Kentik

MAY 21, 2019

In short, the Mirai network of bots was built by malicious actors who exploited remote access and control protocol ports over many different device types, producing damaging traffic levels and creating an advanced, powerful tool that can be used for large-scale DDoS attacks and many other nefarious purposes.

Port 81

Port IP Address Internet Networking 81

Network Engineering

JANUARY 15, 2025

I have a TCP server running on my Ubuntu gateway computer at 10.0.0.1:8080. My Wi-Fi is connected to the gateway's LAN (enp4s0) port, and my modem is in bridge mode and plugged into enp3s0. I can tell the service is working correctly because when I use curl -x 10.0.0.1:8080

LAN 52

LAN Gateway TCP Port 52

NW Kings

DECEMBER 16, 2024

This blog will explore the key protocols within the transport layer, focusing on TCP ( Transmission Control Protocol ) and UDP (User Datagram Protocol) in detail. This layer operates on two primary protocols: TCP and UDP , each serving different purposes in data transmission. What is the Transport Layer?

Protocol 40

Protocol TCP Port Networking 40

The Network DNA

JULY 16, 2024

A switch forwards the broadcast out all the ports in same VLAN (except the port where broadcast was received). To do that it builds the Ethernet Frame and puts its MAC address as the Source MAC address (SMAC) and layer 2 broadcast address (ff:ff:ff:ff:ff:ff). All hosts in same VLAN received this ARP request including PC-2.

Protocol 98

Protocol Ethernet IP Address LAN 98

Network Engineering

DECEMBER 16, 2015

1 I am trying to PAT 123.123.27.134 port 22 to 192.168.60.20 port 22 object network inside-ssh-host host 192.168.60.20 1 I am trying to PAT 123.123.27.134 port 22 to 192.168.60.20 port 22 object network inside-ssh-host host 192.168.60.20 Stripped for readability. 255.255.255.0 255.255.255.0 192.168.50.1 255.255.255.0

IP Address 52

IP Address Port TCP Server 52

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. In some cases if ICMP is filtered, you can usually switch to TCP (Transmission Control Protocol) and use tcping, telnet, or another TCP-based method to check for reachability.

Networking 114

Networking Network TCP Protocol 114

The Network DNA

JUNE 10, 2024

Original Source and Destination Addresses: These are the original IP addresses and port numbers of packets when they enter the firewall. Translated Source and Destination Addresses: After performing any NAT or PAT operations, the xlate table stores the translated IP addresses and port numbers. TCP, UDP, ICMP).

Firewall 52

Firewall IP Address TCP Port 52

Heroku

NOVEMBER 21, 2024

Our first thought was that perhaps the legacy router is faster at forwarding requests to the dyno because its underlying TCP client manages connections in a way that plays nicer with the Puma server. ec2:11059 tcp 0 0 ip-10-1-87-57.ec2:28631 ec2:11059 ESTABLISHED tcp 0 0 ip-10-1-87-57.ec2:30717 ec2:11059 tcp 0 0 ip-10-1-87-57.ec2:24630

Routers 59

Routers TCP Server DNS 59

The Network DNA

JUNE 24, 2024

This table is populated automatically when a switch receives a frame on a port. As a frame is received on a port, its source MAC address is noted. The switch receives the frame from PC-1 that contains the MAC address 80::01 on port 1. Port 1 is configured as a member of VLAN-11. Then PC-1 wants to communicate with PC-2.

Ethernet 52

Ethernet Port LAN Protocol 52

The Network DNA

JUNE 3, 2024

Rules enable port mapping from a load balancer's frontend to the backend pool, creating port relationships and forwarding incoming traffic. If we enable high-availability ports (only available on internal load balancers), this will remove the protocol options and enable load balancing on all ports for TCP and UDP protocols.

IP Address 52

IP Address Port Protocol Virtual machine 52

Kentik

JUNE 7, 2023

They capture detailed information about network traffic, including: Source and destination IP addresses Ports Protocols Packet counts By analyzing these logs, you can gain visibility into the volume, patterns, and characteristics of traffic, such as whether it’s being dropped or incorrectly routed, to identify connectivity issues.

Cloud 97

Cloud Gateway Port IP Address 97

Kentik

AUGUST 10, 2021

For instance, a network engineer for a large government agency once told me: “We asked ourselves as a network team, are we in the business of troubleshooting application transactions and sessions, or do we terminate our responsibility at the TCP layer? Everything else is an application issue. I manage the applications that run on it.

Networking 85

Networking Network Cloud DevOps 85

DoorDash Engineering

AUGUST 15, 2023

With these hooks, we can intercept and understand TCP and UDP connections across our multiple Kubernetes clusters. For TCP, we use two probes to track when a connection is initiated and when it is closed. maps"); To emit a TCP connection event, we await the tcp_close call associated with the connection established by tcp_connect.

DNS 84

DNS TCP Application Networking 84

Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f tcpdrop allows you to trace TCP packet drops. tcpconnect allows you to trace active TCP connections. tcpretransmit allows you to see the retransmission of TCP packets when an acknowledgement expires, a common cause of latency.

TCP 110

TCP Application Virtual machine Networking 110

Network Engineering

DECEMBER 11, 2023

SITE B WAN IP OF THE GATEWAY] 1 SHOW LOGS ASA-1/pri/act# show crypto ipsec sa Doesnt show the active vpn connection ASA-1/pri/act# packet-tracer input inside tcp 10.113.1.11 port=0, tag=any dst ip/id=0.0.0.0, port=0, tag=any dst ip/id=0.0.0.0, port=0, tag=any dst ip/id=10.1.10.0, port=0, tag=any dst ip/id=0.0.0.0,

VPN 52

VPN Port Protocol WAN 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

Scott's Weblog

AUGUST 5, 2024

Before getting into the details, I think it’s useful to point out that I’m talking about using SSH port forwarding (SSH tunneling) here, but Talos Linux doesn’t support SSH (as in, you can’t SSH into a Talos Linux system). This command does NOT allow you to specify a target port—it always assumes port 50000.

