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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Minimum cost flow with bifurcated flow

What can be an efficient solution in order to find minimum cost flow with bifurcated flow based on the topology graph?. Graph is directed consisting of cost and capacity. I already know how to find ...
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1answer
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Is it possible to point a static IP from OVH (or any provider) to a system with a dynamic IP? [closed]

I have a few spare IP addresses from OVH, I'm wondering if it is possible that I can run something on a the server or even my PC (at home) to make the IP address from OVH always point to my routers IP ...
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2answers
14 views

How to find specific device in a network without brute force?

I have an Internet of things (IoT) device with known MAC address, which is connected to a network. First, lets assume that this network is large (subnet 255.255.0.0). Is there any "smart" ...
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19 views

Simple chat program between machines in 2 countries [closed]

I want to get a practical experience in Networking (I have read the basic theory), hence I decided to establish communication between 2 hosts (in different countries) connected to the Internet. This ...
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Networking configuration and submitting [duplicate]

The 131.181.112.0/22 network is provided. a) Determine the number of subnets that can be obtained with that IP address b) Determine the number of available hosts on that network. c) Design 6 subnets ...
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Nat Loopback | Nat Reflection | Nat Hairpin [closed]

I am using beetel 777vr1 , I done the port forwarding with help of friend. Now Issue is i am facing is I can access the website from the outside of network using my public/static IP. But when i try to ...
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1answer
256 views

BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
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When each device on the network has its own IP address why we need data link layer address or MAC address? [duplicate]

I am totally confused about why we need a data link layer when we have a network layer
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1answer
22 views

Connect two places 400 meters away at 10 Gigabit

we are a small media company with 10 gigabit networking using a couple Netgear Switches and CAT6 Ethernet to all the computers in our office. We expanded to a new location recently which is around 400 ...
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8 views

How to develop a new protocol? [closed]

I'm a certified CCNA, web developer and a programmer(I code in Java & python mostly). Although that I understand the concepts of networking I want to expand my knowledge further and code a ...
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Network controller showing 3 different transport id [closed]

There was a problem with my network controller so i opened up cmd and started to check for interfaces. I noticed a strange thing that my Wifi network controller had 3 different Device ID (Transport id'...
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1answer
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Trex not receiving any packets

This is my setup to benchmark my server Diagram Trex version v2.88 Trex server MAC ens2f0: f8:f2:1e:5c:bf:78 ens2f1: f8:f2:1e:5c:bf:79 DUT server MAC eth0: fa:16:3e:1c:be:82 eth1: fa:16:3e:d5:37:b1 ...
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Does all 802.11ax routers include MU-MIMO? [closed]

I'm trying to buy a new router and had a question that I couldn't find anywhere else. Do all 802.11ax routers come with MU-MIMO? How can I tell if a router supports MU-MIMO?
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1answer
105 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
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not able to access my server using public IP [closed]

I am using TP Link router and local internet provider GTPL. I have server on which I am hosting my website but not able to access it using public ip. I am able to access in same lan with local ip like ...
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8 views

How to detect packets using http or other application layer protocols? [closed]

I am writing a program which can detects protocols used in network packets. For every packet receives it will try to detect protocols in layers such network and transport. Detecting protocols in ...
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Open an application with “runas a different user” by passing the username pop-up [closed]

On a windows laptop, when I open Sql Server Management Studio (SSMS) (or any other application like Visual Studio or mstsc [RDP]) as "run as a different user" , a pop-up appears asking for ...
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Online Classes Server Problem [closed]

We have a Super Micro server (112 threads - 512 GB RAM) and we have 4 VMs on it. two are moodle (LMS) and two are Adobe Connect servers. Each LMS is connected to one adobe server (4 IPs). Now we have ...
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Is there any logic to how IP address topology is organized globally? [duplicate]

IP addresses are designed as 4x8 = 32 bit identifiers, 000.000.000.000, representing a hierarchy of organization. Each level in the hierarchy can store 2^8 = 256 networks. In theory, this design can ...
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20 views

Beginner Basics; thank you in advance for your time and kind consideration [duplicate]

If PCs connected across the same broadcast domain can send and receive frames based on the MAC address and do not intend to leave the local area network, then why do they need an IP address? Since IP ...
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3answers
302 views

Where does an access network begin and end?

My book's definition for access network is "a network that physically connects an end system to the first router (also known as the "edge router") on a path from the end system to any ...
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3answers
39 views

One client: static IP vs Static lease DHCP vs. DHCP limited range to 1 slot

I want to attach one client (only 1 maximum) to network router ethernet port. I want to always know the client's IP address, for my port forwarding settings. Using DHCP with range the client IP could ...
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1answer
18 views

Why does CLAT in 464XLAT architecture use Stateless NAT64 instead of Stateful?

As of my understanding, stateless NAT is using 1:1 translation, meaning it needs one IPv4 address for one IPv6 address vice versa, thus not preserving IPv4. Since the CLAT is supposed to be router/...
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Please solve this question [duplicate]

b) An organization is granted the block 211.17.180.0/24. The administrator wants to create 32 subnets. i. Find the subnet mask. ii. Find the number of addresses in each subnet. iii. Find the first ...
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3answers
44 views

What does “terminating incoming connections” mean and what does it imply for network security?

