Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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Accessing server running on your laptop from mobile [closed]

I am running a python flask server on my laptop. And I could access it using https://172.24.44.19:5000/sms from my laptop. But when I make the same request from my android phone using the Postman ...
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1answer
40 views

Why is the VPN throughput reduction different when using a cellular network and when using Ethernet? [closed]

I built a VPN server using openvpn as a protocol and measured the throughput between server and client. There are significant throughput reduction at cellular network. Throughput decreased by more ...
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Share a file or web page(html would work too) to a specific person using internet [closed]

I know there are lots of methods of sharing now but I want to create a web page and publish it on the web but don't want search engines to find it.I don't even want any custom domain or any domain at ...
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18 views

how does a propagation delay is being considered as part of a nodal delay? [duplicate]

considering the definition of nodal delay, it's the time taken by the network node devices(router, switch, and hub) to process a packet and forward it to the receiver. so propagation delay is a delay ...
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1answer
36 views

What IP addresses are appropriate for a network inside an embedded device? [closed]

I am making an embedded device with two processors, a "gateway" processor which is connected to external ethernet, and a "webServer" processor, which is only connected to the ...
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3answers
339 views

Questions about NAT

So i just started learning about NAT and networking in general. As powerful as this technology may seem, it was specifically made for reducing the amount of IPV4 addresses used throughout the internet,...
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1answer
43 views

protection method that you need to know exact 3 or more ports to access network

long time ago i found an wiki article for method that protect your network from unwanted access. method was something like: attacker need to know 2, 3 or more exact ports which are open to access the ...
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1answer
55 views

Internal network inside an internal network

I have the task to integrate 4 PCs (1 server, 3 workers) into a local network (from a bigger organization). The admin of that network only allows me to integrate the server directly into the network (...
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2answers
41 views

Can't ping the second network interface connected to a switch [closed]

I have the following topology: Default Gateway1 <--> SWITCH1 <--> [ NIC2 - (Windows 10 PC) - NIC1 ] <--> SWITCH2 <--> Default Gateway2 --> Internet NIC1 is DHCP configured, ...
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1answer
20 views

Router on a Stick Switch/Router Addressing

I've been studying VLANs and the router on a stick setup. I created an example in packet tracer that is working fine. Configuration There are 2 VLANs, 10 and 20. The switch port Fa0/0 is an access ...
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2answers
37 views

Why does the Transport layer break data into packets? How does that make things reliable? Isn't the Network layer doing the same thing?

I'm new to CNs and there is something that I can't yet grasp. Why doesn't the Transport layer let the Network layer do all the splitting up? How does segmentation make things reliable? Also, I ...
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1answer
29 views

Does RIP v1 store next hop in its routing tables?

Does RIP v1 routing protocol store "next hop" field in its routing tables despite not announcing it in the updates? And if yes, how does it do that, simply by storing the address of the node ...
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1answer
29 views

CSMA/CD computer science clarification [closed]

Im a CS student doing Networking and have a dilemma on the CSMA/CD, more specifically the explanation I have been given in class. The exercise/problem is as follow: using CSMA/CD, station A starts ...
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1answer
36 views

CISCO PACKET TRACER “INVALID IP ADDRESS”

Hi I am still new and studying about networks have here 234.1.18.6/29 address and mask but when I try it out on Packet tracer it gets me an invalid message. I cannot understand why this address are ...
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11 views

subnetting to give 4 2000 adresses [duplicate]

A large number of consecutive IP addresses are available starting at 198.16.0.0/19. Suppose that four organizations, A, B, C, and D, request 2000, 2000, 2000, and 2000 addresses, respectively, and in ...
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1answer
100 views

I can't ping the gateway IP (fe80::1) from the internal port in my fortigate 60f firewall

I am using a fortigate 60f firewall. I have configured it for both ipv4 and ipv6. I have used the SD wan (by adding wan1 and wan2) for load-balancing. Moreover, I have configure a default static route ...
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1answer
31 views

How do devices discard packets?

