Network Engineering

FEBRUARY 28, 2025

I am working 2 cisco firepower 1120 firewalls, which are connected to a 5-port layer-2 switch through their "outside"(Ethernet1/1) interfaces, each with an IP address of the form 192.168.1.x On that same switch, I have a computer with the same IP format of 192.168.1.x, x with a subnet mask of 255.255.255.0.

Firewall 130

Firewall IP Address Gateway Port 130

Network Engineering

MARCH 14, 2025

I was thinking about two possible approaches: Mirror RX traffic on a server-side switch port and redirect it to another device running packet sniffer.

TCP 130

TCP IP Address Server Internet 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

FEBRUARY 12, 2020

I have an internal web server on port 80. I need help commands maybe to configure port forwarding to access the server on my private network from a public IP Current running config interface Tunnel1 ip unnumbered GigabitEthernet0/0/0 tunnel source X.139.250.X ip nat outside negotiation auto ! X 255.255.255.0

IP Address 130

IP Address Server VPN Port 130

Network Engineering

DECEMBER 16, 2015

Our Outside interface and DMZ interfaces have routable IP addresses and DMZ subnet is routed via IP address of the outside interface. interface GigabitEthernet0/0 nameif outside security-level 0 ip address 123.123.6.243 255.255.255.248 interface GigabitEthernet0/1 nameif inside security-level 50 ip address 192.168.50.4

IP Address 130

IP Address Port TCP Server 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 Networking 130

Network Engineering

FEBRUARY 2, 2024

However, I'm encountering difficulties at the step where I need to configure a routed port or a static route. vlan database vlan 10,20 exit interface vlan 1 ip address 101.205.25.252 255.255.255.0 no ip address dhcp ! vlan database vlan 10,20 exit interface vlan 1 ip address 101.205.25.252 255.255.255.0

IP Address 130

IP Address Port Routers 130

Network Engineering

APRIL 13, 2020

Where lies the link between symmetric NAT and that each request is mapped to a unique external source IP address and port? After searching a while, I'm still not able to find a logical explanation on why it's called symmetric NAT. Is there any at all?

IP Address 130

IP Address Port Networking Network 130

Network Engineering

APRIL 7, 2022

When I connect a device to port 3 or 5, regardless if I have the port set to auto or I assign a static IP, I can not get anything to connect to the VLAN1 or VLAN2 (I am doing all this with the managed led on) I am sure I missing something simple. Anyone see what I am doing wrong? Thank You.

Port 130

Port IP Address Routers 130

Network Engineering

JANUARY 10, 2025

On B, I have the following iptables rules: sudo iptables -t mangle -A PREROUTING -d 239.0.0.2 --protocol udp --destination-port 23000 -j TEE --gateway 172.21.0.3 sudo iptables -t mangle -A PREROUTING -d 239.0.0.2 --protocol udp --destination-port 23000 -j TEE --gateway 172.19.0.2 over tun0 : sudo ip route add 172.21.0.3

IP Address 130

IP Address Port Gateway Protocol 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.

IP Address 130

IP Address Network Networking Routers 130

4sysops

MARCH 22, 2025

Customers can use these functions to manage flows based on source/destination IP addresses, ports, and protocols, improving the handling of network traffic. This feature includes Flow Capture, which provides snapshots of current flows, and Flow Flush, allowing selective termination of specific connections.

Firewall 52

Firewall IP Address Network Networking 52

Network Engineering

JANUARY 14, 2025

What I want to happen is to generate packets to go from Port 0 to reach the interface 1 in VPP and gets routed there to the interface 2 of VPP and from there get back at TRex port 1. I connected two 10GbE X710 cables between TRex and VPP machine which are both Linux and safely assigned those interfaces to dpdk-compatible drivers.

Ethernet 130

Ethernet Port IP Address MPLS 130

CATO Networks

MAY 20, 2024

In the ever-evolving threat landscape, identifying and blocking malicious IP addresses is an essential defense mechanism. Unlike domain names, the registration details for IP addresses are less transparent, making it more challenging to access ownership information, registration dates, and the responsible parties.

