Questions tagged [network]

For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.

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High traffic when NAT is configured from firewall side to Internal IP assigned to a certain server [closed]

A server is connected to a server farm switch (interface is Te2/3) and an IP (172.22.4.X) which can be accessed from internal network is assigned to this server. Since the application should be ...
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2GB -> uploading in chunks in parallel vs uploading the whole file in one go [closed]

so, I've been reading quite a lot of article saying that when you upload big file, you need to chunk it in smaller pieces and upload several pieces in parallel, because it's going to be faster ...
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How to add two interfaces to KVM VM acting like a loopback [closed]

I have KVM machine with network interface (say eth0) attached to virbr0, I use it to ssh into the vm. I would like to add two more ethernet interfaces (say eth1 and eth2) and "bridge it on the ...
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Why does the router in the question below not experience any queuing delay, and would their be a queuing delay if one packet was sent out? [closed]

The question is a practice exercise that I am going through and I really want to understand the answer. I am aware that Rc = 1Mbps gives me 0.010 seconds, because 10k bits / 1 Mbps = 0.010 and Rs = 2 ...
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Linux machine running OVS not saving MAC Addresses [closed]

I have an SDN Switch (EdgeCore) running PicaOS and OVS to determine some custom flows. As of now, I want to configure an IP address on a virtual port of the switch for it to be pingable from another ...
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2 answers
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Possibility of transferring data over the same-level networks, rather than the higher-level network

This is a silly(maybe interesting) question. Assume four ASes are connecting to the Tier 1 network(A, B, C and D). B is peering with C and D. A is close to B, but too far from C and D to make peering. ...
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Are data centers of the same company connected with a more stable network infrastructure than the rest of the network globally? [closed]

Let's take AWS as an example. The question is: does AWS different data centers, distributed across a wide geographic area, show a considerably more stable connection, from latency point of view (RTT), ...
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The relationship between AS upstreams, downstreams and peers

I find AS1221 is both the upstream and the peer of AS13445 from ipinfo.io/AS13445. However, as far as I know, there is no upstream or downstream relationship when talking about peering. Is anything ...
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What is the cheapest option for creating a lab for network engineers? [closed]

Hi fellow network engineers I am eager to develop greater networking skills and want to set up the most optimal and cheapest lab environment. For me, virtualisation is the best option for its ...
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Make printer in different subnet accessible to other subnet

i am creating a network and i want the printer which is in a different subnet to be accessible by all other subnets. The router network is 192.168.10.0/24 further subdivided into /28 subnets. The ...
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Are there any ASNs with 0 IP addresses? [duplicate]

Here is the list of all the US ASNs networks ranked by the number of IP addresses: https://ipinfo.io/countries/us However in the page 10, I can see some ASNs with 0 IP addresses: https://ipinfo.io/...
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How does a new switch know how to reach the controller in an SDN?

Let's say we have an existing SDN network composed of several switches and a controller. Now say we connected a new switch to the network. Now how would the new switch know how to reach the controller?...
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Can 2 modems connected to the same router interfere with each other if their web access interface are the same IP address?

Here is information about the network: I have 2 WAN connections to the same ISP which they provided 2 modems for and configured them to be in bridge mode. My MDF router (pfSense) connects both of ...
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Is it possible to assign a default gateway per routing interface on a layer 3 switch

Here is the scenario. Currently there is a flat layer 2 network with a single /24 subnet. The intent is to segment that /24 using a layer 3 switch. On the /24 network there exists clients with ...
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Is there any point to learning about old network address classes anymore? [closed]

It's 2023 and I continue to see people write about IPv4 A,B,C,D, and E networking classes like they still mean something and without saying it's only mentioned for historical purposes. But they are ...
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what will be fast way of finding the live hosts on network?

what will be fastest way to find the live hosts on network. Currently i am finding the live network hosts using arp request and arp response. I have to find these live hosts every second. Is there any ...
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Is TCP used for data transfer after building the routing tables (using OSPF protocol)