My question is fairly simple, I'm just not entirely sure what information I'm looking for. Let's say that a host receives a packet that is supposed to be for another host, and discards it. Where is ...
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1answer
28 views

Which protocols do mobile applications use [closed]

So when devices access web applications on the Internet they commonly use https/ftp/smtp etc.. protocols. But which protocols are used by mobile phone apps to communicate with servers. E.g Which ...
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Understanding Layer Model motivation and how it works [duplicate]

Clarification: I already read the answers in OSI Models and Networking Protocols Relantionships question, and doest not resolve my doubts. Good day, I have been studying and reading an introduction to ...
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2answers
104 views

Cat.6 RJ45 pass through connector issues

I am planning to use Cat.6 RJ45 pass through connectors in an office network with around 70 LAN cables. I am worrying if the copper wire endings open in air will have any problems when humidity is ...
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2answers
1k views

Is a point-to-point T1 line literally a line in real life?

In Packet Tracer this is how we draw a WAN link, or a T1 link: Does the "red line" here literally means there is a single cable connecting the two routers in real life? If no, then what are ...
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2answers
43 views

How do machines setup a route in a network?

So I have been reading a bit about networking, and I am a bit confused about what exactly happens after domain name resolutions. Lets say I do a get request to "some.website.com". First, my ...
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1answer
33 views

TCP ACK confusion

When a packet is being sent after the SYN ACK connection has been established between a host and a server, packets can now be sent between the hosts and a server. Sometimes, there’s a window size ...
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2answers
41 views

Questions about logical-systems of juniper

In my Juniper MX480, the logic-systems config is below: [edit] logical-systems { r1 { interfaces { ge-0/0/0 { unit 0 { family inet { ...
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1answer
43 views

Is it possible to configure Cisco ASR901 as a layer 2 VLAN switch?

I have been fiddling with a Cisco ASR901 for a while now, but I can't wrap my head around configuring it as a layer 2 VLAN switch. Is it not possible to configure one of its Gigabit Ethernet ports as ...
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29 views

What is a CNAME and what are some of its benefits? [closed]

What is a CNAME and what are some of its benefits? For example, how does it differ from A & AAAA records?
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1answer
31 views

what are scenario where re-transmission packets can been seen in wireshark logs

While troubleshooting i came across this challenge ,able to see retransmission packets continuously in packet capture . please let me know in what scenarios this retransmission packets are seen.
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1answer
24 views

what is significance of proxy id while configuring site to site vpn tunnel . why we should use proxy id and in which scenarios

i came know about proxy id configuration for first time. when iam troubleshooting site to site vpn tunnel configuration along with vendor . post configuring proxy id issue got resolved . But iam still ...
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0answers
23 views

Bit confused in difference between (RST) & ( RST ACK) Packets on logs [duplicate]

what might be main difference between [RST] & [RST ACK] packets in Wireshark logs . is there any significant difference among this two scenarios or both are same . please highlight.
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1answer
30 views

Why is Cisco router PPPoE client configuration so complicated? [closed]

In some routers like Ubiquiti's UniFi Security Gateway, when you want to connect to internet via PPPoE, all you have to do is go to the web GUI or controller, go to WAN settings, hit the dropdown ...
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3answers
82 views

Why does a queue of a network device like router starts to fill up if the arrival rate equals the transmission rate of the outbound link?

In the book "Computer Networks: A Top Down Approach by Kurose" it is written that when the traffic intensity approaches 1, the average queue length gets larger and larger. Traffic intensity ...
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1answer
38 views

Establish a network between two remote systems

Is it possible to create a network between remote systems without internet? if true; how?
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1answer
30 views

Why I am Getting %100+ Network Usage From SNMP? [closed]

I am using SNMP in Ubuntu 20.04 to get the network usage info and I am using this formula to calculate the network usage: InOctets : The difference between two poll cycles of collecting the snmp which ...
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1answer
25 views

test etherchannel load-balance command doesn't work

I am trying to learn the etherchannel environment but when I enter this command it gives an error. Switch#test etherchannel load-balance interface po1 mac 00d0.ba86.1e19 00d0.ba86.1e1a ^ % ...
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1answer
209 views

What are the differences between root primary and secondary?

