Network Engineering

AUGUST 16, 2024

I have a problem, that I cannot bring together working PAT and Port forwarding on a Cisco router. with destination port 1234 and destination ip address 192.168.1.2 Then router forwards connection to destination ip address 192.168.2.2 When forwarding the packet out of f0/0 to ip address 192.168.2.2

Port 130

Port Routers IP Address Topology 130

Network Engineering

APRIL 8, 2025

Problem Statement: I have two houses ( House1 and House2 ) connected via a WireGuard VPN setup, with routers acting as intermediaries. I need to configure the network so that all internet-bound traffic from a laptop in House2 routes through House1's internet connection (specifically RouterA's public IP ).

Internet 130

Internet LAN VPN Gateway 130

Network Engineering

FEBRUARY 21, 2024

So here's the situation that I have at my workplace (local municipality): I have received from my ISP a static IP address with a provided gateway, which all works normally when I input it into my router (ISP's router works in bridge mode).

Port 130

Port WAN Routers IP Address 130

Network Engineering

AUGUST 24, 2021

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 vlan 50 is the native vlan on trunk link towards (router, FW) Routed port is configured on the physical interface with 10.0.50.1/24

Routers 130

Routers Port IP Address Media 130

Network Engineering

DECEMBER 4, 2024

24 | | [Router] [Router] | | 192.168.2.0/24 24 | | [Router] [Router] | | 172.16.11.0/24 24 | [Router C] | 192.168.3.0/24 What VPN technologies can I use to overcome these problems? SITE A SITE B [PC] [PC] 192.168.1.0/24 24 192.168.1.0/24 24 192.168.2.0/24 24 172.12.12.0/24 24 / / [ WAN ] / __/ | 172.11.10.0/24

VPN 130

VPN IP Address WAN Routers 130

Network Engineering

JANUARY 25, 2025

the devices connected to LAN 1 have an IP adress of (192.168.0.x), x), and the devices connected to LAN 2 have IP address in the form of (192.168.1.x). we have 2 different LANs, a printer and some PCs are connected to LAN 1 via an ethernet cable, and some PCs are connected to LAN 2, also via an ethernet cable.

LAN 130

LAN Ethernet IP Address Routers 130

Network Engineering

SEPTEMBER 23, 2021

How do I write a named extended ACL which will allow for traffic between a DNS from a LAN (IP address) to a DNS server at (IP address), ping from a host PC (IP address) to any destination and allow for telnet packets from a telnet server with any source address going to any destination?

IP Address 130

IP Address Routers DNS LAN 130

Network Engineering

MAY 5, 2023

I have this network when the network tries to communicate with the routers it fails. Router>enable Router# Router#configure terminal Enter configuration commands, one per line. Router>enable Router# Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z.

IP Address 130

IP Address Routers Protocol Network 130

Network Engineering

JULY 2, 2020

I'm trying to connect 4 networks with 1 router, i created 2 sub-interfaces in the router, when i tried to create the 3rd sub-interface i got this output "%Cannot create sub-interface", this is my topology: This is my Router's configuration: hostname Router ! ip cef ip ipv6 cef ! no ip address !

IP Address 130

IP Address Routers Topology Gateway 130

Network Engineering

JUNE 5, 2020

I have two private IP addresses, want to make them NAT to 203.0.113.0/2 2 public IP address. WAY 1 : Static NAT (2 ip addresses NATted to one by manually) WAY 2 : PAT (Router gives port number for each device randomly) Question is that : Why doesn't router apply the same things on Static NATting?

IP Address 130

IP Address Routers Port Network 130

Network Engineering

FEBRUARY 12, 2020

interface GigabitEthernet0/0/0 description SAF WAN ip address X.139.250.X ip nat outside negotiation auto ! interface GigabitEthernet0/0/1 description LAN ip address X.21.10.X ip nat inside negotiation auto ! interface GigabitEthernet0/0/2 no ip address shutdown negotiation auto ! X 255.255.0.0

IP Address 130

IP Address Server VPN Port 130

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 130

IP Address Routers Server Network 130

Network Engineering

DECEMBER 7, 2022

For reasons that are not important, we have a customer that wants to ensure that it can not work on an actual IP network and only direct. So, we changed our firmware so that the fixed IP addresses are 127.0.0.0 Are there any IP addresses that will not flow through a switch? and 127.0.0.1. Thank you.

