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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Redirect network of on url to proxy otherwise block it [closed]

I want to use proxy only for one website URL, and if the proxy is disabled or down, the URL blocked by a firewall So in my mac os, I connect to a proxy server somewhere, and then if I open, for ...
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9 views

Monitor a Network Link for Reliability [closed]

Please can someone suggest a simple tool to monitor the reliability of a network connection? I've recently started working for a MSP (first job) and one of the clients I support has a small building ...
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What should guide the setting of buffer size in the netperf TCP_STREAM test [closed]

I'm trying to measure the network throughput between two machines that's geographically far away from each other (asia to eu), and I'd like to run netperf's TCP_stream test to get the result. If I ...
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16 views

What are the downsides of setting a large tcp window size [duplicate]

I'm new to computer network and I encounter this formula: maximum network throughput <= TCP window size / latency If latency is more about the geographical factors or network hardware (e.g. 4g ...
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RSVP warning: ID "data" is not configured

I am trying to follow this document: https://www.cisco.com/c/en/us/td/docs/ios/qos/configuration/guide/12_2sr/qos_12_2sr_book/config_rsvp.pdf to configure rsvp, using gns3, for Entering Senders or ...
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5answers
798 views

Different Behaviour of a Router

There are 2 cases that I would like to point out: When the router is directly connected with 2 PCs like this, In this case, PC2 is able to ping PC3. I just configured the IP address of PC2 and PC3 ...
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1answer
73 views

Is this network configuration possible with Layer 3 switch and ISP routers?

If possible I would like to use a Cisco SF350-24 Layer 3 switch to enable the below network layout. In our office we have 2 internet connections we often use for testing that require an internet ...
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0answers
14 views

Novice packet sniffing question: Several connections to Google cloud services [duplicate]

Hi as the subject states, I've got a whole block of connections on 'TIME_WAIT' to google cloud IPs (based on IP lookups). I've been trying to understand my network activity during networked gaming ...
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29 views

Logs on my Cisco ASA show the public gateway (ISP router) is pinging the internal network, how? [closed]

Im (remotely) working with an issue where the network has intermittent drops. i suspect possible routing loop, but havent confirmed that yet. In the logs of our Cisco ASA 5506, i see that the public ...
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3answers
43 views

One Missed Point in Data Link Layer Concept?

I see one Course Lecture as follows: I trouble in understanding "source address for the next node’s reply", What is the meaning of next node's reply?
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1answer
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How do wireless access points work? [closed]

I understand what the intent of wireless access points are but I am struggling to understand them fully on a deeper level. So, do wireless access points have their own network with their own IP ...
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Types of ARP messages [duplicate]

I have a little misunderstanding which message type the ARP protocol supports. From this link we can see that the ARP header consists of these fields: Hardware Type–It is 1 for Ethernet. Protocol ...
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1answer
47 views

What is the reason behind not returning unused IP addresses? [closed]

There are several companies out there with one or more /8 IP addresses, for example: DoD has more than 200 million, HP has one /8 (>16 million), Apple has one /8, General Electric has one /8, IBM ...
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1answer
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Is fiber to computer(without the use of any other cables in between) possible?? Are any further developments getting carried out towards this goal? [closed]

All of us know well that the fiber to home(FTTH) connections are a trend nowadays. Every nation is planning to replace the existing metal wires with optical fiber cables. But we also see that the ...
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2answers
61 views

what is the main function of root bridge and ring master?

When we learn the STP or RSTP,we all learn the election of root bridge, the lowest priority number or MAC address of switch will become the root bridge.So here is my first question: 1.So what can the ...
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Really new to Networking and wondering how the first 3 octets of 255 is 1 network [duplicate]

Watching this video on subnetting and I am kind of confused as to why the first 3 octets are all counted as one network but the last octet only adding 1 bit to it makes another network entierly. I'm ...
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1answer
44 views

Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
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1answer
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If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology,combined with 8 Hubs and 2 switches,i want to ask two questions 1. If H3 is damage,but the fiber is still ok,will H2 damage too in the future? i have a thinking to ...
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1answer
51 views

questions about queuing delay

I am learning computer network, and confused by the queuing delay. In my textbook, it says that when La/R approaches 1, and with random inter-arrival times, then the average queuing delay is closer to ...
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2answers
64 views

network IP packet format

i completely understand that why receiver there is 576 bytes but my question is as technology update every after one Minutes then why we can't update that limit [enter link description here][1]
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2answers
362 views

In tunneling, how destination routers identify if a packet is encapsulated?

In tunneling, a packet gets encapsulated in the payload section of another packet. If the router at one end encapsulates the packet, then how the router at another end identifies whether the packet is ...
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1answer
104 views

How to tell if an ipv4 address is public or private?

I've read the below thing, in a website. According to standards set forth in Internet Engineering Task Force (IETF) document RFC-1918 , the following IPv4 address ranges are reserved by the IANA for ...
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1answer
56 views

What defines a device as connected to the Internet? [closed]

I recently saw a SO question: Are there global networks other than the Internet? I am aware of other networks such as ATM and the telephone network, which are not part of the Internet. My question is, ...
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1answer
43 views

Understanding the definition of layer 2

The Wikipedia (and other sources) page about the OSI model explains layer 2 as such: The data link layer provides node-to-node data transfer—a link between two directly connected nodes. ... Let's ...
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2answers
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why can't my PCs ping each other?

