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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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Connect PC to HVAC Router

I have a network with multiple Cisco 9300 Switches and 9606 Core switches. We had a PC connected directly to a Carrier i-Vu XT Router. The PC needs to be moved to another building. I connected the ...
Rick151's user avatar
  • 21
0 votes
1 answer
52 views

Why is IPsec transport mode "vulnerable" for not having integrity of variable fields? Why is this so important?

With IPsec transport mode we CAN'T have integrity of variable fields (eg TTL and checksum). Why is it a problem? Is it? What could be the attack? I think TTL expire or checksum modification (so both ...
allexj's user avatar
  • 1
0 votes
1 answer
73 views

Struggling to configure VLAN properly (LANCOM, no internet)

I'm currently trying to configure several port-based VLANs for guest rooms, but I'm either not getting any network connection or no internet access depending on what I configure. There are several ...
ImanityDev's user avatar
0 votes
1 answer
43 views

Do LACP uplinks need to be able to communicate?

I am configuring a WAN connection that utilizes Virtual Router Redundancy Protocol (VRRP) and involves two uplinks. My goal is to connect these uplinks to two firewalls set up in an active-backup high ...
kevin's user avatar
  • 23
1 vote
1 answer
52 views

What exactly is the ASPATH in data analyzed by BGPdump

I apologise in advance I don't specialize in computer networks, but my tutor gave me this urgent task to analyze some raw data obtained from RIPE. So basically I find a tool recommended by RIPE on ...
Lackind's user avatar
  • 11
1 vote
1 answer
74 views

Network Design: Daisy Chaining vs One Centralized Switch

I am curious as to what the "standard" is when it comes to designing a network with the given constraints:\ cable runs would be more than what cat5e/6 would allow without a repeater\ one ...
Noah A Barcomb's user avatar
2 votes
3 answers
77 views

Core Switches Redundancy Problem

I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
shiva13's user avatar
  • 25
1 vote
1 answer
61 views

Cisco BGP RTBH in EVPN fabric

I have Cisco basic EVPN fabric configuration in DC with two spine and couple of leafs using OSFP+iBGP for underlay fabric. My border leaf connected to my ISP using Vrf CUST. I want to configure RTBH ...
Satish's user avatar
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0 votes
1 answer
53 views

Cisco nexus C93180YC-EX sflow configuration

I am running cisco nexus C93180YC-EX switch and I would like to enable sflow for collector. I did similar config on 9396PX model and it works but Nexus 93180 is little different. I am running NXOS 9.3....
Satish's user avatar
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1 vote
1 answer
65 views

should I go multiple switch or one big switch

So I have a 2.5Gbps NIC on my server PC, but my main questions are: note: I'm using consumer grade switches will a 2.5Gbps switch split the load with two 1 Gbps switch? will the 1Gbps be better on ...
randomaire's user avatar
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0 answers
20 views

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 ...
Santiago Mercante's user avatar
0 votes
1 answer
53 views

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 ...
ishunsei's user avatar
0 votes
3 answers
67 views

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 ...
Lars's user avatar
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0 votes
1 answer
37 views

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 ...
FledDev's user avatar
  • 103
2 votes
2 answers
69 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 ...
netuser2024's user avatar
1 vote
1 answer
61 views

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?
Mohammad's user avatar
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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?
onxy tzy's user avatar
0 votes
0 answers
72 views

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 ...
mema's user avatar
  • 11
3 votes
1 answer
428 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 ...
Hanzo Mortal_kombat's user avatar
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 ...
Apabila X Terkadang's user avatar
1 vote
1 answer
59 views

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?
Apabila X Terkadang's user avatar
1 vote
1 answer
50 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 ...
Apabila X Terkadang's user avatar
0 votes
1 answer
87 views

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 ...
Apabila X Terkadang's user avatar
0 votes
1 answer
52 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 ...
Apabila X Terkadang's user avatar
1 vote
1 answer
34 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?
Darevil294's user avatar
0 votes
1 answer
43 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 ...
Darevil294's user avatar
0 votes
1 answer
79 views

