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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Does sending packet to machine in local network broadcasts or uses router [closed]

If I have 3 machines in a local network let's say A, B and C. Now A wants to send some data to B. Now, A needs to know the IP and the MAC of B. For simplicity, let's assume IP of B is known. a) To ...
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1 answer
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Network configuration for isolated subnetwork with Internet Access

I have been tasked with helping set up a subnetwork for my office, and due to limited experience with networking, wanted to get suggestions / recommendations for the best way to do this based on our ...
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how can I solve a closed network connection problem? [closed]

recently i bought a germany vps server to ceate my own VPN using v2ray because I live in iran and the internet is heavily censored here, I connected my domain to cloudflare cdn to avoid my actualt ...
1 vote
1 answer
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Recognizing the next protocol in MPLS header

How can I know what is the next protocol in MPLS header? I do know that MPLS header does not provide any information about the next protocol, But I somehow need to know how to recognize it, as I am ...
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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
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1 answer
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How can I ensure that NAT hairpinning goes through the gateway?

When I enable NAT hairpinning, will accessing LAN devices through the public IP go through the public network? After enabling NAT hairpinning and establishing a TCP connection, if the public IP ...
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1 answer
228 views

Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
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3 answers
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Is there a difference between NetID and Network Address?

So i know the gist of it. Thanks to the help here Network Address i see as anything ending with 0 Example: 192.168.0.0 Broadcast Address i see as anything ending with 255 Example: 192.168.0.255 ...
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1 answer
511 views

Ping to default gateway failing

I am trying to ping to a default gateway which i have configured as 171.2.0.1 but somehow the ping is failing . I am new to network domain so i have less idea about it . Any help is appreciated .This ...
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2 answers
597 views

Copper or Glass for Low Latency?

I'd like to preface the main content of this post with the following: I understand this question may be equally suited to the Physics Stack Exchange, and so I have posted on there as well, but maybe a ...
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1 answer
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Communicating Between Two Devices When One Lacks Internet Access

I am currently developing a software that needs to establish communication between two devices. Device 1 has internet capabilities, while device 2 may not always have internet access. I am ...
2 votes
2 answers
61 views

what information needs a router to make a decision?

How does a router that receives a packet know what to do if it doesn’t know the subnet mask of the IP that sent the packet? The reason for asking this is that I didn't see any field in the IP header ...
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4 answers
389 views

Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
1 vote
3 answers
193 views

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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2 answers
230 views

How can i optimize this network

I got a router on a stick and I want to optimize it by reducing its cost and also the configuration costs This topology is to facilitate inter Vlan routing so Vlan1 can communicate with Vlan2. PC0 and ...
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1 answer
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Option Field In TCP Header

In the tcp field option There are several options that can be added for example like mss But how if i don't use the SACK option, what kind of acknolegdment will I use cummulative?
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1 answer
377 views

How FDB (Filtering Database) is filled out

I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs? We can represent the ...
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1 answer
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Are WAN same as autonomous systems(AS)?

I am currently studying network+. I came across this question that are autonomous systems(AS) same as the WAN ? or they are two things completely apart?
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1 answer
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What is optical network coding? which techniques are there?

in optical network, what is network coding and which techniques are? is modulation a techniques of network coding?
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1 answer
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HP 6120XG switch LACP is blocked - error condition

Folks, I am dealing with very strange issue related LACP and not sure if its bug of 6120XG switch or something else. so let me explain my issue here. Network Diagram: I have two Cisco Nexus 9396PX ...
2 votes
1 answer
134 views

6125XLG blade switch IRF configuration in c7000 chassis

I have HPE c7000 chassis with 612XLG switches. I am trying to setup IRF between blades switches. somehow i am not able to bring up irf-port interface. In 6125XGL TE1/0/17-20 ports are internal ...
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2 answers
59 views

How to connect HP 2930-8g to the cisco CBS350-8g switch unmanaged?

I want to Connect HP 2920-8g to CISCO CBS350-8g. I tried HP sfp ( J4859D ) in HP and CISCO working fine, with HP and Cisco switch and cico sfp (MGBLX1) and programmed switch(config)# allow-...
1 vote
1 answer
51 views

Reverse ARP In Data Link Layer

In the arp the Mac address is used as a broadcast address with a value FF:FF:FF:FF:FF:FF as the destination hardware address. But What about reverse ARP broadcast address? Which broadcast address ...
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0 answers
18 views

What RFC standards That describe how network headers work at the bit level [duplicate]

I want to understand more deeply how network headers are constructed at the bit level based on byte ordering, but what standard RFC number explains this?
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Is there a way to gather data of Optical Module Status and the CPU Utilization through SNMP protocol?

When using the snmpwalk command to query a Cisco SF302-08PP switch with the -c public community string, am not able to find data related to Optical Module Status and CPU Utilization. I am trying to ...
3 votes
1 answer
419 views

Understanding Header Structure in Binary

How headers are actually structured at the bit level let's take the TCP header as an example |src port | dst port | Sequence Number Then how are the three header fields actually structured at the bit ...
1 vote
1 answer
292 views

Multiple GRE tunnels towards single host using anycast IP

I'm trying to build the following network architecture: Where clients try to connect to a backend server (e.g. SSH) by using a Public Anycast IP adddress (1.2.3.4), that routes the client to the ...
1 vote
1 answer
86 views

Can an application on two separate devices share a packet to similar resource?

