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.
854
questions
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9
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Fake Base Station [closed]
I am doing my research about how to find a fake base station using machine learning. I captured features like 'Packet number',' Size (B)',' Layers',' Packet Information Summary', and ' Time Difference ...
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0
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13
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Broadcast Leakage across VLANs for DHCP with pfSense and Ubiquity equipment? [closed]
One of the clients I work with uses a pfSense system and Ubiquity hardware to power their separate unattributed research lines, but still have it set up as a standard Enterprise grade network. This ...
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0
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6
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Expose pdf printer on computer as a network printer [closed]
If I have a printer on another computer. How can I expose that printer as a real printer on the network so that if someone prints to it, it will save as a pdf.
If this is not possible, is there a ...
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0
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15
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why WEP isnt secure [closed]
i just want to make sure what i know is correct about why WEP isnt secure. when a client wants to send data to AP using WEP, the WEP key(which is the password the user uses to connect to wifi-so this ...
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0
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10
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Can a packet switch connect directly with another packet switch? [closed]
Can we interconnect multiple packet switches together or we always need a router for that? If its possible, what are the advantages/disadvantages of both approaches?
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1
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58
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IP MTU and Interface MTU
So im facing a problem with understanding which MTU(ip MTU or interface MTU) is the one responsible for fragmentation. I know that ip MTU is at layer3 and interface MTU is at layer 2.just an example: ...
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0
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13
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Subneting in IPv4 Networking [duplicate]
How do I divide 198.162.17.0 /24 into 2 subnets?
Please show your workings to enable me understand it properly
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1
answer
38
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How to calculate or specify these terms Throughput, Data rate, Bandwidth? [duplicate]
The term "throughput" clearly refers to the actual data received in a system. For instance, with a bandwidth of 5MHz and a channel capacity (data rate) of 10Mbps, if the received data is ...
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2
answers
112
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10Base-T Half Duplex Segment Length 100m?
Considering 10Base-T Half Duplex...
Is the maximum segment length of 100m a timing constraint (from CSMA/CD)?
Is it derived from the slot time / minimum packet size?
Or is it an electrical performance ...
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0
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2
answers
63
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Need Help on Designing Network in Warehouse
I need help on finalizing the Network Scheme for a Warehouse.
Current System has 2 different ISP with total 6 wifi access point for 3 each since it's large Warehouse
Each ISP has 3 WiFi access points ...
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0
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38
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TCP Retransmission testing tool
I'm setting up two Linux agents (based on Debian) to test TCP retransmission patterns using iperf3. The output looks like this:
# iperf3 -c 172.16.2.11 -p 5010 -t 5 -b 10M
Connecting to host 172.16.2....
0
votes
1
answer
28
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Why the growth is exponential in Slow-start-phase (congestion control) even when we increase window size by only 1MSS with each ACK received [duplicate]
I want to know why do we consider congestion window size increase as exponential even though we are increasing it by only 1MSS at each ACK received (Transport Layer).
I have learned that in Congestion ...
1
vote
1
answer
34
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What is expected behavior when pinging DHCP-PD prefix?
I get a DHCP-PD prefix from ISP and I'm using dynv6 to be able to have dns-entries for my hosts using just the prefix and mac-address for the SLAAC IPv6 address.
https://dynv6.com/
I have a small ...
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0
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13
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can DHCP server Detect type of windows? [duplicate]
I have a DHCP server and several clients, some running Windows 10 and some Windows 7. I want the DHCP server to be able to identify the Windows version of the clients using the vendor class and assign ...
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0
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6
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i want to know how to calculate any ip adress for a given nth subnet [duplicate]
your company requested and received the network address 197.20.2.0. For reasons related to its organization, you want to have 24 usable subnetworks
a. what will be the value of the subnet mask?
b. ...
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1
vote
1
answer
34
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Inner header and Outer header in tunnel packet
What should be at Inner header and Outer header in tunnel packet ?
And then we have tunnel IP address(for both router), tunnel source IP address, tunnel destination IP address.
In my understanding, ...
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0
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75
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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 ...
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1
answer
63
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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 ...
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0
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1
answer
113
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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 ...
1
vote
1
answer
68
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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 ...
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1
answer
61
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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 ...
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1
vote
1
answer
140
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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 ...
2
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3
answers
93
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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 ...
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1
answer
85
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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 ...
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1
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85
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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....
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1
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1
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109
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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 ...
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0
votes
0
answers
30
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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 ...
0
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1
answer
59
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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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3
answers
104
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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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0
votes
1
answer
41
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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 ...
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2
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2
answers
75
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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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vote
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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0
answers
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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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0
answers
77
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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 ...
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3
votes
1
answer
440
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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 ...
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vote
1
answer
53
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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 ...
1
vote
1
answer
78
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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?
1
vote
1
answer
61
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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 ...
0
votes
1
answer
126
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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 ...
0
votes
1
answer
70
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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
38
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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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0
votes
1
answer
56
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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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0
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1
answer
106
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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
90
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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
89
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
52
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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 ...
0
votes
1
answer
491
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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 -...
0
votes
2
answers
282
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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0
votes
2
answers
94
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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 ...
0
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2
answers
231
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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 ...
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