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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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13 views

Dhcp authoritative problem [on hold]

I can't set the dhcp from non authoritative mode in authoritative mode,does anyone know how to do, since when I move a pc from one vlan to another, this keeps the address of the old vlan. I have ...
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9 views

How to manipulate packets for Adversarial Machine Learning in order to change network classification results? [on hold]

I am working on Adversarial Machine Learning. This means we have malicious input in order to get an inaccurate classification of the packet i.e. the packet will be classified with an incorrect label. ...
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8 views

QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward [on hold]

Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration ...
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17 views

What the Difference between port triggering and port forwarding in a router? [on hold]

What the Difference between port triggering and port forwarding in a router? I've used port forwarding for using SSH over the internet. Kindly tell the purpose of port triggering.
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How to generate dataset using cooja simulation software [closed]

how can i obtain dataset which consist of information about network connections by using cooja simulator by creating network of iot devices and simulation of various cyber attacks on them.
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12 views

Domain Controller for Windows and Linux Endpoints [closed]

For a small company that has Windows and Linux endpoints, I'm trying to create a DC that will enforce group policy. The GP is meant to increase the security at the network by enforcing the users to ...
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1answer
18 views

How bandwidth is divided in a network? [closed]

so given a certain bandwidth how is this bandwidth for a specific link divided when different links sprout out of a single link? Is it equally divided or it there a better optimal way? Also, this ...
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7 views

How to find Header length and total length with 8-bit inputs in IP datagrams [closed]

this is my first time posting here, so i apologize in advance if i do something wrong. Basically, I'm doing a bit of networking homework and i reached a roadblock. I'm unsure about the math that i ...
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14 views

Engineering a solution for two companies to share a large amount of data regularly [closed]

Scenario: We are customer of company ABC. We use their software. Every day, they make a copy of our database for us on their network. We can connect to that, query, etc. We want, on a daily basis,...
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3answers
71 views

How to find out which port is located on a switch physically

I'm trying to physically located a port on a switch. I know which port the mac address is connected to. The port is Gi2/0/14. But this is part of a stack. How do I know which switch this port belongs ...
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1answer
39 views

Cisco ASA and a Router?

I'm trying to understand networking and when looking at the different routers, firewalls and switches, I came across Cisco ASA. I've read that these can be used as firewalls and routers but others say ...
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1answer
43 views

Route advertisement and FIB programming

Que1. Assuming bgp is running on a network device, will the route advertisement and FIB programming(basically populating entries in hardware) occur in parallel? Or does it occur sequentially, meaning, ...
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1answer
33 views

What layers of the TCP/IP model does an SDN involve?

New to Software-Defined Networks. I know that an SDN involves an Application plane, a control plane and infrastructure plane. By definition, I know that the application plane is in the Application ...
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10 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
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20 views

my question is about How to Subnet my network of 2 routers 1 switch (2vlans) and 2 laptops? [duplicate]

Loopback1---R1-------z--------R2---L2 | | | | |______S1_________| || ...
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3answers
54 views

Connecting 2 buildings on same site via fiber

If I have 2 buildings on the same site, connected to each other via a fiber connection and they both run to the same ISP, would both buildings need to be connected to a firewall? For the main ...
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1answer
24 views

Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?

I can query a interface detail: admin@Juniper-EX# run show interfaces ge-0/0/1 detail Physical interface: ge-0/0/1, Enabled, Physical link is Down Interface index: 131, SNMP ifIndex: 504, ...
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20 views

CISCO Packet Tracer

Does Cisco Packet Tracer support config memory and config network command? If no, then do enterprise routers still support it?
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1answer
37 views

Suitable Laptops

Not sure if this topic or question has been asked before but if I was to buy a 2019 top spec macbook pro, would instill be able to connect to Cisco devices, I'll be running windows on it as well but ...
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32 views

Can you use the first and last subnet in IPv4? [duplicate]

I know you can't use the first and last address -in- a subnet. (I.E. 192.168.1.0 or 192.168.1.255) but there is some amount of disagreement in my Networking 1 class whether or not you can use the ...
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1answer
37 views

what are Hardware size and protocol size in ARP header? Attached image

While working on packet capture for a simple scan, just had a look at packet capture and want to know what does hardware size and protocol size means in a ARP header?
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20 views

How Actually OSI model works?? I have numerous doubts in that which i mentioned below. Can anyone address those questions in simple way? [duplicate]

Acc. to my understanding i have few doubts first comes..sender like me who opens IE or Chrome to access a website then i write https://example.com Here i am using internet service using some ...
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2answers
86 views

what is difference between MSS and Window Size?

What is actual difference b/w these two? 1) I have gone through many tutorials on Youtube where some have told that Window Size is what total packet size it can receive eg Window Size is 15000 bytes ...
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1answer
22 views

Strict source routing using my own scattered PCs/ routers

I would like to completely control my network transportation by defining the packages path. According to this I can't do it unless I have control over all the PCs/ routers in its way. Suppose, I can ...
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0answers
39 views

Why can I ping 10.10.10.140 from 192.168.1.15? [closed]

I'm on a 192.168.1.0/24 subnet, and when I ping 192.168.1.137 I get a response saying the host is unavailable (as expected because I don't have any machines using that address) However, when I ping ...
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1answer
49 views

What are network port maps and what are they used for by the networking team in an organization?

I am curious to know what information generally the port maps contain.
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30 views

How to analysis the below situation, is the too many switch trunk connect caused this issue?