IP Address 52

IP Address Server Port SMB 52

Network Engineering

AUGUST 12, 2019

I am so confused with fundamentals that I used to be an expert in, so I have this topology Please answer to my questions separately, Question 1) So if I have two DNS severs, and ofc two IP address(81.1.1.30 & 31) available from the ISP This config would be suffice for Port forwarding? Switch3650(config-if)#ip add 81.1.1.30

IP Address 130

IP Address Topology DNS Port 130

NW Kings

FEBRUARY 28, 2025

It covers various essential topics, such as network fundamentals, routing and switching, IP addressing, and basic security principles. DHCP automates the process of assigning IP addresses to devices on a network. NAT allows multiple devices on a private network to access the internet using a single public IP address.

Firewall 52

Firewall IP Address Network Networking 52

The Network DNA

JUNE 28, 2024

Introduction to Micro-BFD ( BFD over Port channel) Micro BFD sessions are those that run on member links of the port channel. Micro BFD sessions are available for both LACP and non-LACP-based port channels. This approach provides faster failure detection because BFD sessions are formed on individual port-channel interfaces.

Port 52

Port IP Address WAN Bandwidth 52

Network Engineering

JULY 25, 2016

Im trying to get pinging/telnet enabled for a certain port so i can get through from outside to inside or vise versa. interface Vlan1 no ip address ! interface Vlan10 ip address 192.168.1.11 ip classless ip http server ! ! ! interface Vlan1 no ip address no ip route-cache !

Firewall 130

Firewall IP Address Encryption Server 130

Network Engineering

JUNE 2, 2016

Right now I have the VLANs setup and I have the required ports set to 'Access' mode and 'untagged' with the PVID set to the appropriate VLAN. The global gateway is set to the IP of the router. (I The gateway for both of those routes is the IP for the VLAN10 interface (192.168.10.16). L3 MAC Address. 192.168.10.25

Routers 130

Routers Gateway IP Address Port 130

NW Kings

DECEMBER 10, 2024

Understanding TCP ports is essential for managing network traffic and ensuring effective communication. But what is a TCP port? This blog will delve into what a TCP port is, how it works, its significance in networking, and the different types of ports, including well-known and dynamic ports. What is a TCP Port?

UDP port 40

UDP port TCP Port IP Address 40

The Network DNA

MARCH 6, 2025

LDAP Server: Enter the IP address or FQDN of your LDAP server. Port: The default port for LDAP is 389 (or 636 for LDAP over SSL). Should you encounter connectivity problems, investigate potential network obstacles, such as firewalls that might be obstructing the LDAP port. dc=example, dc=com).

Firewall 52

Firewall Network Networking IP Address 52

Network Engineering

FEBRUARY 27, 2024

My goal is to have the NAT apply only when the target is accessed over HTTP; otherwise, the target should be accessible normally over all other ports as before.

Firewall 130

Firewall IP Address Port 130

Network Engineering

AUGUST 27, 2024

I have deployed a Mikrotik and connected it to the eth0 port on the cloud interface. On GNS3 server, when I run IP address show, I get a bunch of results. I feel like I should be able to do this but I am not sure what I am doing wrong. I have a GNS3 server deployed in Digtal Ocean.

Advertising 130

Advertising IP Address Port Server 130

Kentik

JANUARY 24, 2022

You can also learn about the protocols in use, the ports being used, the top interfaces, etc. Source IP address. Destination IP address. IP protocol. 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.

Application 96

Application IP Address DNS Port 96

Network Engineering

JANUARY 5, 2024

I have a VRF set up with 2 L3 ports on it - Eth1/33 has ip address 20.20.255.250/16 and is nat inside Eth1/34 has ip address 10.10.1.211/24 and is nat outside Full config of the interfaces: switch1# show running-config int eth1/33-34 !Command: I'm trying to get Twice-NAT working on a Cisco 3548 switch.

