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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3answers
204 views

Connecting CPE to Cisco catalyst switch [closed]

I have a set of cisco catalyst switches, that are configured with vlan 10.10.1.0 and 10.10.0.0. I have a CPE from my provider, which is configured with the following information: Network: 10.0.30.8/...
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2answers
1k views

Spanning Tree cost calculation

We have following network diagram, but SW3 isn't in place, and I have a question before I plug SW3 into the network. Sorry, I put in the wrong diagram before. The following diagram is the correct one: ...
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1answer
282 views

Is it possible to successfully send a spoofed UDP header with a completely unrelated source IP?

I've read that many networks use ingress/egress filtering to eliminate the number of spoofed UDP packets sent and received by their network. Given that network provides have been much more diligent ...
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3answers
1k views

Need for network layer

I was reading about the 'IP' in TCP/IP. Most of its functions seem to be for connecting different (types of) networks. Does this mean that network layer is not required for communication between ...
2
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3answers
163 views

Which is the correct configuration for this network scenario?

we are developing an industrial network where we must to guaranteed three separated LAN (LAN1, LAN2 and LAN3, please see the attached image below). Our client want the networks to be separated, so ...
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0answers
146 views

Connection between nodes in NS2 [closed]

In NS2, I connected one sink node with two source nodes. For that, seperate two agents are created for sink (For example TCPSink) node and connected with source node (TCP). My question is, are these ...
17
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1answer
19k views

How multiple client connections are made to single web server?

Actually I am learning Computer Networks and while at it, I am confused in how a web server maintains multiple connections? Simply to state, I learned trough some googling is that sockets handles a ...
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1answer
618 views

How to detect IP conflict in WAN and best practices [closed]

I am working on a WAN setup. Normally, the user IPs are assigned using DHCP, but users accidentally set their IP to static, which can causes 2 computers in network have same IP in same subnet. How ...
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1answer
90 views

High Speed data Transmission [closed]

How does NVIDIA GeForce NOW manage such high and massive data transmission between PC and servers? PS: Please attach relevant articles or journal papers to support your claim.
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1answer
2k views

Cisco HSRP CAM vs ARP timeout

Today we received email from our ISP saying they are performing maintenance on their network so if you have HSRP connectivity with them in that case you need to clear ARP table or reduce ARP timeout ...
2
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2answers
983 views

Per Network Namespace Quagga OSPF

I'm new to the Quagga and I'm wondering if it is possible to run a different OSPFd daemon per linux network namespace. My goal is to present a different logical OSPF router to external routers per ...
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3answers
169 views

Increase network bandwidth

I have similiary situation like in question Increase transfer rate with Link Agreggation But with some different purposes - need increas backup speed. ServerA - backup media server (Win2008r2); ...
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2answers
108 views

Why do we need “port forwording” if we can connect to the port ourselves?

I just heard about this thing called "port forwarding". Now, as far as I learned, this means I can attach my IP adress to some port on the router. But why should I do it if the software on my ...
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2answers
344 views

Effect on Utilization if speed of CSMA/CD network is scaled up?

If the speed of the CSMA/CD network is scaled up and if all the other parameters stay unchanged does that mean the utilization will stay unchanged?
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4answers
359 views

Tcp reliabity handled at hardware level?

At work we are moving from a TCP to a UDP protocol for a kind of 3D engine because we have 1s hang when a packet is lost. Since our engine is not designed to handle packet loss nor out of order ...
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1answer
3k views

Calculating valid host range [closed]

what is the first valid host and the last valid host for the network that the IP address 10.150.174.20/17 is a part of?
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1answer
186 views

How do VLSMs work? [closed]

I recently came across a question which I don't know is a genuine one and the question was, Which of the following options are examples of VLSM? A. Subnetting 192.168.1.0/27 into multiple /30s B. ...
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2answers
251 views

Can squeezing an RJ11 cable affect network performance? [closed]

I have just bought one of these: Ultra High Speed ADSL Cable 5m to move my router from the hall into my living room. Before and after I installed it I did a batch of speed tests. I was getting 75-80 ...
1
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1answer
47 views

How does a cloud controller access point work?