During a recent conversation with a network security team, one of them said: "Look, if that server is terminating incoming connections, it must be in the DMZ." What does it mean to "...
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2answers
50 views

Difference between Reverse Proxy and Port Forwarding

Well both reverse proxy and port forwarding looks for any incoming packets destined to a particular machine which is present in local network. How both of them are different ?
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Cisco ASA 5516-X Wont communicate on inside interface at all. No packets

I'm configuring a brand new ASA and the Firewall refuses to communicate on my inside interface. No matter the traffic type, its denied by implicit deny every time. I was hoping to get some feedback/...
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2answers
165 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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1answer
36 views

Does the first TCP FIN packet (active close) goes with just only FIN bit set?

Suppose we have established TCP connection. The active close process assumes the FIN packet been sent to trigger TCP connection closing. But I can't figure out, is this first (active close) FIN packet ...
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2answers
44 views

Routing infrastructure doubt. It is a functionally design this?

I have design the following network diagram, but I cannot figure out if it could cause some issue on the network: Some detail about the infrastructure: Network connect Ext rtr A, Int rtr B and C is ...
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1answer
23 views

Are there broadcast/collision domains on non-Ethernet networks?

What if we have routers or hosts connected via ATM, Frame Relay, or SONET; that is, what if we have IP over SONET, IP over ATM, IP over Frame Relay, etc., do we still have broadcast domains and ...
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3answers
60 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
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1answer
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Is an extra port opened when accessing localhost:port? [closed]

Imagine a program serves "Hello World" on localhost port 6000. If I visit localhost:6000 in Chrome, is an intermediate port opened to send back the response? From the POV of the server, the ...
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14 views

What is the best way to match packets across pcap files from different capture points? [closed]

I have multiple pcap files which contain data from different capture points in the network. Previously I thought that by using the IP-ID field I can match the packets across the capture files but I ...
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2answers
47 views

Using WAN IP for a host instead

I have a single static public IPv4 address from my ISP. So I understand that i can just forward all traffic using port forwarding to one of my private IPs, but still I am wondering if this is the ...
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2answers
51 views

Congestion control in transport and network layers in TCP/IP

Why do we need congestion control in BOTH the transport layer and network layer in TCP/IP model. Cant we be good enough with control in just one of the layers only? And how do they differ?
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28 views

Ping responses to the Gateway

Last week, I have experienced a strange scenario with Adtran NV3448(a router) and an ISP circuit. Adtran is a similar company like Cisco, also makes networking equipment such as Router, switches, etc. ...
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How does the IPv4 Total Header Length field & Fragmentation work together? [duplicate]

I recently learnt that the maximum value of the IPv4 Total Header Length field is 65,535 which equals approx. 65.5KB. To my understanding, it is different from the IHL field as it includes the ...
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2answers
109 views

What will happen if a server receives a duplicate SYN for an existing connection?

If a server receives a fresh SYN packet for a connection that is already established, what should it do? I have already seen What will happen at server side if it received 2 SYN packet from the same ...
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1answer
37 views

Ethernet Frame visualization

One IP packet is fragmented in multiple ethernet frames at sender's side And at receiver's end, all the frames are combined to get back the IP packet So is there any way to see what payload each ...
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2answers
67 views

Why does IPv6 NS not use unicast address but multicast

This is a follow up of Why not put unicast address in IPv6 packet containing NDP neighbor solicitation instead of solicited-node multicast address? The accepted answer makes no sense. It states the ...
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2answers
29 views

What's the Destination unreachable ICMP packet(ICMP payload the UDP) usage? [closed]

In my Mac(192.168.2.228), it will send ICMP packet to my house's router (192.168.2.1). with the info Destination unreachable (Port unreachable) and in the Wireshark packet detail panel, there ...
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2answers
136 views

Is this UDP diagram wrong?

I was just wondering if anyone can tell me why all UDP diagrams I have seen list a request from the server to the client as the first point of communication? Take a look at the following diagram for ...
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1answer
47 views

How do I properly serialize a network packet [closed]

So I'm currently writing a program that is essentially just a server and a client. The idea is that I want them to be able to communicate with one and other by sending packets back and forth. And I'm ...
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1answer
28 views

Whether the Propagation delay contains the signal from chain into the cache queue?

From the wikipedia: Propagation delay – time for a signal to reach its destination and from the slideplayer.com I found the image: there seems the Propagation delay represent the signal transport ...
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How to find which protocol is used by lower layers? [duplicate]

When we type https://stackoverflow.com/ all the data which is sent to this server would be using HTTPS protocol in transport level So is it possible for me to know which error detection, flow control ...
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1answer
25 views

Why do baseband transmissions use TDM?

To the best of my knowledge, baseband transmissions use (only) time division multiplexing. Why is that so? TDM isn't as efficient as statistical multiplexing. Why is TDM preferred for baseband ...
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1answer
39 views

How can i set up a Wireless LAN to serve 20,000 concurrent devices [closed]

How can i setup a wireless LAN that can serve up to 20,000 concurrent devices. I am having a problem in figuring out if i need one router or several routers. A topology diagram with explanation would ...
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2answers
43 views

List of frequencies that a device can connect to over 2.4 and 5 GHz channels

When connecting to a Wifi on 2.4GHz or 5GHz channel, a device connects on a certain frequency. Is there a somewhere list of all possible frequencies that a device can connect to on a 2.4GHz/5GHz ...
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1answer
49 views

Sequence numbers and wrap around concept

I was reading an article about the topic and I came across this :"During connection establishment each party uses a Random number generator to create initial sequence number (ISN), which is ...

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