IP Address 130

IP Address Port Network Networking 130

CloudFaire

MARCH 19, 2025

However, given our architecture design, we have primarily handled private network application access (applications tied to private IP addresses or hostnames) through the network firewall component of our Secure Web Gateway (SWG) service, Cloudflare Gateway. Any device or virtual machine will have a private IP address.

Application 86

Application IP Address Gateway DNS 86

CloudFaire

MARCH 21, 2025

The two main offenders are weak user sign-in credentials and unrestricted port access. Bad actors have abused RDPs default port, 3389, to carry out on-path attacks. This approach would have sidestepped the need to expose new IP addresses and benefitted from the existing scaffolding to let the team move quickly.

Protocol 129

Protocol Server TCP Gateway 129

CloudFaire

MARCH 24, 2025

Simplify allowlist management and lock down origin access with Cloudflare Aegis Cloudflare Aegis provides dedicated egress IPs for Zero Trust origin access strategies, now supporting BYOIP and customer-facing configurability, with observability of Aegis IP address utilization coming soon.

Email 95

Email Application Firewall IP Address 95

The Network DNA

JULY 16, 2024

This is similar to Address Resolution Protocol, which maps layer 3 IP addresses to the layer MAC addresses. IP address. 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). with 0x4a::56.

Protocol 98

Protocol Ethernet IP Address LAN 98

CloudFaire

JANUARY 3, 2025

After the initial TCP handshake, each peer may announce additional addresses (and ports) on which it can be reached. First, in the handshake TCP packet each peer specifies the " Do not attempt to establish new subflows to this address and port " bit, also known as bit [C], in the MPTCP TCP extensions header. 4321 hmac 0x.,nop,nop],

TCP 140

TCP Port Server Advertising 140

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. I'm comfortable with port numbers and speeds, backplane, etc. - it is the networking/routing side that I'm unsure about.)

Network 130

Network Networking IP Address Port 130

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. The Race to Stop Mirai.

Port 81

Port IP Address Internet Network 81

NW Kings

MARCH 25, 2025

The exam covers topics like: Network Fundamentals: IP addressing, subnetting, OSI model , TCP/IP model, network topologies, cabling. Network Access: VLANs, spanning tree protocol (STP ) , port security, EtherChannel. IP Connectivity: Routing protocols (OSPF, EIGRP), static routing, inter-VLAN routing.

Protocol 52

Protocol IP Address Topology Network 52

Network Engineering

APRIL 23, 2014

I know I need to allow GRE and PPTP 1723 thru as well as port forward 1723 to the Win 2012 internal IP. interface Vlan2 nameif outside security-level 0 ip address 1.outside.ip.1 interface Vlan5 nameif dmz security-level 50 ip address 192.168.2.1 access-list inside_nat0_outbound extended permit ip 192.168.1.0

IP Address 130

IP Address VPN DNS Encryption 130

Network Engineering

JULY 3, 2021

interface Vlan1 nameif inside security-level 100 ip address 192.168.1.1 interface Vlan2 nameif outside security-level 0 ip address dhcp setroute ! 0: Int: Internal-Data0/0 : address is 30f7.0d7e.96c7, 96c7, irq 11 1: Ext: Ethernet0/0 : address is 30f7.0d7e.96bf, interface Ethernet0/4 ! 255.255.255.0 !

VPN 130

VPN IP Address Encryption TCP 130

The Network DNA

JUNE 3, 2024

The internal load balancer is assigned a private IP address from the virtual network's subnet range for the frontend and targets the private IP addresses of backend services (often Azure virtual machines). We can select options for Public IP address (new or existing), SKU, assignment, and IPv6.

IP Address 52

IP Address Port Protocol Virtual machine 52

The Network DNA

JUNE 10, 2024

It's an essential component that keeps track of the mapping between real IP addresses and their translated (mapped) counterparts. This table is required for the firewall to maintain and translate private IP addresses to public ones, allowing communication over the internet. TCP, UDP, ICMP). Free Tools.

Firewall 52

Firewall IP Address TCP Port 52