forward-looking payment processing vendors deployed their servers in on-premise data centers, instead of the cloud, to ensure that they have total control over data storage and transfer. Vendor’s data centers have private links to their own routers which are set up in AWS Direct Connect Locations.

Data Centers 97

Data Centers Cloud Gateway IP Address 97

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. We still need to connect our infrastructure to the public internet, so the enterprise WAN is still about routers, circuit IDs, and perimeter firewalls. The WAN was how we got access to some websites and sent emails.

WAN 98

WAN Wide Area Network Topology Internet 98

Kentik

FEBRUARY 8, 2023

Port mirroring Another method for gathering traffic telemetry is port mirroring, which replicates (mirrors) the network traffic on a switch or router to a monitoring device. Software probes Software probes are programs that can be installed on servers or network devices to collect data on network traffic.

Networking 111

Networking Network Port IP Address 111

Kentik

AUGUST 3, 2021

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. At the same time, the move to cloud has impaired the ability of legacy traffic monitoring tools to troubleshoot latency problems between systems.

Cloud 124

Cloud Networking Network Gateway 124

Kentik

OCTOBER 14, 2021

Gradually moving up from T1 to T2 to T3 support lines, she eventually learned enough to move server-side. Having the ability to set up buddy systems where people sit right next to each other setting up routers, troubleshooting problems and learning together allowed her greater opportunity to ask questions in an open environment.

Networking 98

Networking Network Engineering Routers 98

Network Engineering

MAY 7, 2023

So my question, Assuming there is no other device (router/server) that can be used as DDNS client. What I want, is obviously the value would be the Public IP of SNAT from the broadband modem not the private ip of palo alto interface. DDNS Configuration: DDNS Info: NoIP record: Our environment: PANOS 10.2.4 If it is, how to do it?

Internet 52

Internet Routers Server DNS 52

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.

Firewall 52

Firewall DNS Gateway Routers 52

Kentik

JULY 8, 2019

It is the language spoken by routers to determine how packets can be sent from one router to another to reach their final destination. This method pairs routers with a server, which is aptly called a “validator”. Presenting it to the routers they are paired with.

Routers 58

Routers Protocol Internet Advertising 58

The Network DNA

NOVEMBER 26, 2024

NDNA-ASA(config-if)# nameif dmz NDNA-ASA(config-if)# security-level 70 NDNA-ASA(config-if)# no shut Configure static NAT to the DMZ server using a network object NDNA-ASA(config)# object network dmz-server NDNA-ASA(config-network-object)# host 10.10.2.3 10.10.10.100 inside NDNA-ASA(config)# dhcpd dns 112.110.112.5 255.255.255.0

Firewall 52

Firewall IP Address VPN Port 52

CATO Networks

JANUARY 17, 2018

In the light of recent ransomware attack campaigns against Microsoft RDP servers, Cato Research assessed the risk network scanning poses to organizations. As for SQL Servers, it seems like the hunt for databases still exists. Although well researched, many organizations continue to be exposed to this attack technique.

Networking 52

Networking Network Server Port 52

CATO Networks

OCTOBER 30, 2019

Routers forward these packets from source to destination and data encapsulation enables the data to traverse the TCP/IP stack. Common causes of packet loss include: Routers with heavy CPU load. Routers have a finite amount of compute capacity, if the CPU load gets too heavy, packets can be dropped. Security breaches.

WAN 52

WAN Routers TCP Protocol 52

Kentik

APRIL 3, 2023

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. Second, in a busy network, devices such as routers, switches, and firewalls may be very busy operating at a relatively high CPU.

TCP 110

TCP Application Virtual machine Networking 110

Kentik

JULY 20, 2018

Once NetFlow is enabled on a router or other network device, it tracks unidirectional statistics for each unique IP traffic flow, without storing any of the payload data carried in that session. In these cases, collectors then synchronize their data to a centralized analyzer server. Juniper MX and PTX series routers (via IPFIX).

Routers 40

Routers IP Address Protocol Server 40

Kentik

DECEMBER 18, 2019

we never initiate connections to the customers) on servers running Debian GNU/Linux. Given that we only have one IP active in on each node, the next step was to have this landing node act as a router for inbound BGP connections with policy routing as the high-level design. BGP peering uptime is part of Kentik’s contracted SLA - 99.99%.

Server 13

Server Topology TCP Networking 13

Router-switch

OCTOBER 9, 2024

GrowingDemand for Robust Networking… The post How Cisco Secures and Connects NFL Events Around the World first appeared on Router Switch Blog.

Routers 40

Routers Networking Network Firewall 40