All Questions

The first IP address of an IP subnet is the network address, which stands for the whole network, while the last address is the broadcast address. As far as I understand, we never really send packets ...

When I access my gateway's web interface, there are two sections for primary and secondary DNS servers. It is my understanding that these were selected by (and probably belong to) my ISP. My question ...

When we call the function of accept, accept function will be blocked until getting the request from a user. My question is that how accept() is works? how OS wait until getting a request? Two ...

I'm an application developer working on getting a working knowledge of network engineering, so basically a newbie. I've been trying to figure out exactly when routers decapsulate frames into packets ...

I've an ethernet connection (8Mbps), and I'm using a mobile hotspot (1Mbps Wifi). On my laptop (Thinkpad - windows 10) I've connected ethernet & connected to mobile hotspot as well. My laptop ...

I'm using Sophos SSL VPN Client. But I'm using BSNL ISP. Whenever I connect my VPN and browse any HTTP non-secured websites ADS gets injected to the JS script file. But when I disconnect an VPN and ...

I have 9 different sites and one HQ site where all 9 remote sites connect to via IPSec VPN. All are pfsense firewalls. I want to allow traffic between site 2, 3 and 4. But I do not want to configure ...

How does one access the Cisco Nexus 5000 terminal? There is a console port on the back and connecting directly to it does nothing; does it require a supervisor module or something?

Why is the congestion avoidance here [6,14] and [18,25]. Why not [6-10] and [18-22]? Other examples I have seen online suggest otherwise: For example here: https://www.researchgate.net/figure/TCP-...

According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command. https://www.oreilly.com/...

I have an ER-X (running v2.0.8) that is load-balancing two 16/1 DSL lines. I also have a lot of kids and Apple devices! I'm constantly getting ping spikes and other symptoms of buffer bloat and lag....

Confused as to how the addressing is going to work with the routers, I've subnetted the network and everything, now my question is does each router have a network address of 10.1.0.0? and only ...

I have a fiber link comming to my apartment, connecting to the "fiber reader" (i didnt really know the name of that) and connecting to a wifi router. Problem is, my laptop had a crap wifi receiver, ...

i have GPON router mode number EchoLie hg8245C It was working fine untill i uncheck the option ofenable SSID now neither the wifi is no nor i can access the router via lan cable i.e it is not taking ...

I've been trying to understand if there's a difference between the two, if any. Wireshark mentions SEQ-ACK under their TCP information of a packet, but I've typically heard this referred to as SYN-ACK....

I've got the following route configured on my Macbook: 204.141.28/22 192.168.1.1 UGSc en0 But when I check some sample addresses in that route, it appears the first IP address ...

I'm running a Ubuntu 16 based distro on a device, and get no response to ssh requests on port 22 (I am sniffing with tcpdump on the device, and can see the ssh request coming in, but nothing is sent ...

I recently moved into an old house. Were the internet is suboptimal. Right now it looks something like this: The Coaxial cable from the provider goes into the Provider Router in the basement. Then ...

How to choose the most recommended Junos release for MX router? I need to choose a Junos OS release to update my Juniper MX960 routers from release 18.1R3, but I cannot find a procedure or best ...

I'm having difficulties with something I initially thought would be rather simple. I need to apply an outbound firewall filter on an MX10003's management interface. I'm currently using Lo0.0 as the ...

I've been reading about DHCP and see that it uses limited broadcast to send its initial request to reach a DHCP server. I read about limited broadcast too which says it sends the message to every ...

Something very strange here. Today I noticed a device was unreachable. Giving a look at the switch it connects to (Cisco 3750), the port was in err-disabled due to link-flap: #sh int g1/0/15 status ...

I'm running OPNsense 20.1 on normal consumer hardware to manage a company LAN. I've been doing it for about 2 years, without issues. My setup is like this: ISP provides me with a modem/router An ...

We want a method to sanitize Cisco IOS 15 routers (ISR Gen 2) before they are removed from the facility. While a "write erase" works perfectly if the router is breathing, how to sanitize dead routers ...

