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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1answer
18 views

10G NIC Dual port - Will I get ~10G throughput on both ports simultaneously

I have a dual port 10G NIC. I need to know if it is possible to get ~10G throughput in both the ports simultaneously? If yes, how can I test it out? If no, then will both port have ~5G thoughput ...
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0answers
12 views

Will my router act as a DNS server? [on hold]

I tracerouted both my router's IP as well as my DNS server's IP even though they had different IP, I got the same results.
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2answers
38 views

Meaningless bits in CIDR notation

Is specifying meaningless bits valid syntax in CIDR notation? For instance, the netmask of 192.168.13.0/16 is 255.255.0.0. In this case, the last two octets (00001101 00000000) are meaningless because ...
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0answers
29 views

Restrict access from others [on hold]

Currently, I join into a house-group, that contained many users. I am provided a network cable that I can't know/change any settings. The diagram is as the attachment. The questions is : May I ...
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1answer
36 views

Broadcast link vs. point-to-point links

What is the distinction between broadcast links and point-to-point links? In the paragraph below, the author switches between "broadcast link" and "broadcast network" which is causing my confusion..is ...
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0answers
13 views

How to track and chose the path when source have two paths to reach same destination? [closed]

One source(Host) have two paths to reach destination where first path have 3 hops and second have 4 hops . Please tell me why and how source get to know which path have to follow ?(Asked this question ...
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0answers
8 views

Accessing a USB Printer over a network [closed]

I've set up an old label printer (Cognitive Advantage 4 inch) on a PC that is hardwired in to a network. I've made the printer visible on the network using the 'share this printer' setting in windows ...
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0answers
21 views

Accessing network Devices past a Router [closed]

I was watching a video on youtube about how owners of BOTNETS scan the internet looking for devices that they can take control of. It mentions how IOT devices are so dangerous and that a lot will have ...
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0answers
13 views

CentOS And Virtual box, conflicting networks [closed]

I am new to Linux and networking in general and I tried to set up a network. the problem that occurred is already solved however I am not sure what causes this problem and this is what my question ...
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0answers
6 views

Winsock throw errorcode 10061 when excecuted from different machine [closed]

I created two programs with Winsock, a server program and a client program. When I excecute them on my windows machine (in different cmd windows of course), I am able to receive a message from the ...
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1answer
41 views

Connect Router cisco 892FSP to internet thru LiteBeam 5AC Gen [closed]

I have a Cisco router 892FSP connected to my ISP provider, who give internet thru an AP gateway 192.168.1.1. I reseted to factory the router and I configure on GigabitEthernet WAN 9 : ip 192.168.1.20 ...
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0answers
70 views

Cisco nexus STP loopguard

I have cisco nexus switches in vPC and they are connected to HP c7000 blade center switches and all my c7000 blade server has Linux Bridge is running, i believe something went wrong somewhere in Linux ...
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1answer
78 views

Understanding Throughput of interfaces problem on Cisco Routers

I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3. I aim to send ...
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3answers
80 views

Understanding how VPNs work?

I am trying to understand how VPNs work. Most of the posts/blogs on the internet say that all your traffic is routed through a VPN server. This sounds like proxy to me?? Another point that is commonly ...
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1answer
35 views

VPN server acting as a client for another VPN server [closed]

I was wondering if it's possible to have a VPN server that goes though another VPN server. Here a scenario that might explain my idea better: I have 4 computers 'A' - My Windows machine 'B' - My VPN ...
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1answer
35 views

Difference between port-channel lacp fallback individual VS. static?

What is the exact difference between: port-channel lacp fallback individual port-channel lacp fallback static
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1answer
18 views

LAN to LAN Connectivity of Moxa routers

I am with background of DevOps and to optimize stuff in office i am assigned a networking task with not much experience of networking. My scenario is like below I have two moxa (EDR-810) routers ...
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0answers
22 views

Modbus Wireless

What is necesary to implement a modbus over wireless? I know that ethernet and modbus have different application layer different which evolves different package format and different physical ...
3
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1answer
29 views

Bit stuffing and Error correction combined

If I understand correctly both error detection/correction and framing are done at the link layer. I understand how popular error detection/correction and framing techniques work. But I struggle with ...
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5answers
2k views

Cascading Switches. Will it affect performance?

I am really new to large scale networking and all I know is the basics. I will be doing a network for a huge workspace consisting of multiple offices. There will be a total of 308 Clients, with at ...
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0answers
19 views

How is it possible to create 6 subnets? [duplicate]

The following task presents me with an insurmountable obstacle... Given is the following: IP: 192.168.40.0 Subnetmask: 255.255.252.0 Task: Form 6 subnets over this network and enter ...
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2answers
51 views

Network IP Allocation

We have two ISP's named as A and B, are connected with RV325 Router. Is it possible to route A ISP to specific private IP without NATing
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1answer
27 views

How 2 devices with different speeds communicate [duplicate]

This is an extremely basic question, But I couldn't find any answer for that. In the scenario which I have a very old compubter that transmits 10Mbits/s and a switch that has 100Mbits ports, how ...
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1answer
40 views

Juniper port forward range of ports with dynamic pppoe

I have Juniper SRX300. Due to some restrictions, i can't use static WAN IP address. I need to port forward a range of ports and it's working only using nat static section like this: username# show ...
4
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1answer
119 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
71 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
25 views

Why Korenix Switches hang up SSH so often? [closed]

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 ...
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1answer
77 views

Cable can connect to laptop but not recognised on switch

I have a solid core all weather cat6 network cable running for 40m to an outbuilding which houses my work office. The cable is properly installed and screened. It is buried to the correct depth. ...
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2answers
46 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 ...
1
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1answer
40 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
46 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
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
82 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, ...
3
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1answer
82 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 ! ...
13
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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....
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0answers
50 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 ...
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2answers
83 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
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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
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1answer
48 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
49 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 ...
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2answers
100 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
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1answer
78 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
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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 ...
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2answers
47 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
15 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
139 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?
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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 ...
3
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2answers
74 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 ...
1
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0answers
47 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 ...