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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I want to get a network engineering internship. What should I do? [closed]

I'm in community college pursuing an AS in cybersecurity. I'm taking networking classes and studying CCNA on Cisco Networking Academy. I'm interested in obtaining a networking/network security ...
Audrey W.'s user avatar
0 votes
1 answer
44 views

How is network virtualization useful?

I am trying to understand various virtualization techniques, and I am struggling to wrap my head around the concept of Network Virtualization. I don't have a networking background(mostly programming). ...
Max's user avatar
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Does starlink offer a Public IP Address that not dynamic IP? [closed]

I would like to know if starlink offers a public IP that is not dynamic (or will not change forever), We are planning to have a mobile server that will travel across regions. Any answers will be ...
Josh's user avatar
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EVE-NG doesn't run any nodes other than VPC and vIOS devices

I'm running a Community edition of EVE-NG on a nested virtualization setup but cannot run any of the "real" images in the lab. It's just the virtual PCs and Cisco vIOS devices that seem to ...
Sylar's user avatar
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2 answers
31 views

Need to design a network for a medium size business with wireless and wired connections [closed]

I need help in designing a network for a 100-room hotel where all the guests require internet access. We also have business desktops that require wired connections in our offices. I need guidelines on ...
Qaiser Wali's user avatar
1 vote
1 answer
35 views

IPSec Site to Site VPN Connected but Subnets not Routing [closed]

Re: Creating a site to site vpn from ubuntu 22 + strongswan to cisco meraki Issue: I've established a vpn tunnel but routing between clients on the network is not working. meraki config: Non-Meraki ...
Matt Campbell's user avatar
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1 answer
49 views

Limit on how many times on converting fiber to copper vice versa

I need to run data through single mode fiber (1.5km) to connect to a remote site. I have to cross a road that has a copper data cable run underneath it. (cat5e) The local authority doesn't allow me to ...
Bob Smith's user avatar
-1 votes
0 answers
12 views

Huawei AR2200 for failover [duplicate]

Huawei AR2200 for redundancy How can I configure a Huawei router, AR2200 for failover between two uplinks from the same ISPs, considering fast failover?
ambaw adisu's user avatar
1 vote
1 answer
91 views

routers and the HDLC protocol

I'm training in computer networks, I hope my question won't be stupid... Are routers involved in the HDLC protocol, and therefore at layer 2 of the OSI model? I always thought that routers only ...
Ali's user avatar
  • 33
-1 votes
2 answers
71 views

Why is inter-VLAN communication not working in my network set-up in Cisco Packet Tracer?

I have created a simple bus topology connecting 2 switches and a router, with each switch connected to their respective end devices through ordinary star topology. The switch model used was 3560-24PS ...
Trineshen's user avatar
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2 answers
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Do destination hosts decrement the TTL?

I was trying to understand more about traceroute when I stumbled upon this site and I have a question about this diagram: As you can see in the diagram, the destination host S1 receives a packet ...
Noob_Guy's user avatar
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In a trace route, do routers that do not respond still forward the packets?

In traceroute, The sender expects a reply within a specified number of seconds. If a packet is not acknowledged within the expected interval, an asterisk is displayed. Pasting here the example trace ...
Noob_Guy's user avatar
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1 answer
38 views

What device to use as an intermediary " Wifi Router" for a subnet, plug-and-play architecture?

I am new to network architecture so I apologize in advance for any nomenclature errors. I have 50 IoT devices (running Ubuntu) that I want to stream significant data from. These devices are only ...
Michael Kaca's user avatar
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0 answers
16 views

Identification field in ipv4 [duplicate]

What is the actual use of identification field in ipv4 and also does the same fragment packet Will share the same identification value
Darevil294's user avatar
1 vote
1 answer
41 views

Does PPP do broadcasting? [duplicate]

Let's consider the scenario below: Router 1 <---> Router 2 <---> Router 3 Routers 1 and 3 establish a link with router 2, then will Router 2 broadcast to the interface connected to routers ...
Darevil294's user avatar
3 votes
1 answer
95 views

Address Field In PPP Protocol

What is the actual use of the Address Field on PPP As I know, it is always set to 11111111 and this doesn't seem to have any purpose because we use ppp we dealing with the direct link communication
Darevil294'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
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 ...
Hanzo Mortal_kombat's user avatar
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End to end delay over N link including the (simplified) propagation delay

It is well know (see this question) and easily verifiable that end-to-end delay in case of trasmission of P packets of size L over N equal links (same transmission rate R) with zero propagation delay ...
frhack's user avatar
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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
0 votes
1 answer
40 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
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 ...
Apabila X Terkadang's user avatar
0 votes
1 answer
63 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
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 ...
Apabila X Terkadang's user avatar
1 vote
1 answer
28 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
2 answers
120 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
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0 answers
20 views

Which of the 'Variable Length Subnet Masking technique' is correct and most useful for most users? [duplicate]

Method 1: Major Network: 192.168.1.0/24 Available IP addresses in major network: 254 Number of IP addresses needed: 27 Available IP addresses in allocated subnets: 229 About 10.55% of available major ...
M.K.Dan's user avatar
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0 answers
18 views

how to calculate the udp checksum when the udp payload is and odd number e.g 45 bytes payload [duplicate]

I am new to networking and was learning about the UDP Protocol and i came through the term UDP checksum. I searched the internet spent so much time finding the correct way to calculate the UDP ...
Immad's user avatar
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0 votes
1 answer
429 views

Why am I not capturing any ICMP packets on wireshark?