I have two Juniper EX switches, and the Juniper-EX-01(ge-0/1/1) connected to the Juniper-EX-02(ge-0/1/0). I want to check is there any optical attenuation problem, or other link errors. admin@...
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1answer
47 views

What is POF in networking?

I was reading some academic articles about networking when I read "protocol oblivious forwarding (POF)" which I tried to google it but I got nothing to simplify it. Please, what is protocol oblivious ...
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1answer
19 views

telnet connection response if port is closed on firewall [closed]

If port xxx is not open on a firewall, what would be the telnet response when attempting to open a telnet session from a remote host in network "A" connected via site-to-site VPN with network "B"? ...
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1answer
40 views

Is there a way to determine my network transportation to specific path?

How can I determine my network transportation to specific path. I would like to determine that my data packages will go through specific routers.
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3answers
56 views

IPSec VPN timers query

I have a couple of queries related to the IPSec VPN and I believe someone would clarify my doubts. Why IKE Lifetime and IPSec Lifetime is used? Can't we just run the VPN without re-negotiating? Why ...
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1answer
23 views

Does transmission delay affect both outgoing and incoming traffic?

If the transmission delay is the time it takes for a router to put a certain number of bits onto a link, why wouldn't it take the same amount of time to take them off the link? Thus making the total ...
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1answer
23 views

Router Extended Access Control List

Why can't we place the Extended ACL close to the destination not the source ? What will happen if we do so ?
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2answers
47 views

How to check if any network connection is quite stable

Is there any ways that we can understand a network is quite stable? In previous time a serial network interface did fail sometimes to establish a connections. Now I have replaced a new one [...
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1answer
23 views

Router Standard ACL

I was configuring Standard ACL on router 1841 on Cisco Packet Tracer with the help of command access-list 1 permit 172.16.40.3 0.0.0.0 and access-list 1 deny 172.16.40.4 0.0.0.0 and then I applied ...
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2answers
74 views

Why the three-way handshake use so short time accomplish it?

I use the Wireshark captured the packages: in there you see the number 1594-1596, the three-way hankshake only use 0.0002s(0.2ms) it complete it. but when I in the server(103.215.9.27) ping the ...
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2answers
65 views

What's the DF flag mean in IP packet header?

In the IP package, there is DF flag: Don't Fragment. I have doubt about it, is it mean let all the L3 device do not to fragment the IP packet (if the L3 device found it is bigger than MTU, device ...
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1answer
61 views

what is the definition of out degree and in degree in computer networks?

in wikipedia we have a good definition for in degree and out degree in a graph: " The degree of a node is the number of connections or edges the node has to other nodes. in-degree is the number of ...
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2answers
130 views

Why the TCP client haven't receive the ACK response, it send the FIN package?

I use the WireShark captured the TCP connect. you see the three-way handshake(1-3) and the four-way handshake(5-8): But, from the frame list, I have a question about TCP. You know the TCP should ...
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1answer
52 views

Why the seq number set to random, there will be safer in TCP connect?

From the TCP document I have read this: First, client sends a TCP packet with_ SYN=1, ACK=0 and ISN(Sequence Number)= 5000_. Do not forget, sequence number is random and it could be between 0 to 4,...
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1answer
74 views

is there any limit/role for `syn` initial number and `seq` number of TCP three-way handshake?

We know the TCP three-way handshake, I want to know is there any limit/role for syn initial number and seq number? I hear about the number set random can protect server, who can help talk about this?
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0answers
26 views

Trying to understand how DNS works [closed]

I try to run a tightened down machine security wise, and I was running the application network monitor program "SmartSniff", and I noticed DNS calls to port 53 out to a website I had visited in the ...
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0answers
12 views

Who determines a premium domain name? [closed]

Nearly all domain registrars have premium price tags against domain names that have one or two words. But whom is initially putting the high price tag on these domains? Is it ICANN, an invisible ...
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93 views

Fortigate SSL VPN Tunnel - How connect to different network

I have a router and a fortigate firewall. The router has 2 active interface 192.168.100.2 and 192.168.160.1 while the fortigate interface with IP address 192.168.100.249. There is a server with IP add ...
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1answer
35 views

Why the TCP traceroute map jump over many routers? [closed]

I can not understand this TCP traceroute map: This is a TCP traceroute from Chongqing,China to LA,USA: the 219.158.3.146 is Beijing Unicom the 219.158.96.26 is LA Unicom. the path is this: Why the ...
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50 views

Set up multiple WAP4410N AP with same SSID

We are facing a WiFi connection issue in the prod environment at client place (a big hall, around 200ft x 150ft). Details: Environment: 4 Cisco WAP4410N Access points mounted on the pillars in the ...
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1answer
56 views

Reasons for buying ASN for organisation that are located at single place

I see here that even some organisation/universities have bought ASN which are located at single location. What benefit they will get by buying ASN ? Is it compulsory to buy ASN if I have to buy some ...
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1answer
33 views

What is benefit of allocating ASN to edge routers and not Ip addresses

What is benefit of allocating ASN to edge routers and not Ip addresses ? I mean we could have given these edge routers unique public ip addresses too ?
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1answer
24 views

Connectivity problems in a topology [closed]

I cannot identify any network problems in the following topology. https://i.imgur.com/eyUEzvz.jpg Any help in identifying problems would be appreciated, and I would be happy to work on them.
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1answer
39 views

How to score links in a network represented as graph?

I am working on an academic research about networks. I have proposed my model a a graph that nodes are users with commodity hardware connected to each other via internet as graph links. I know this is ...