I am trying to understand how Data (video, image, ...) is sent over the network, and what are the protocols and different processes involved. We know that OSPF (L3 protocol) does not use TCP or UDP, ...
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Purpose of netmask in dynmic DHCP statement [duplicate]

What is the purpose of the netmask in a dynamic DHCP statement: ip nat pool poolname 209.165.200.226 209.165.200.240 netmask 255.255.255.224 I know, that I should choose the netmask to be larger ...
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100Mbit vs 1Gb/sec transferring 10MB file...speed difference?

Two PC's A and B speed of transfer bits across the wire... 100/Mbit Link (100,000,000 bits) 1Gb/s Link (1,000,000,000 bits) File Size: 10MB (80,000,000 bits) I'm trying to figure out if we have ...
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Does a VPN encryption get stripped from data during cellular transmission?

These phones have all the generations of connectivity but “only use 5G.” On top of that the new GPS Satellite iPhone feature for people that get lost does a VPN protocol work for that, what about ...
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How to obtain a range of IPv4 or IPv6 addresses as an individual

I am building a hobby service that can host user's containerized applications on request. These must be publicly accessible. After some googling I came to conclusion that there is no way around having ...
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Is a ODU connection between two endpoints necessarily bi-directional?

Within an Optical Transport Network (OTN), where two nodes are connected via ODU, is it possible to configure this link uni-directional? I realize this is a very unusual application, but it is an ...
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How to specify the address of the host in IPv4? [duplicate]

Lets say the IPv4 address is: 192.168.50.112 /26 which provides 4 subnets subnet mask: 255.255.255.192 network address 192.168.50.64/26 There are 6 bits left for the Host, how do you specify the host ...
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Complicated bridge between 2 servers [closed]

I have 3 servers: comp_a, comp_b, comp_c comp_a ([eth0 «10.15.14.55»]) 10.0.0.0/8 <———> comp_b ([eth0 «10.15.27.61», eth1 «10.15.26.61»] [eth1 «10.15.26.61» ]) <——VPN IPS (left = 10.15.0.0/16 ...
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Packet tracer is changing my addresses ipv4

Could someone help me with this? I have a subnet with the ip: 172.16.193.0 in the fastethernet 0/0 of my router and when I go to put it in RIP the Packet tracer is changing it for another ip:172.16.0....
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Can SneakerNet Consider As Network?

As the title of the question, is that sneakernet can consider as a network? Or a network is the devices must be connected via cable or wireless?
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trying to ping 192.168.2.2 from 192.168.1.1 pcs

im trying to ping pc2 from pc0 and it doesn't work can anyone help tell me why? pc0 is 192.168.1.1/24 and pc2 is 192.168.2.2/24. The port connecting switch 0 is 192.168.1.100/24 and the port ...
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3 answers
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Does the TCP protocol exist as a process?

Recently, I read "Computer Networks: A Top-Down Approach". I know that applications consist of TCP + a port number. But I keep thinking that if TCP is not a process, it can't handle any task,...
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What command would let me know Which connection links are participating VLAN 2 spanning tree?

Which connection links are participating VLAN 2 spanning tree?
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1 answer
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What stategy use TCP Cubic in Fast Recovery?

I want to do some simulations with different TCP algorithms I was reading one of the earliest papers for TCP CUBIC and I don't see explicitly the strategy of Fast Recovery after a loss of the packet. ...
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1 answer
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Software Defined Networking (SDN): What is line-speed?

