Network Engineering

JANUARY 23, 2025

I have a router that uses a SIM card for connectivity, and I create a socket connection. 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 checked the firewall of the router but it seems to be deactivated.

Routers 52

Routers TCP Firewall Server 52

The Network DNA

JULY 31, 2024

Here well see how a layer 3 switch or a router transmit packets between different networks using the layer 3 destination address. Routing is performed by routers, firewalls, multi-layer switches and gateways. Any host that is not part of the source device network can be reached through the default router or gateway.

IP Address 98

IP Address Ethernet Routers Gateway 98

Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f For example, to determine latency using traffic generated from probes or by analyzing packets, that traffic would likely pass through routers, firewalls, security appliances, load balancers, etc.

TCP 110

TCP Application Virtual machine Network 110

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. Source port for UDP or TCP, 0 for other protocols. Destination port for UDP or TCP, type and code for ICMP, or 0 for other protocols. Source IP address. Destination IP address.

Application 96

Application IP Address DNS Port 96

Kentik

MAY 8, 2023

Message integrity and guaranteed delivery with TCP/IP Because IP does not require acknowledgments from endpoints, it does not ensure delivery; therefore, it is considered an unreliable protocol. On the other hand, Transmission Control Protocol (TCP) provides a connection-based, reliable byte stream.

Network 52

Network Networking IP Address TCP 52

CATO Networks

OCTOBER 30, 2019

We all get the concept: to transmit data over a TCP/IP network like the Internet requires the data be broken down into small packets (usually less than 1500 bytes) containing the relevant application data (payload) and headers. Common causes of packet loss include: Routers with heavy CPU load. Ping statistics for 203.0.113.2:

WAN 52

WAN Routers TCP Protocol 52

CATO Networks

OCTOBER 5, 2020

All Cisco products running IOS were impacted, including IOS XR Software, NX-OS Software, and RV160 VPN Router. More specifically, Cisco advisory notes that these vulnerabilities could allow an unauthenticated, remote attacker to cause the device to reload or stop forwarding traffic through the firewall.

Firewall 52

Firewall Protocol SASE Network 52