I am doing a lab where we are meant to ping an address and use wireshark to capture ICMP packets when we ping that address. WHen I run the wireshark capture with the ICMP filter on and ping my address,...
Garrett LaCoste's user avatar
0 votes
1 answer
65 views

Can propagation speed be measured in bits per second?

In networking, propagation speed is usually measured in meters per second. If we knew how many bits fit in a meter we could multiply these values and end up with a measurement in bits per second. Does ...
Nick's user avatar
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1 vote
1 answer
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Wrong subnet configuration works anyway in a shared bus, but doesn't work in switched lan. Why?

I was told that this configuration (which contains an error in DNS mask which is /23 instead of /24) works only because it's a SHARED bus. If it was a SWITCHED lan, the DNS responses from DNS to A ...
Allexj's user avatar
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2 answers
69 views

Configuring connectivity between device on LAN to WAN on Fortigate 80e

Good day all, I am running into some trouble trying to get a device behind a fortigate 80e on the LAN to talk to a device on the WAN at one of our remote sites Background MQTT Device: 192.168.10.240 ...
cnrdvdsmt's user avatar
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0 answers
35 views

Need assistance with Cisco Firepower 5516X: Excluding a single IP from a specific Snort rule

I'm currently managing a Cisco Firepower 5516X device and have encountered a false positive for a specific Snort rule. Instead of disabling the rule for all traffic, I would like to selectively ...
Hsn Sah's user avatar
2 votes
2 answers
631 views

Can LACP connect to 2 different firewalls?

I'm in the process of redesigning my network and have a few questions about LACP configuration: Can LACP be set up to connect to two different firewalls? In the diagram I provided, there are three ...
kevin's user avatar
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0 votes
2 answers
51 views

What are the best practices for troubleshooting and improving the efficiency of file transfers between computers on a local network?" [closed]

What are the best practices for troubleshooting and improving the efficiency of file transfers between computers on a local network?"
Prasanthi's user avatar
1 vote
2 answers
116 views

Understanding VLAN Tagging for Network Segmentation

I've been reading up on network segmentation and the use of VLANs to enhance security and network management. However, I'm still a bit unclear about the concept of VLAN tagging. Can someone please ...
Mahesh's user avatar
  • 11
0 votes
2 answers
69 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
1 vote
1 answer
59 views

Connecting and combining 2 networks

I have networks in 2 separate buildings. Each has its own private IP range. We're installing a private fiber link between the two buildings. Do I just need to adjust the subnet mask so they can see ...
Gary Hanna's user avatar
0 votes
0 answers
36 views

Why NETCONF standard distinguishes YANG models and configurations?

I'm not a professional network engineer and have poor experience with NETCONF. Could you please explain to me why standard requires two different files with different extensions (xml/json and yang) to ...
Nabla's user avatar
  • 1
0 votes
2 answers
50 views

How does OSPF sense the physical media?

For different physical media types, OSPF behaves differently about electing a Designated Router or not. For example, non-multiaccess media links such as serial Point to Point do not need election for ...
petar_georgiev'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
1 answer
140 views

Basic Networking - IP address

guys, I am currently going through basic networking concepts... There is this piece of information: 'Briefly, an IP address (or Internet Protocol) address can be used as a way of identifying a host on ...
Jan's user avatar
  • 1
0 votes
1 answer
75 views

SDWAN Control Plane Bandwidth limiting

I have an Cisco SDWAN network and my edge devices MUST not exceed a specific bandwidth/rate for the given transport. I can create policing/QoS polices for the data-plane. As for the control-plane, ...
CyberdyneStaff's user avatar
1 vote
1 answer
163 views

Communication between hosts on different local networks

I understand how NAT works in case of communication between one, local host and a server with specific public IP address. The host is sending a request, it pushes the packet with destination IP ...
Bratw's user avatar
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0 votes
0 answers
17 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
2 answers
109 views

Communication with different subnet masks

So I try to explain the dilemma. I have 2 groups of clients and one server. I want these groups to only communicate with the server. This means that each device in these groups should see the server, ...
nub's user avatar
  • 1
0 votes
1 answer
537 views

CISCO 9800-L Controller internal dhcp not working - GUEST WIFI

I have been trying to configure a guest network for my Cisco Catalyst 9800-L Wireless Controller for some days now. For the guest network, i want it to use an internal dhcp on the controller. I have ...
Amarnauth Persaud's user avatar
0 votes
1 answer
58 views

IPSec over L2GRE scenario

I wanted to know if this is a valid scenario and if it is possible to implement. There is a remote site A. and a Data center site B. Both A and B have a edge router which runs an IPSec tunnel. An ...
RootPhoenix's user avatar
13 votes
1 answer
3k views

Why in TCP the first data packet is sent with "sequence number = initial sequence number + 1" instead of "sequence number = initial sequence number"?

In the 3-way handshake, the initial sequence number of both endpoints of the TCP connection is synchronized. Here is an example: Endpoint A randomly generates an initial sequence number: 123. ...
ilBarra's user avatar
  • 241
1 vote
2 answers
324 views

Brocade 7450 - set MTU to 9000

I have brocade icx 7450. I already enabled jumbo frames to increase MTU packets on switch. But unfortunately I am not able to change MTU size of port which I want. When typing after choosing interface ...
Frihu's user avatar
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