CloudFaire

DECEMBER 30, 2024

A recap of QUIC and HTTP/3 QUIC is a secure-by-default transport protocol that provides performance advantages compared to TCP and TLS via a more efficient handshake, along with stream multiplexing that provides head-of-line blocking avoidance. Server receives the request HEADERS frame and validates it against RFC 9114 rules.

Protocol 101

Protocol Server Internet TCP 101

Kentik

JANUARY 13, 2021

Send these pings using the Internet Control Message Protocol (ICMP) or TCP to one or any of the devices you believe to be involved. Ping is a utility that’s available on practically every system, be it a desktop, server, router, or switch. If that’s the case, you should consider TCP Traceroute on Linux, which switches to TCP packets.

Network 114

Network Networking TCP Protocol 114

The Network DNA

JUNE 3, 2024

The load balancer sends requests to defined endpoints in the backend pool, which fail if directed to an unavailable server. Rules enable port mapping from a load balancer's frontend to the backend pool, creating port relationships and forwarding incoming traffic. These components identify issues and define appropriate responses.

IP Address 52

IP Address Port Protocol Virtual machine 52

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

AUGUST 18, 2022

Additionally, policy rules can be further refined based on application context including application (custom applications too), application categories, service, port range, domain name, and more. 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

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

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

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

Kentik

SEPTEMBER 20, 2016

For example, using SNMP or flow data to track traffic volume on interfaces, servers, and devices can provide necessary visibility into possible congestion points. In this post we’ll talk about using Kentik’s NPM solution to watch the TCP performance of traffic as reported to Kentik Detect from a Kentik nProbe host agent.

Network 40

Network Networking TCP Server 40

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

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. allow database synchronization across two VLANs located in separate datacenter rooms over a specific protocol/port.

LAN 52

LAN Cloud Firewall WAN 52

Kentik

DECEMBER 5, 2016

Next we set Metric (still in the Query pane) to look at the percentage of TCP retransmits. In the Filters pane, we filtered to show only dest port 179 (BGP). What immediately jumps out from the graph is that there is a significant spike in the percentage of retransmitted TCP packets for these three hosts. Where in the World?

Network 40

Network Networking TCP IP Address 40

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

NOVEMBER 23, 2015

According to Akamai’s Q1 2015 State of the Internet report , over 50% of volumetric attacks are IP flood attacks involving a high volume of spoofed packets such as TCP SYN, UDP, or UDP fragments. So next we’ll look at the protocol and destination port # of the traffic. Diagnosis by Destination IP. Assessing mitigation options.

IP Address 40

IP Address Port Protocol Internet 40

CATO Networks

FEBRUARY 26, 2020

NGFW also supports the creation of custom application definitions to enable identification of specific apps based on TCP/UDP port, IP address, or domain. Additionally, a Deep Packet Inspection (DPI) engine enables contextualization of traffic. SWG focuses on layer 7 traffic exclusively and inspects inbound and outbound flows.

Network Security 52

Network Security Network Networking UDP port 52

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. Bad hardware (the switch or router port). UDP vs. TCP.

Cloud 116

Cloud TCP Routers Protocol 116