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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.

0
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0answers
5 views

Network discovery survey template? [on hold]

Does anyone know of a good template to fill out when gathering info for a major network overhaul/upgrade? Something that will gather info on the entire network topology on all layers down to end ...
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0answers
8 views

Can I replace a generic router with NAS router [on hold]

At present for my local network I have a normal router without VPN support. For backup purpose I was planning for Network Attached Storage (NAS) device. What I see is that this NAS has VPN Server ...
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0answers
14 views

ppp-ppoe in network [on hold]

Someone in my network did somehting they shouldnt. All I got from them was an IP (which is the same for everyone in the network. Followed by ppp-ppoe-somethingHere. How can i find out which specific ...
4
votes
1answer
95 views

Ingress filtering on edge routers and performance concerns

The RFC 4778 cover the Operational Security Practices in ISPs Environments back on 2007. Among the best practices, a common one is Ingress Filtering on edge routers. In the above RFC, the author says ...
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2answers
55 views

Do we send the same packets when we send the same data?

When we send the same data over a network twice, does this means that we are sending the same packets twice? I am trying to understand how my decoder works, so I command using an application on phone,...
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0answers
21 views

Why Korenix Switches hang up SSH so often? [on hold]

Does anybody know, why Korenix Switches hang up SSH so often? And then, you have to restart the switch each time, that happen. On HP Switch there is no problem with that SSH. If anyone has any ...
-1
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1answer
56 views

Cable can connect to laptop but not recognised on switch

I have a cat6 network cable running for 40m to an outbuilding which houses my work office. Recently it's been the case that the connection can be made directly on my laptop, but switches (and the ...
0
votes
2answers
42 views

Delay, Packet length and transmission rate

Why does the delay in sending a packet from source to destination doesn't depend upon the transmission rate and the packet length? If we look at the delay formula then it is, L/R + D/V.
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0answers
15 views

Why are large networks unable to rely solely on the use of physical addressing? [duplicate]

First of all, I would just like to point out just how new I am to the subject of computer networking. Therefore, I apologise if my question seems a poor one however I am currently unable to find an ...
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0answers
18 views

openVPN client connects to VPN server from Android app but not from Ubuntu or iOS app [on hold]

Disclaimer: I am posting with full knowledge that the school owns the network and has every right to restrict traffic as they wish. My rpi3 is running an openVPN server configured using PiVPN and it'...
1
vote
1answer
37 views

Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...
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2answers
38 views

Connection between two networks with different IPs and identical subnets?

How can we establish communication between two networks with different IPs but same Subnets? Network Connection 1: (Factory Network for machinery) I.P = 192.168.19.X S.N = 255.255.255.0 G.W = 0.0.0.0 ...
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0answers
11 views

Problem with Sharing a 4G Network using multiple Access Points [closed]

I have a really interesting problem in my home network currently. Due to DSL speed limitations of our ISP in my area, I upgraded to 4G network with roughly 3x the speed I get from my previous DSL ...
-1
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0answers
16 views

Splitting into 4 subnets [duplicate]

I am trying to attempt a past exam question. The question is as follows, Consider a router that interconnects four subnets: Subnet 1, Subnet 2, Subnet 3 and Subnet 4. Suppose all of the interfaces ...
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0answers
9 views

Multiple DHCP servers detected by access points [closed]

I’m having an issue with our internal network and voip network. I currently have it setup as a non-converged network separating our two data switches and one voip switch. We preferred not having our ...
-1
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0answers
11 views

Is it possible to simulate a cable modem connection? [closed]

I am trying to setup a test network. I want to provide an equivalent to a cable modem connection without actually having a cable connection. The reason is I have a dd-wrt modified router I'm trying to ...
-1
votes
1answer
24 views

Connect to the Same VPN with two different PC on the same Private Network [closed]

From two different PC on the same private Network, is it possible to connect to the same VPN with the same credentials???
1
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0answers
18 views

Can QoS provide a benefit after data has gone through other unmanaged switches first? [duplicate]

Details about the devices We have a 24 port NETGEAR managed POE switch that has QoS capabilities. We have the following unmanaged switches, 24 port Cisco POE, 48 port Cisco, 48 port NETGEAR, and 24 ...
2
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1answer
58 views

Do unmanaged switches honour QoS priorities set by managed switches?