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?
user id's user avatar
0 votes
1 answer
45 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 ...
Ayush Gupta's user avatar
1 vote
1 answer
78 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)
MichaelD's user avatar
  • 113
0 votes
0 answers
46 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 ...
myprogramistoobusywitherrors's user avatar
0 votes
1 answer
275 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 -...
Finny Joseph's user avatar
0 votes
2 answers
185 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 ...
KurdTech's user avatar
0 votes
2 answers
91 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 ...
Alexander Davis's user avatar
0 votes
2 answers
175 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 ...
Noob_Guy's user avatar
  • 491
0 votes
1 answer
64 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 ...
Ali Esmailpor's user avatar
-1 votes
2 answers
82 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 ...
Christopher Brøndholt's user avatar
0 votes
1 answer
43 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 ...
Demiler's user avatar
0 votes
0 answers
226 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
EKA PRASETYO PUTRA's user avatar
0 votes
1 answer
76 views

Geolocation specific ASN

question: is it possible to determine the geolocation of a city/region of a specific ASN? For example, Telecom Italia has many ASNs. Is it possible to know for each one "which soil" they ...
vincenzogianfelice's user avatar
0 votes
1 answer
97 views

Outgrowing a /24 network

We have outgrown our 192.168.1.0/24 network. We are ready to replace the router so I thought this would be a good time to expand the network. I've configured plenty of /24 networks but never anything ...
Jeff's user avatar
  • 103
0 votes
2 answers
84 views

How to interpret traceroute results? [duplicate]

So, I have a task which involves calculating the RTT to a destination. Now, I have done it using ping. But, I need to do it using traceroute too. From, my knowledge about traceroute, I know that it ...
Vedanta Mohapatra's user avatar
0 votes
0 answers
39 views

2 Cisco ASA Firewalls - TCP SYN FLOOD

Problem We have 2 firewalls, a DMZ firewall and another firewall named FW1 in a testlab. Both are CISCO ASAs. The shared services and jumphost are behind the FW1 firewall. The 172.28.208.0/24 subnets ...
Kal's user avatar
  • 1
0 votes
1 answer
90 views

Get all reachable IP addresses within a private network [closed]

Is there a way to get all reachable IP addresses within a private network. I know that we can get all active devices' IP addresses within same subnet using arp. I was wondering if something similar ...
Atharwa Adawdakar's user avatar
1 vote
1 answer
581 views

How to use 5 static ip addresses with virgin media broad band

I have installed virgin media business broadband and the package comes with 5 static ips. These IP are GRE tunnels from the HITRON router to virgin. the IP addresses are for example 66.66.66.65 - 66....
funkimunky's user avatar
0 votes
1 answer
42 views

Simple question about NAT [duplicate]

So I am learning about NAT. I understand that it changes IP from public>private and vice versa. From my understanding, when a packet or info gets sent to the public ip towards the private ip, ...
yea im a noob's user avatar
0 votes
0 answers
16 views

What is the practical use of bandwidth-delay product? [duplicate]

It's given that the bandwidth-delay product defines the number of bits that can fill the link; while the sender can send (1+(2 * Propagation Time / Transmission Time)) units before getting ...
SUNITA GUPTA's user avatar
0 votes
0 answers
21 views

Just testing a 2 pair twisted internet cable having 4 wires [duplicate]

I am having a problem with my 2-pair ethernet cable. I have connected the 4th, 5th, 7th, and 8th pins, but the 4th pin is not working. I have checked the RJ45 connector and the cable with a multimeter,...
Zohaib Khan's user avatar
0 votes
0 answers
97 views

How to handle routing with overlapping ranges as general concept?

An existing network managed by a 3rd party contains routers of the same subnet (in this case 192.168.0.0/24) and is connected to a central infrastructure using a VPN tunnel. All connections are force ...
muffel's user avatar
  • 101
0 votes
1 answer
78 views

No access to internet via DHCP, but works with manual IPs

My DHCP server was giving out IPs in the range 10.0.0.1/24, but I ran out of usable IPs, so I changed the subnet to 10.0.1/21 to have more available addresses, however I am now having a weird problem: ...
Mike's user avatar
  • 133
0 votes
2 answers
886 views

Simulating Network Infrastructure on GNS3: Switch Stacks and Configuration Challenges

I'm seeking guidance on simulating a network infrastructure using GNS3, specifically focusing on the challenges related to switch stacks. The network environment consists of multiple physical switches ...
wajaap's user avatar
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