I have a problem with connection Windows VM to internet in GNS3 I've configured nat and dhcp on cisco router. VM can ping 8.8.8.8, but can't "ping google.com". Dns on router is enabled, and router ...

I am debugging and application between server and client that talks through TCP, without having a great knowledge on the subject. The servers seems to reset quite often the connection and I don't ...

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...

I work in an environment where i have to log into multiple routers and get basic bgp , interface details etc. Unfortunately these routers are only accessible via logging into a gateway switch and then ...

I am trying to get a minimal NAT hole punch example working. I think the problem is that the Server and one of the clients are on the same subnet. For that client I only see some local ip from the ...

I want some suggestion regarding our network issue: From our office location to our DC ==> it's ~270msc(office and DC lies in different countries). As, you can already see here latency is the major ...

I am at the stage of designing a VPN network. Unfortunately, I have no experience in this type of installation, which is why I would like someone to help me, or at least direct me. I am currently ...

experts I want to make things clear as my networking knowledge is very limited. I have a quad-core home router, TP-Link C4000. And I also have Cisco SG350 layer 3 managed switch, a business class ...

This just for personal interests, let's assume I want to investigate a case as a police officer. I wonder from a technical perspective which Pc components save memory. (Including the router) Using ...

I'm using VyOS to create a BGP lab. It has 6 routers, each in an iBGP pair, and 3 autonomous systems. Routers 1 & 2 - AS1111 Routers 3 & 4 - AS2222 Routers 5 & 6 - AS3333 All routers are ...

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...

Trying to have the following scenario: (everything is running on the same machine) Client container (172.19.0.2) <-> proxy1 (running on localhost:4000) <-> proxy2 (running on localhost:...

I have my CISCO 1941 series Router, i create two sub-interfaces which passing internet and MPLS traffics respectively, but recently days i experience a certain scenario where by either of the ...

I have two domains, lets call them example.com and example.de I need to have all emails sent to an (any) example.de address being forwarded to the example.com email server. Is it enough to place an ...

can help me ? how to configure AP ?

I have come across a question that I can not seem to get a quality answer to. I understand how NAT works when a reply packet is received and how it is mapped back to an internal IP address from the ...

I know the methods used for this won't be exclusive to IoT devices, but my post is about them because they make things a little less abstract. So to my understanding there's two methods that are used ...

ACI Path Tenants > Networking > External Routed Networks > In the area with the routing protocol check boxes, there are a few options such as BGP, OSPF, and EIGRP. In this image, BGP and ...

In APIC, the implementation of AAA can be seen in the following path: APIC > ADMIN > AAA > RADIUS Management > RADIUS Providers APIC > ADMIN > AAA > TACACS+ Management > ...

I have a cellular IoT-device connected to a MQTT broker with a keep alive of 15 sec. It happens once a day that the device gets disconnected from the server (server log shows: client stopped due to ...

I have just bought an access point D-Link DAP-2610 and it does not come with a power supply so I want to power it via PoE using eth5 of my Mikrotik Hex S. When I plug in my device, RouterOS in Winbox ...

I have a FRITZ!Box 7490 that has 4 gigabit LAN ports. Since I have a lot more devices than that I'd like to connect them to a 16 port switch and connect that switch to to the FRITZ!Box. Since I also ...

Is there anyone who has the experience to configure FortiGate SSL VPN split-tunneling to route FQDN object? What I am trying to do is we need to access some websites that can only use our office WAN ...

In APIC, the status (enabled/disabled) of HTTP, HTTPS, SSH, and Telnet state can be viewed in the following path: APIC > Fabric > Fabric Policies > Pod Policies > Policies > Management ...

In wireless networks resource allocation is a significant issue which has caught the interest of researchers. Bandwidth is one of the vital resources in any wireless networks. Consider a case of ...

In Nmap port scan there is a Covert scanning which use FIN for scanning, but it is not accurate, because the FIN packet easy be discard in transmission. Why there is a statement of FIN packet is ...