Port 40

Port TCP Networking Network 40

CATO Networks

APRIL 19, 2021

Traditionally, port 80 of the firewall bore extra scrutiny because this is where web traffic came in. But as applications and networking evolved, firewalls needed to look beyond port 80 to make a determination whether or not a packet flow was malicious.

Firewall 52

Firewall SASE Network Security Port 52

Akins IT

APRIL 27, 2020

The TCP transport protocol is used instead of UDP and typically defaults to port 443 (can also be changed to a custom port). SSL VPN SSL VPN on the other hand uses SSL to establish connections (think HTTPS) and operates at the application layer (Layer 7).

VPN 52

VPN Protocol Port TCP 52

Kentik

NOVEMBER 4, 2018

In addition to basic data like source and destination IP address, port, protocol, etc., we collect network performance metrics like TCP connection setup latency, retransmitted and out-of-order packet counts, and window size.

IP Address 67

IP Address Protocol TCP DNS 67

Kentik

MAY 2, 2018

We can see that most of the traffic is UDP port 53 DNS traffic but there is a little bit that is TCP port 53. To get an even better idea of the distribution of the traffic across the various hijacked prefixes, let’s take a look at a Sankey diagram.

IP Address 49

IP Address DNS UDP port Advertising 49

CATO Networks

MARCH 24, 2020

A hacker could attack systems from outside the enterprise network directly if a systems SMB port has been left open to the Internet. By default, Windows Firewall blocks external connections to the SMB port, however. An attack using this vulnerability could happen in a few ways.

SMB 52

SMB Port Server Protocol 52

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. HTTP/2 and HTTP/3 use TCP, UDP and IP. See the cargo documentation for more information.

Protocol 101

Protocol Server Internet TCP 101

Kentik

MARCH 13, 2019

Destination port. Source port. These attributes are added to the NLRI field within the BGP Update Message that’s advertised to peers and define the particular traffic that the Flowspec route will match. Destination Prefix. Source Prefix. IP Protocol. Packet length.

IP Address 49

IP Address Port Routers DNS 49

Network Engineering

JULY 3, 2021

threat-detection basic-threat threat-detection statistics access-list no threat-detection statistics tcp-intercept webvpn username cisco password 3USUcOPFUiMCO4Jk encrypted ! ftp mode passive pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-7161.bin

VPN 52

VPN IP Address Encryption TCP 52

Kentik

DECEMBER 2, 2015

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. First, we’ll write a query to get a list of all the hosts in the network that are receiving traffic from remote source port TCP/25 (the traffic described in Step 2 above).

TCP 40

TCP Protocol Port IP Address 40

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. Clues from AS Path.

Networking 40

Networking Network TCP IP Address 40

Kentik

NOVEMBER 15, 2018

The following is an example of a flow log record in which SSH traffic (destination port 22, TCP protocol) to network interface eni-abc123de in account 123456789010 was allowed: You can find more details, including the structure of each flow record and possible limitations in the AWS user guide. Image source: AWS.

Network Interface 63

Network Interface Cloud TCP Port 63

Kentik

SEPTEMBER 20, 2016

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. TCP is the key. Specifically TCP, which is used in over 90% of network transactions. As an example, we’ll use traffic from Kentik’s own servers.

TCP 40

TCP Networking Network Server 40

Kentik

OCTOBER 2, 2015

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. Define a TCP Syn alert based on the queries provided in Defining an Alert below. supplemental 1: layer 4 destination port.

Port 40

Port Protocol Server Bandwidth 40

CATO Networks

JULY 18, 2018

Using the robust DPI engine underlying Cato Cloud, were able to detect and classify hundreds of SaaS and datacenter applications regardless of port, protocol, or evasive technique and without SSL inspection. A variety of TCP enhancements increase throughput when accessing cloud and WAN resources.

WAN 52

WAN IP Address MPLS Financial 52

CATO Networks

SEPTEMBER 11, 2023

allow users on the corporate VLAN to access printers located in the printer VLAN, over specific TCP ports. allow database synchronization across two VLANs located in separate datacenter rooms over a specific protocol/port. allow IOT devices (e.g.

LAN 52

LAN Cloud Firewall WAN 52

Kentik

DECEMBER 8, 2016

In networking terms, a “flow” defines a uni-directional set of packets sharing common attributes such as source and destination IP, source and destination ports, IP protocol, and type of service. Source & dest port. Not Just for NetFlow, Kentik Detect’s Analytics Cover All Major Flow Protocols. Flow Data Variations. Next hop IP.

Protocol 40

Protocol Port Routers Networking 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. First, in the Group by Metric drop-down, choose Full » Proto.

IP Address 40

IP Address Port Protocol Internet 40

Kentik

SEPTEMBER 11, 2018

In networking terms, a “flow” is a unidirectional set of packets sharing common attributes such as source and destination IP, source and destination ports, IP protocol, and type of service. IP/ICMP/UDP/TCP. NetFlow records can be generated based on every packet (unsampled or 1:1 mode) or based on packet sampling. Packet Capturing.

Protocol 66

Protocol Ethernet Networking Network 66

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 Networking Network UDP port 52

CATO Networks

MAY 20, 2020

NGFWs can drill down beyond IP addresses, TCP/UDP ports, and network protocols to enforce policies based on packet content. Secure Web Gateway (SWG) Web-borne malware is one of the biggest threats facing enterprise networks today.

Network Security 52

Network Security Networking Network UDP port 52