IP Address 130

IP Address Network Networking Routers 130

Network Engineering

APRIL 10, 2021

The PCs can ping the other ip address just fine except the 172.16.99.x. Below is my router and switch configuration: Johor-RT (ROUTER): Current configuration : 1690 bytes ! interface Tunnel0 ip address 192.168.3.118 255.255.255.252 mtu 1476 tunnel source Serial0/1/1 tunnel destination 160.249.3.58 ! !

IP Address 130

IP Address Encryption Routers Gateway 130

Network Engineering

FEBRUARY 2, 2024

set system mode router ! vlan database vlan 10,20 exit interface vlan 1 ip address 101.205.25.252 255.255.255.0 no ip address dhcp ! interface vlan 10 ip address 101.205.10.1 interface vlan 20 ip address 101.205.20.1 255.255.255.0 ! 255.255.255.0 !

IP Address 130

IP Address Port Routers 130

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. ip dhcp pool mgmt network 10.0.0.0 default-router 10.0.0.1 domain-name LAN ip dhcp pool trusted network 10.0.10.0 default-router 10.0.10.1 ip dhcp pool untrusted network 10.0.20.0

IP Address 130

IP Address DNS Routers Server 130

Network Engineering

JULY 19, 2021

I would really appreciate ISP Int g0/0 ip add 2.2.1.1 255.255.255.252 no shut Int g0/1 IP add 2.2.2.1 255.255.255.252 no shut int g0/2 ip add 2.2.3.1 255.255.255.252 no shut int g0/3 ip add 4.4.129.1 255.255.255.252 no shut int g0/3 ip add 4.4.128.1 interface G0/0 nameif outside security-level 0 ip address 2.2.1.2

IP Address 130

IP Address Encryption Routers Network 130

The Network DNA

JULY 31, 2024

In one of the articles , we talk about layer 2 switching where switches build the MAC address table to decide where to forward frame based on the destination MAC address. Here well see how a layer 3 switch or a router transmit packets between different networks using the layer 3 destination address.

IP Address 98

IP Address Ethernet Routers NIC Card 98

Network Engineering

JUNE 2, 2016

The global gateway is set to the IP of the router. (I I tried setting to the interface of the VLAN that has the network devices but it did not accept that IP) On VLAN10 I have a port that goes to my firewall / router (Watchguard M300). L3 MAC Address. console#show ip brief Default Time to Live. 255.255.255.0

Routers 130

Routers Gateway IP Address Port 130

Network Engineering

APRIL 7, 2022

Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up.

Port 130

Port IP Address Routers 130

ByteByteGo

NOVEMBER 23, 2024

share one router with a single public IP address. When a device wants to access the internet, it sends a request to your router. The request contains the device's private IP address. The router’s NAT process replaces the private IP with the router’s public IP.

IP Address 100

IP Address Routers Internet Server 100

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 IP address. Destination IP address. IP protocol. IP type of service. Source port for UDP or TCP, 0 for other protocols.

Application 96

Application IP Address DNS Port 96

Network Engineering

SEPTEMBER 17, 2021

We are bringing our own /24s -- our provider will announce our IP blocks and then statically route our IP space to one of the usable IP address in the /29 range they supply. Our new colo space has 2x connections coming into our rack from our provider - these will be used as redundant uplinks.

Network 130

Network Networking IP Address Port 130

DoorDash Engineering

NOVEMBER 29, 2022

Vendor’s data centers have private links to their own routers which are set up in AWS Direct Connect Locations. Direct Connect Location: a high-speed AWS network traffic exchange center that contains both AWS Direct Connect routers and vendor’s routers. The VGW is a VPC edge router for exposing internal traffic.