Consider the following network I can ping just fine from PC0 to PC1 and PC2 to PC3, but I can't ping from PC2 to PC1 or PC3 to PC0. Why? I'll share the configuration from the router: Building ...
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0answers
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What exactly SLIP is (was) used for? [duplicate]

I try to understand what scenario exactly did the SLIP protocol (and its successor PPP) is aimed to address. Let's start with describing a modern network system, and help me figure out where SLIP used ...
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1answer
38 views

What is the addressing problem of SLIP? [closed]

In the RFC1055 that describes SLIP, in the DEFICIENCIES section, there is a bullet named "addressing" which says: both computers in a SLIP link need to know each other's IP addresses for ...
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0answers
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my pfsense is reducing the speed to 40 mbps from 300+ mbps, what can be the issue? [closed]

I have a pfsense system BUSINESS B100 - CELERON DUAL CORE J1800 2.41GHZ 4GB DDR3 SODIMM SSD 60GB HDMI. https://www.amazon.com.br/gp/product/B086M2D8DJ/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&...
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1answer
25 views

Does creating frames done by device drivers?

If I got it right, TCP and IP packets are created normally by software running in the kernel. So when I as a user open up a socket of type TCP/IP and send a message, the kernel takes care of all those ...
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3answers
2k views

Why can PPPoE connect to a gateway which is not in the same subnet

We know the host needs to be within the same subnet as its gateway for the routing. However in PPPoE, the public IP has a 255.255.255.255 subnet mask, it means that the IP is not in the same subnet as ...
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1answer
82 views

why can a router make two PCs in different subnets access each other?

Case 1: PC A: 192.168.1.2 / 24, and it connects to LAN port1 of router A PC B: 192.168.2.3 / 24, and it connects to LAN port2 of router A Given above we know A and B can't talk to each other due to ...
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2answers
111 views

Can I backup config of an EdgeRouter Lite 3 to an EdgeRouter 4?

After having worked 6 years and 24/7, my EdgeRouter Lite 3 have definitely died. I want to replace it by a new EdgeRouter 4. Can I easily use my EdgeRouter Lite 3 backup files and import it to a new ...
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3answers
190 views

Router interface on same subnet

Could someone please explain why can't be have 2 interface on same subnet? Do router use network address to forward traffic?
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1answer
31 views

How a socks proxy is different from a normal proxy? [closed]

Socks is a protocol that a proxy uses, then it's called socks proxy. A normal proxy may use any other protocol. How a socks proxy is different from other proxies. What are all the unique features of ...
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0answers
20 views

What is preamble in ethernet frame and why is it used? [duplicate]

I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean? Also I've seen another definition that preamble gives NIC time to realize a frame is ...
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0answers
20 views

What is the goal of the OSI model? [duplicate]

I'm currently learning about the OSI model, trying to understand exactly what it is and what is the purpose behind it. The Wikipedia page says: The Open Systems Interconnection model (OSI model) is a ...
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1answer
39 views

What exactly defines a WAN?

I've found this question but it doesn't seem to answer my question. What is the "technical" definition of LAN and WAN I know that a Wan consists of more LAN's together and MAN's and it's ...
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1answer
35 views

How Switch knows if the packet reached it's destination?

In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
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1answer
20 views

In PPTP, do encapsulated packets get further encapsulated in Ethernet frames?

I know that for PPP to travel in datalink layer 2 (ethernet) , the ppp frames need to get encapsulated in a ethernet frame , thus PPPoE. Is the same case for PPTP too?
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0answers
18 views

What really a point to point connection means? [duplicate]

I know that point to point connection is used to directly connect between two nodes without any intermediate. But if we take in our world the internet(WAN) , let's say I want to achieve a point to ...
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1answer
25 views

Does a receiver send acknowledgements after data received/failed in a bus topology and in ring topology? If so, how?

if in a bus or ring topology, is there any acknowledgement or error mechanism that if a packet is sent/or failed to receive/lost.
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1answer
46 views

How do switches handle network data if the destination computer is powered off in half-way?

Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
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1answer
43 views

Connectivity issues with 127.x.x.x series [closed]

I have a couple of servers with the below config server1: lo: 127.0.0.1/16 scope host eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet ...
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2answers
70 views

Are duplicate sequence numbers from different TCP-connections possible?

While learning about Sequence and Acknowledgment numbers one thing bugged me. I wasn't able to rule out for myself if the following scenario in which Host A sends data to Host B by using some ...
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0answers
7 views

im having trouble understanding subnets. I want to set up two subnets. net 1, net 2. net 2 can see net 1, net 1 should not see net 2 [duplicate]

I tried doing this by changing the mask, but now that I think about it broadcast would be different for each net. So to clearify net 1 devices can talk to each other but not net 2, net 2 devices can ...
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0answers
13 views

Why do we need Layer 3 logic to communicate to other networks? [duplicate]

My knowledge about networking is a bit rusty and as I am watching and learning about networking, TCP/IP and potentially get a CCNA/CCNP certification a thought crossed my mind: I keep seeing (simple, ...
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1answer
35 views

My laptop not comes on the network when connected to cisco 2951 routing port, so it does not ping [closed]

I have assigned 192.168.1.2/24 IP to laptop with 192.168.1.1 gateway. This gateway is actually the IP address of the Cisco 2951 router port. But my laptop doesn't come in the network that's why it ...
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4answers
113 views

IPv6 addresses plan and allocation

I read at several places that ISPs should allocate a /48 (or /56) IPv6 addresses blocks to end users Wikipedia for instance The RIRs assign smaller blocks to local Internet registries that ...
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1answer
18 views

Achieving clock synchronization via 1588V2

Is it possible to achieve frequency synchronization between 2 network points (not TOD but actual frequency) - by using 1588V2 alone ? Or do we have to use SyncE for that ?
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1answer
81 views

iSCSI with dedicated switches

Looking to purchase some dedicated 10GB switches for our iSCSI setup. Would the following setup allow us to use two switches for redundancy? Two VMWare ESXi hosts, each with 2 10GB NIC Storage with 2 ...

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