Can packets requested for an image by an app on a phone be sent to same app on another phone by another user?
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2 answers
127 views

Difference between SDN and Network Automation

What is the difference between Software-Defined Networking and Network Automation? If you are managing your routers and switches using tools like Puppet or Ansible, or by using bash scripts or python ...
1 vote
1 answer
45 views

TCP Multiple Segment Acknolegdement

Let's take example where in the example i will use the Independent acknowledgment. Host A has send segment 1,2,3 to the host B, after host b receive each segment it will send a Acknolegdement for each ...
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1 answer
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TCP Duplicate Acknowledgement

Host A and Host B has establish the connection, Host A will send a segment 1,2,3,4,5,6 but segment number 2 and 5 is lost. Then the receiver will sending an duplicate ACK to sender, so whenever sender ...
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1 answer
39 views

Reset Connection With RST Flag TCP

When a connection has been established between Host A and Host b, Then there is data exchange between host A and host b,Let's say host A already has 3 segments, segments 1 and 2 have been sent and ...
1 vote
1 answer
29 views

TCP Header Data Field

In TCP header there was a field called a data field which stores data, but does this field store the IPv4 header + datagram or just the datagram?
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1 answer
38 views

Layer 2 Encapsulation and Decapsulation in Router

Whenever the router receive a packet from the local network, router will decapsulate the frame to be able access the IP information, after router have done know which interface it will send the data ...
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2 answers
1k views

Does MTU setting affect sending, receiving, or both?

Consider the two devices: A: PC, NIC MTU is set to 1500 B: Router, MTU of relevant interface is 1478 Now if A sends a frame of length 1500 to B, something might go wrong. But what if I set A 's MTU to ...
2 votes
3 answers
433 views

Switches in chain topology for ~40 devices

I am currently looking at a network topology consisting of ~40 DUTs. In this network, there is no hierarchy (like access core and distribution), and all the switches are connected in chain topology. ...
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1 answer
37 views

What happens when the sender sends more data then the advertised window by the receiver?

I am relatively new to networking. I am doubting what happens when the sender sends more data than the advertised window by the receiver. I mean that the receiver advertises the window size based of ...
1 vote
1 answer
76 views

Would a /24 public ip range typically be from the same country?

Would a /24 public ip range typically be from the same country? This to reduce the amount of ipstack requests, checking from what country an IP is. (due to bot requests)
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0 answers
45 views

TCP blocked until the acknowledgment received

I am currently facing an issue in my application where the TCP messages seem to be blocked until an acknowledgment received. Specifically, the subsequent messages wait for the acknowledgment of the ...
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2 answers
75 views

Setting up a local network with access to the internet through a wireless access point

Intro At work we want to setup an 8 node raspberry pi cluster. The purpose of the cluster is to test different technologies and have a good time. We cant manage the wifi at work and the only way we ...
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1 answer
134 views

IPerf test| Server side Sender data shows that the bandwidth is zero but Client has bandwidth of 125 Mbps

I conducted Iperf3 test on my network. I received in server side that sender transfer bandwidth is zero but Client side showed a bandwidth of 125 Mbps. What went wrong? The command I wrote was Iperf3 -...
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1 answer
58 views

Network exposure function in 5G core network [closed]

I want to integrate Network exposure function(NEF) to another core network functions . Is their any one help me how to do that?
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2 answers
141 views

Setting FortiGate HA Firewall

I need some advice and guidance regarding setting up the FortiGate HA, My question is focused on WAN side of configuration (not A WAN expert), below are highlight environment 2 ISP WAN-A / WAN-B ...
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2 answers
88 views

Multiple computers disconnect from the network randomly at mostly random times; only fixed by renewing IP

I have recently been made the IT administrator in our organization. We have in-house servers; DNS, Windows Authentication, etc, and we have 2 switches with around 25 computers and devices connected to ...
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1 answer
166 views

Design of 2 Lans Connected to a Watchguard m570 firewall

I have this architecture (without the firewall). I bought a Watchguard M570 as Firewall to add it in my network. My Question is : Could i use my watchguard and connect this one to my 2 LoadBlancers ...
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1 answer
60 views

How make a local network to a wide network like internet?

I have a software that installed on computer number 1 (as a server with local address 192.168.1.11), so two other computers can work with it on a local network (a modem). In other words, on two other ...
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1 answer
42 views

Protect public network with virtual firewall w/o control over the gateway

I have a public network, 123.123.123.0/28, and a local network, 192.168.1.0/24. My ISP gateway for the public network is 123.123.123.1. My virtual firewall and router (pfsense) is running inside ...
7 votes
2 answers
4k views

The best way to understand Vlans?

Every time i try reading about the configuration of a device and adding it to the network, i always face a problem. The problem is basically am not able to understand Vlan's, and how for example some ...
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0 answers
128 views

How to remove switchport switchport general allowed from Dell n2048

how to remove switchport general allowed vlan remove 1 from dell n2048 interface Gi1/0/1 switchport general allowed vlan remove 1 exit what command for switchport general allowed vlan remove 1
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1 answer
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Cannot enable link. Why?

I have the following setup: I'm unable to enable Fa0/5. The switch configuration for that port is correct No configuration has been made on the server side: Assigning Ip adresses has not solved the ...

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