Hello I am new at networking and studying for CCNA. There is a paragraph like this in the book and I am struggling about understanding well. Maybe it's because english is not my native language. ...
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2answers
62 views

Why the iBGP's loopback network is not valid in AS?

This is my test topology: this is my Routers' detail configuration: <R1>display current-configuration # sysname R1 # router id 1.1.1.1 # aaa authentication-scheme default authorization-...
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1answer
70 views

How does STP attack work?

I was reading how STP works and an idea came to my mind. I thought about an attacker can add a new switch (somehow, i don't know if it can be done remotely) or can manipulate the existing switch's ...
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1answer
43 views

Why the iBGP received network is not valid?

I test the BGP in my PC, this below is the topology: R1--(eBGP)--R2--(iBGP)--R3. and R2-R3-R4 are in OSPF(omit details). this is my detail configuration of BGP: [R1-bgp]dis this # bgp 100 peer 10.1....
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2answers
27 views

How does the VTP Client update it's information if the revision number is equal?

I am new to networking and my questions may be a bit weird. Please correct me if I am wrong. According to what I understand, Client updates it's information with the Server's if the Server's revision ...
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1answer
19 views

Understanding the BGP Peer point, BGP Peer and BGP peering session

In my test case, there have 3 ASs. the connections is below: I want to use this case to understand the BGP peer , BGP peering point and BGP peering session. in my understanding: BGP peer means the ...
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1answer
39 views

Why the route comes from different AS?

Before, I know the AS path of BGP properties, such as the 200 100i means the route originate from AS100, use network import the route and through AS200, however in my case: admin@MX480> show route ...
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1answer
19 views

Enabling interface TenGigE0/0/2/0 pls help

I'm trying to enable just one SFP+ port for testing a 10gbit NIC. I cannot, however, for the life of me find how to enable a port. To me, it would make sense to conf t interfaces TenGigE0/0/2/0 admin ...
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1answer
44 views

How routers route packets to a specific network

As I understand it, routers route packets to a specific network based on network id and of course the network id must be unique on the Internet, now the question is: maybe there are billions of ...
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1answer
39 views

What is the maximum number of networks in IPv4?

From my understanding, in IPv4 addressing, the first 2 octets identify the network, meaning 2^16 networks can exist. But that doesn't seem even closly enough as the population in even USA is above 300 ...
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1answer
33 views

Why CSMA/CD and CSMA/CA are classified as broadcast based?

In CSMA/CD and CSMA/CA , why the Communication mode for these two access methods are classified as Broadcast based ? For CSMA/CA a Node sends a broadcast message to notify the other nodes on the ...
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12 views

OSI and TCP/IP models [duplicate]

my name is Alexander. I have problems with English, but I hope you will understand me anyway. I'm preparing for CCNA 200-301 and I have some problems with OSI model. Let me give you a little context. ...
5
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1answer
46 views

IS Network automation kills carries of network Engineers? [closed]

Iam working as network engineer since long time and i enjoying working same . But now i am afraid after listening of network automation .Is network automation kills jobs of network engineer across ...
5
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1answer
23 views

Unable to Communicate from server to other servers after migrating from existing firewall to new firewall

In our existing environment we had migrated old firewall with new firewall after this activity . we had faced connectivity issue . From servers unable to reach other servers . Post clearing ARP table ...
5
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1answer
41 views

For UDP traffic reverse route is required or not

when compared to TCP protocol, UDP is non reliable protocol no knowledgement packet is required for previous packet before sending new packet . so in this case reverse route configuration is required ...
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1answer
47 views

Very confused on this part , two network interface Card(NIC) are configured on server [closed]

i am very much confused on this scenario . This is first time i am seeing two NIC cards are configured for server ,now my query is how to route traffic initiated at server end for NIC interfaces

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