My goal is make a web controller to connect and manage a configuration AP, like Tanaza, Ubiquiti, or Sophos. How do they communicate between server and my private network without port forwarding?
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2answers
389 views

Some confusion in Classful Addressing

I was watching a tutorial video on Lynda.com. The presenter said: Class A: First octet between 1 and 126. Class B: First octet between 128 and 191. Class C: First octet between 192 and 223. I did ...
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1answer
73 views

Network building software [closed]

What I have in mind is software, where I can build network virtualy, with routers, switches, subnets etc. (maybe with some kind of checking mechanism). I want to understand concept of networking ...
1
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1answer
44 views

Port SPAN similar to MAC flooding?

I wanted to know if a SPAN port on a switch (which is used to monitor all packets passing through the network) is similar to any other port if a mac flooding attack is performed.
2
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1answer
684 views

How does S/RTBH work in BGP?

We have recently gotten DDoS attacked and we found in NetFlow around 30 ro 40 source IP addresses are attacking us and filling our pipe. So, to prevent DDoS we have null routed the destination (...
2
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2answers
873 views

Root path cost?

A little confused here. Im trying to determine the root port for SWITCH B. SWITCH C here is the ROOT SWITCH. I understand that to determine the root port you need to find the lowest cost path to the ...
2
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1answer
1k views

What is the difference between 'clock synchronization' and 'time synchronization'?

Is there have any difference between this two terms, 'Clock Synchronization' and 'Time Synchronization' in a network? I understand that when clock frequency has corrected to run in same pace is called ...
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1answer
1k views

How to force users to authenticate to get IP adress from DHCP?

Can You help me !! I want to force users to authentificate to get IP from DHCP-server (win server) if not they can't get ip @ adress !! even they are connected to network
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1answer
393 views

Does there exist a difference between ICMP Destination Host Unreachable Message from MacOS/IOS and from Windows/Ubuntu? [closed]

Information I have recently been learning networking programming with Python, and I am now building a host scanner utilizing the ICMP Destination Unreachable Message. Indeed, I have partially ...
2
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1answer
212 views

Netflow and Nfsen related question

We had DDoS couple days ago and following is netflow data but i am confused with numbers which i am seeing here. If you look at first Bytes(%) column 67.2 G(80.6) so it's in GB what does this means? ...
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1answer
49 views

SSL handshake across multiple proxies and SLBs [closed]

A fairly basic SSL question, if you don't mind: Lets say I have traffic flow from a client to a web server as follows: [client] --> [public SLB:80] --> [reverse proxy:80] --> [internal SLB:80] --> [...
1
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1answer
4k views

what is the industry standard meaning of “flat network”

I have typically known 'flat network' to be a non-vlan network, typically a single /24. We have a new hire (security analyst) at my company and he asked the desktop support supervisor if he had "...
2
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2answers
238 views

How to create a network with many access points or repeaters and guest access

I have an existing simple network with internet connectivity. We have four access points that do not offer true guest access. We would like to have four access points that offer wireless for the ...
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2answers
6k views

Is getting host IP address (requester) from HTTP request message possible? [closed]

On an HTTP request message, there is a field for the host ip address and the url of the server : GET /cs453/index.html ~ Host: gaia.cs.umass.edu But How about the IP address of host (requester, where ...
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2answers
825 views

How do I validate Http Proxy Servers from public proxy lists? [closed]

I am trying to do some automated browsing but with identity-hiding/proxy servers. One can find some public lists with http proxy servers up and running. I am trying to instantiate a selenium web ...
1
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1answer
353 views

Pipelined / Persistent HTTP [closed]

I have a question regarding pipelined HTTP, is that the same thing as a persistent HTTP connection. If not what exactly does it mean?
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1answer
582 views

HTTP 302 Redirect - Is this my problem? [closed]

I have an issue where my users are unable to access a particular web service (hosted app on AWS) because of an http 302 redirect pointing us to an incorrect port and address. It works ok from other ...
7
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1answer
1k views

Raw API data for Cisco Meraki CMX Dashboard

Has anyone worked with Meraki's CMX raw data feed and can help answer some questions? I came here to ask because I have found no conversations about Meraki's CMX API elsewhere and I imagined that ...

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