Details about the devices We have a 24 port NETGEAR managed POE switch that has QoS capabilities. We also have the following unmanaged switches, 24 port Cisco POE, 48 port Cisco, 48 port NETGEAR, ...
-1
votes
0answers
12 views

Secondary router used as access point has extremely low speed [closed]

I have had a spare BT Homehub 4 set up as an access point connected LAN-LAN via power line adaptor for boosting signal in my house. The main router is an ASUS DSL-AC68U. I receive download speed of ...
-1
votes
0answers
13 views

Cisco Packet Tracer - How do I connect these networks through a router? [closed]

I am trying to connect these two switches through the router as shown and also correctly configure the wireless router on each network so that they connect to their switch. Basically anywhere there's ...
2
votes
1answer
64 views

NAT and two internet providers, how to configure failover

Will you please help me to setup ISP2 as a failover internet provider. Configuration as follows: ip source-route ! ip cef ! no ip domain lookup no ipv6 cef ! multilink bundle-name authenticated ! ...
11
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6answers
3k views

Network latencies between opposite ends of the Earth

This is just out of curiosity. I'm currently in South-east asia, and when I pinged domains such as bbc.co.uk and google.com (in California), I get latencies of around 5ms as below: 64 bytes from 151....
3
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0answers
36 views

Cisco nexus 9396 rebooted with reason xbar_client

Today my one of cisco nexus 9396PX switch got rebooted and this is what i found, based on following logs what could be wrong? We don't have Cisco support for this switch, trying to see if i can get ...
0
votes
1answer
29 views

Why does Nmap not detect a host which is active and responds to Ping?

I have connected to another laptop via the LAN cable, i am able to access the services running on the other laptop via Ip & Port. When i Ping that Ip, the machine is successfully responding. But ...
1
vote
1answer
40 views

Which TAP is the right one for my network?

I want to buy a TAP but I'm uncertain which device is the right one for my environment. The command sudo lshw shows the following about my Ethernet: *-network description: Ethernet ...
1
vote
1answer
43 views

Connecting networks from different states [closed]

Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
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0answers
47 views

Unable to ping from one computer to another

Below you can see the topology of my network in cisco packet tracer. What I am trying to do is ping B2-Guest from B2-Management. When I try to ping B2-Guest from B2-Management the packet is lost at ...
0
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2answers
44 views

What does it mean when the last digits of an IP address change? [closed]

So in a case where I have an IP address, 162.158.68.xxx, what is happening when those values in xxx change? I ask because I'm looking at requests going through to my application's server and one of ...
2
votes
1answer
69 views

Using an Ethernet cable and USB Ethernet adapter at the same time?

What would happen on using an Ethernet cable connected to one network and then plugging in another Ethernet cable but using an USB Ethernet adapter from a different network. Would it connect to both ...
0
votes
1answer
51 views

Map of WAN cables in general [closed]

Whenever i search for the physical location and path of WAN connectivity, i only find submarine cables, and a site that seems like a paid service. Is there no free map where i can e.g. show the route ...
0
votes
2answers
45 views

should phy layer and mac layer be designed together?