Data Centers 97

Data Centers Cloud Gateway IP Address 97

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

JANUARY 6, 2021

The critical context that enables teams to ask questions about users, applications, and customers (and not just IP addresses and ports). Traditional WAN : WAN access switches, integrated services routers, cloud access routers. The key telemetry types to shine a light on network activity and health.

Network 128

Network Networking Gateway Access Point 128

Kentik

JULY 28, 2021

Bad hardware (the switch or router port). Overwhelmed router. Congestion in the form of high-connection utilization or an overworked router in the path is another common source of trouble. TCP traceroute : A TCP trace reaches out to every router in the path to a target destination. Miss-matched duplexing (full vs. half).

Cloud 116

Cloud TCP Routers Protocol 116

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.” tfbnw.net — which is another router inside AS32934 that belongs to Facebook. So what happened?

TCP 145

TCP DNS Server Media 145

NW Kings

FEBRUARY 24, 2025

It is a globally recognized certification that helps you recognize your skills in the following areas: Network fundamentals and access IP connectivity IP services Security fundamentals, and more In short, you get to learn how to configure and operate routers and switches. We also usually address the CCNA as CCNA 200-301.

IP Address 52

IP Address Engineering LAN Network 52

Kentik

JANUARY 10, 2022

Or, perhaps one or more of the 10-20 routers in the path needed to reach the destination gets busy for a hundred milliseconds or so. Domain lookup time : When a connection is made to a domain, the local operating system must first reach out to the DNS to resolve that hostname to an IP address. Where is the DNS?

IP Address 98

IP Address DNS TCP Application 98

NW Kings

MARCH 25, 2025

The exam covers topics like: Network Fundamentals: IP addressing, subnetting, OSI model , TCP/IP model, network topologies, cabling. IP Connectivity: Routing protocols (OSPF, EIGRP), static routing, inter-VLAN routing. Familiarize yourself with router-on-a-stick and Layer 3 switching.

Protocol 52

Protocol IP Address Topology Network 52

The Network DNA

JULY 5, 2024

Route type 2, or the advertisement route for MAC/IP: This broadcasts the MAC and IP addresses of the endpoints, or VTEPs, as well as endpoint reachability data. Ethernet segment routes, or route type 4, are used to broadcast the length of the IP address, the originating router's IP address, and the Ethernet segment identifier.

IP Address 52

IP Address Ethernet Advertising Unicast 52

The Network DNA

JULY 9, 2024

Replacing cEdge in Cisco SDWAN environment Replacing the cEdge router with another cEdge through an RMA process for Cisco SDWAN , we need to put the basic configuration on the new RMA router and should be reachable via vManage. It is important that you should know the new router serial number should be learned to vManage NMS.

Routers 52

Routers IP Address MPLS WAN 52

Kentik

FEBRUARY 2, 2023

Microsoft has since blamed the outage on a flawed router command which took down a significant portion of the cloud’s connectivity beginning at 07:09 UTC. During this re-computation process, the routers were unable to correctly forward packets traversing them.

Routers 109

Routers Internet WAN Cloud 109

Kentik

MAY 21, 2019

The Mirai botnet was first discovered back in 2016, but has continued to persist and abuse common vulnerabilities and exposures (CVEs) on IoT devices, including home routers and many other network-connected devices. These addresses were apparently port scanning IP addresses that belonged to the company sending the letter.

Port 81

Port IP Address Internet Network 81

NW Kings

JANUARY 7, 2025

In this blog, we will explore what static routes are, how they differ from dynamic routes, and how to configure them on routers like Cisco devices. This characteristic makes them efficient for routers with limited processing capabilities. What are the key features of static routes? How can I configure static routes?

Routers 52

Routers IP Address Protocol Topology 52

Kentik

AUGUST 3, 2021

When the network team investigates, they may see all types of problems such as ingress and egress points with no security policies, internal communications routed over internet gateways, abandoned gateways, abandoned subnets with overlapping IP address space, or VPC peering connections with asymmetric routing policies.

Cloud 124

Cloud Network Networking Gateway 124