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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Why does the speed drop on extending an already extended WiFi network [on hold]

Let's say I have 3 WiFi A, B, and C. My setup is: WiFi A: Is connected to ethernet cable(this one is the main router which connects to the internet) WiFi B: Extending WiFi A WiFI C: Extending Wifi ...
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16 views

How to find out the DMZ server of a specific host [on hold]

I'm coming from the Database side, so forgive my ignorance. I work in an environment where there is a heterogeneous network environment with a mixture of internal LAN servers, and also a number of off-...
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25 views

Path MTU is not always 9000, only in one direction [on hold]

I have a question about MTU or path MTU. In my setup I have 2 computers (firewall, Windows PC) and one NAS, each with a gigabit interface. They are connected throughout the same gigabit switch. In all ...
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13 views

How to create script for L2 switch initial configurations [on hold]

hostname IN-MH-PUN-AUNDH-WM-2F-L2-STK1 username Legend secret VqOVGuwXdIldt9QG service password-encryption enable secret VqOVGuwXdIldt9QG vtp mode transparent ip domain-name ####.com ip routing ...
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11 views

Why does one machine on my small LAN have UPnP port forwarding enabled? [on hold]

I'm a web developer tasked with network administration for our small business. Looking at our gateway's logs, I see that one machine has port forwarding enabled. The guy who works on this computer ...
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1answer
22 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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10 views

VMware Physical Machine Networking [closed]

Need some quick networking help to wrap my mind around some networking issues i'm having. I have two physical windows machines A and B which are running VMWare and I need them to be on the same ...
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15 views

How can I become a network engineer? [closed]

How can I become a network engineer? Now I'm a CSE student. Where and how should I start learning? What are the guidelines of it?
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1answer
20 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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24 views

Network Performance Improvements [closed]

I have a case study which I'm working on and would be grateful if anyone could spare a few moments to provide any suggestions or advise with regards to making improvements to the design. Here's the ...
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11 views

OFTP Connection [closed]

Good morning, my company has a client who needs to send files and asked if we had set up OFTP. They just say they use this protocol for file transfer, so we have no alternative. This client has ...
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2answers
26 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
19 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
62 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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19 views

Ping arrives on server but no reply is send [closed]

I have two servers running on Ubuntu. Both are connected to the internet with a pfSense which also provides a VPN. Problem: I can ping the backup but not the main. I can also not open ssh or any ...
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2answers
45 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
42 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
91 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
49 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
72 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
10 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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20 views

Problem with GNS3 cloud (Pc's network adapter)

I want to connect a router in gns3 with a loopback network adapter (present on host/pc) Earlier(2 weeks back) when i was using it it was working fine, but now when i am opening the same project the ...
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69 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
28 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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45 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
40 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
30 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
38 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 ...
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20 views

How many Flow Tables can be used in OpenFlow 1.0.0

I came across a document, saying that we can use goto instructions, and direct a packet from Table-0 to Table-1. I am particularly using OpenFlow 1.0.0 (because POX Controller supports 1.0.0 only) I ...
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1answer
31 views

Binary to decimal conversion question [closed]

If Decimal 15 = Binary 00001111 can it also equal 01111 ? If not why? sheet with conversion decimal-binary
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1answer
57 views

Why using Telnet with SNMP? [closed]

Recently I got a question asking what is the reason to use SNMP in combination with telnet since using 2 protocols is not a good practice. I did a research on the topic but could not find reasonable ...
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1answer
55 views

Any expected issues with stack of 8 Cisco 3750X switches?

I am planning the network for our new offices this time utilising Cisco 3750X's (WS-C3750X-48P-S). The required port count has gone up and up so have had to procure some extra switches to bring the ...
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0answers
26 views

Connecting 2 networks virtually [closed]

I am currently working on setting up a small personal network for home use and my own experimentation. I currently have a small network of computers operating from within my home and I have a server ...
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1answer
35 views

Setup VLAN within fiber SFP switch with a ROUTER

Good day, I am simulating a setup as below: The configurations as below: 3 switches are joined with fibre optics in TRUNK mode. PC0 joined to gigabit port of switch in VLAN 20 (192.168.2.55/24), ...
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1answer
29 views

POE negotiation between IEEE PD and the POE Switch?

I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
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2answers
52 views

Can't get to the Internet from VLAN on switch

I'm trying to setup a network lab to learn more about networking. Equipment: 2 procurve switches. 1 Sonicwall firewall TZ300 The final outline: traffic from Vlan 10 on switch 1(port1) goes to ...
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1answer
61 views

Scaling fragment offset

I studied that fragment offset has 13 bits. At transport layer segmentation is done considering the the MTU at lower layers (network layer, data link layer). Ethernet format says the maximum data ...
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1answer
25 views

Can't connect to network printer while other's in the building can [closed]

I'm unable to connect to the shared printer in our business center. Every unit is on the same wired internet. The instructions state that I should do Run->\10.10.41.11 but then Windows says it couldn'...
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0answers
18 views

How to connect 4 class C networks by router [duplicate]

We have 4 isolated class c net works for 4 departments: R&D, Sales, admin and finance. All IP address is from 192.168.1.1 to 192.168.1.254. So maybe 4 PCs have same IP address, for example: 192....
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2answers
95 views

Different MAC addresses [closed]

What happens if a host on the network receives an IP packet with a MAC source address that differs from the MAC address in the local ARP table for that source IP. The ARP table entry for that IP was ...
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2answers
25 views

Mac address table ,packet tracer

I connected two pcs to a switch in packet tracer , no ip addresses at all.and on switch cli I put a show mac address-table command,why there is nothing shown in the table?how does the switch so learn ...
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1answer
53 views

Are these two private subnets completely isolated from each other?

Im trying to set up a subnet address range in my local network but the private address ranges of 172.16.1.1 192.168.1.1 10.1.10.1 are all already being used. So I was wondering, if I make this ...
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1answer
35 views

Bringing two different hosts each in two different subnets into a same subnet [duplicate]

Physical Network: 11.11.10.0(mask:255.255.248) Subnet A 1 :11.11.10.0 IP A: 11.11.10.4 (mask:255.255.248 and 6 hosts) Subnet B 2 :11.11.10.8 IP B: 11.11.10.11(mask:255.255.248 and 6 hosts) Hi ...
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3answers
40 views

Wifi antenna to detect clients

I would like to know if it is technically possibile to detect and recognize a client (PC/smartphone) during its wifi scan. My goal is to get the list with identifiar like mac address or other unique ...
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0answers
18 views

Yealink T22p Quality Issue

We have around 7 Yealink T22p. Phone quality is good when only one phone is being used. If there are more than two phones are being used at the same time, one of them breaks up a lot but it breaks ...
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2answers
57 views

Sending an ipv4 packet to the Destination IP without a router?

We are replacing a "RF modem + Router system" with a Software Defined Receiver. After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received. The ...
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1answer
28 views

Why does this setup fail sometimes with Juniper EX4200?

I've got a very straight forward setup with the following devices: 1 x 10G Fibre uplink (internet) 1 x ASUS AC68U wifi router 1 x EX4200 20 x Servers (With IPMI and single ethernet) The EX4200 is ...
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1answer
67 views

Sending TCP packet to the other device without connection

I think the sending packet to other device works like the following. 1. The server device listens with port. for example 80 2. The client connects to the server devices. for example, the port of ...