I have a question about the independence of the layers. I know that the layers in protocol stack are designed in a way to be independent from each other. I want to know does it mean also that we can ...
1
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0answers
13 views

Why can't I reach mail.google.com, translate.google.com and chrome.google.com? [closed]

I'm experiencing trouble trying to connect to Google. This is the case both through any web browser, and ping from Command Prompt. The trouble is limited to: Laptop devices but not Mobiles my home ...
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4answers
124 views

Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
3
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3answers
76 views

Is it possible that two servers were configured with the same ip under the same switch

I have two physical servers, their configuration as following: ServerI: IPADDR=10.1.1.5 NETMASk=255.255.255.0 ServerII: IPADDR=10.1.1.5 (Same IP) NETMASk=255.255.0.0 (different NETMASK) Because of ...
4
votes
2answers
69 views

Stop Memcrashed amplification DDoS attack

DDoS is essential part of my life so i am back with more question, Yes we started getting memcache based UDP amplification attacks, all source ports are 11211 coming from many random source IPs, we ...
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0answers
36 views

sflow configuration Cisco Nexus 9396PQ

We have Cisco a Nexus switch with M12PQ 12x40G GEM expansion card. Today when i enabled sflow on one of 40G interface i got following error: # sflow data-source interface e2/12 In order to enable ...
2
votes
1answer
71 views

What is Open Radio Access Network?

what is the concept of this open radio access networks?? more specifically what is this "open" for? how is it different from those of general RAN?
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0answers
7 views

How do netmasks work? [duplicate]

A bit of a noob question, but this isn't quite clear to me yet. Ip Address Decimal 10 20 0 100 Network Decimal 255 255 0 0 ---------------------------------------...
2
votes
1answer
72 views

nxos ansible playbook to configure interface

Last few days i am playing with cisco nexus switch to deploy config using nxos ansible modules to make it automate. I am running n3000-uk9-kickstart.6.0.2.U6.6.bin software and here is my playbook ...
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0answers
20 views

Questions about IP addresses [duplicate]

So, I have to research IP addresses, and there are a couple of things I don't quite understand. In my test there will be questions like 'Which of those IP-addresses is private' or 'which of those is a ...
1
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3answers
62 views

How to explain the data flow of OSI model layers in a single picture [duplicate]

Take an example of searching www.example.com in a web browser. I have some confusions at each layer and they are We have opened a web browser and searched for www.example.com. Now, As far as I know, ...
1
vote
1answer
37 views

Help with network setup [closed]

I have the following situation: Router 2 is a given. It is used by several people to go on the internet ('People we don't trust'). We are a tiny company that is supposed to go on the internet ...
7
votes
2answers
858 views

Why do IPv6 unique local addresses have to have a /48 prefix?

According to RFC 4193, unique local addresses will always have a prefix of FD00::/8.. but according to Wikipedia: The block fd00::/8 is defined for /48 prefixes, formed by setting the forty least-...
1
vote
1answer
22 views

Can a hub be used for sniffing traffic from a device?

My intention is to analyze all network traffic which is coming to and originating from a network connected device I have. From the configurations of the device I am able to proxy all the HTTP traffic ...
0
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0answers
18 views

Confuse about type of handover in Mesh Router?

I have difficulty in understand the concept of handover which can be categorized into two: Horizontal or Homogeneous handover Vertical or Heterogeneous handover Horizontal handover occur within the ...
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2answers
96 views

Confused about the results from the cable tester

A little bit of backstory, just in case you want some context. In the last couple of weeks the network at least internally has slowed down. As far as I can tell the only things that have changed has ...
1
vote
1answer
35 views

using 802.1x with nic teaming

I am working on a project which is mandatory to have each pc configured with two network interface cards as a nic team. I want to use 802.1x for authentication with a radius server like cisco ISE. My ...
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votes
1answer
50 views

Cisco ASA not passing traffic between two interface

I have Cisco 5506 with Security Plue License and following is my configuration. interface GigabitEthernet1/1 nameif inside security-level 100 ip address 10.0.10.1 255.255.255.0 ! interface ...
7
votes
2answers
2k views

What is IP squat space

I came across this article and I'm trying to understand what is going on here, I found some packets on my network containing 22.0.0.0/8 and 29.0.0.0/8 IP range and It's based on: https://en.wikipedia....