I can't understand what is meant by line-speed. From a networking point of view, we can say that line-speed is the number of packets transmitted in a unit of time. I got this term from here: link of ...
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Is this possible? Adding a local device of my home network in client network without firewall configuration at client side (VPN?) [closed]

Let me explain what I want to achieve, but keep in mind that my networking knowledge is limited. I want to login at a clients network to do some remote troubleshooting. And I want to use (for example) ...
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2 answers
125 views

Cannot ping/access single host over VPN [closed]

I am running openVPN server on pfSense machine, which is also the router of the network. This network has several VLAN's, where only single one of them is of interest - 10.0.100.0/22. The openVPN ...
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Is there a word that describes a Port and Protocol combination

I am just looking to see if there is a word that describes a port and protocol combination. In the same way that the word socket refers to a IpAddress and Port combination. Is there a similar term to ...
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Monitor UDP packet in wireshark

I am trying to monitor udp packets from server to client in Wireshark at both end. Can I get any clue in Wireshark with which I find out that ok this specific udp packet is what I sent and received at ...
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How ARP works [Specific Case]?

After reading about ARP and NAT I'm really confused about putting them to work together. Let's suppose we have a router A with a public IP of IP(A). Plus, 2 devices behind that router B and C, each ...
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What does the network layer do at the receiver

My book (Andrew S. Tanenbaum, “Computer Networks”, Fifth Edition.) mentions while explaining the network layer that the key issue with a network layer is determining how packets are routed from ...
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Time synchronization at network Level

Let suppose we have a scenario where we are getting 5G network and its phase and time synchronization for the radio interface is PTP(precision time protocol). Using that 5G network I have my local ...
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1 answer
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Mask for sending network packets

When sending packets in a network, do the PC's all have to share the same subnet mask or can you dedicate comps to mask addresses? I am wondering if this also determines collisions and if it is a ...
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What does "a collection of autonomous computers interconnected by a single technology" exactly mean?

My book (Andrew S. Tanenbaum, “Computer Networks”, Fifth Edition.) takes that as the definition of "Computer Networks". I was able to find out that by autonomous computers, it's referring to ...
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Link utilisation

Studying Packet Switching. Encountered a question - What i know? Packets are transmitted over each communication link at the rate equal to full transmission rate of the link. Router is using Store-...
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Who officially declares cellular network technology?

There are 4 to 5 cellular network technology 1G 2G 3G 4G 5G (upcoming maybe) But who actually defines or officially says that this will be the next cellular technology? which organization or which ...
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In what situation would normal choke packet be preferred over hop-by-hop choke packets?

When the host is far away, it makes sense to use hop-by-hop choke packets to resolve congestion. But is there situations where normal choke packet is more appropriate? And by the 'source' we mean a ...
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Arista vEOS and EVE-NG setup

I have EVE-NG up and running and Have successfully imported an Arista EOS image. Connected a couple of VPCS to it. But I can't seem to get them to ping each other. I did assign IPs to the VPCS for ...
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How does communication between two devices from two different networks work?

Lets say i have a device with private IP address 192.168.1.24 in one network with public IP address 20.156.2.14. Then there is another device with the same private IP address 192.168.1.24 in another ...
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How does NATing work

I'm not 100% understanding how NATing works. Let me setup our network and talk this through. So first of all, lets say that I have an IP size of 4 bits so 16 possible combination. The only private ...
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How many number of bits and hosts? [duplicate]

If it's an IPv4 address and it's in the class B network. Iam supposed to make 20 subnets, what will be my number of bits to consider for the subnet and the number of hosts?
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Test communication of interface using Cat5E loopback

So I need to create a simple process to test a large amount of gigabit network ports. Since I don't want to setup two machines and run software on both the test connection my first thought was to ...
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Relation between the BACnet 4 layers and the TCP/IP 5 layers

How are the BACnet 4 layers (physical, data link, network, application), related to the TCP/IP 5 layers (physical, data link, network, transport, application)? Are they separate of them, or build on ...
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why is the length same with the MSS value? [duplicate]

I have read this I have issue with MSS and window size and what is difference between MSS and Window Size? I'm confused. I have a setup like this: my host machine (Macbook) and a virtual machine (...
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