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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32 views

Linux networking + mix of auto-negotiation of yes/no [closed]

we have 10 servers with Advertised auto-negotiation: yes as the machines with driver driver: i40e driver: i40e version: 2.3.2-k firmware-version: 10.51.5 expansion-rom-version: bus-info: 0000:12:00.0 ...
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1answer
87 views

Ping to default gateway failing

I am trying to ping to a default gateway which i have configured as 171.2.0.1 but somehow the ping is failing . I am new to network domain so i have less idea about it . Any help is appreciated .This ...
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0answers
8 views

Confused in what maximum number of hosts and maximum number of subnets mean [duplicate]

Given a 172.12.0.0 /16 to be subnetted to appropriate networks. Branch 1 has 80 hosts, Branch 2 has 31 hosts and Branch 3 has 75 hosts. I've already made a subnet table based on these using VLSM: ...
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3answers
98 views

What are the administrative procedures for moving the geographic location of a network?

Original Question Suppose that Alice operates a website hosting business in Maine. She has a warehouse full of servers to which a /28 range of public ipv4 space is routed (call it the W.X.Y.Z network)....
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1answer
128 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
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1answer
227 views

BGP (RIB-Failure - Higher admin distance)

I tried to make BGP routing on this topology .. After that I added 200.200.10.0 network and 200.200.20.0 network in R1, I had rib-failure (higher admin distance) on R2 and R3 .. but I was able to ping ...
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2answers
52 views

How to Balance SPAN Traffic from Redundant Switches

So we are wanting to deploy an IDS device to capture EAST-WEST traffic in a LAN. The actual topology is more complicated but our issue boils down to this: We are attempting to configure SPAN sessions ...
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0answers
86 views

Untagged VLAN in EVPN+VxLAN

I am dealing with very strange issue but wanted to check with experts if i am doing anything stupid or not. I have small size EVPN+VxLAN clos network (OSFP+iBGP+Multicast+Arp-suppression (no ...
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0answers
29 views

Mistakenly added switch configuration on Cisco router 2951 so now it is showing gibberish data on CLI

I have Cisco 2951 router in which my colleague mistakenly uploaded switch configuration from tftp server. Now it is showing gibberish data on CLI when it boots up. I tried to get into the ROMmon mode ...
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1answer
38 views

Intermittent network failures on unmanaged switch [closed]

So the setup first. I've got MikroTik rb3011 as my gateway with one WAN and other ports in bridge. On the MT bridge I’ve got two switches. one is cisco sg300 and for the building nearby there is ...
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1answer
155 views

EVPN VxLAN arp suppression TCAM carving

Deploying Clos design network using leaf Cisco Nexus 9396PX and when trying to configure arp-suppression using tcam carving getting this error Free up tcam slice from VACL (default vacl tcam is 512) # ...
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1answer
33 views

By General Convention if we say the Frame size is 1KB do we take it as a 2^10 Bytes or 10^3 Bytes

In my academic we generally follow 2^10 Byte approach , I m really at loss is it by convention only at my college or something which is accepted widely
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1answer
38 views

How to connect to a machine which is sitting behind NAT router?

I have a server that needs to push a message to a client from which it received a request a few days ago. Now request which was received has the IP address of the NAT router behind which the client ...
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2answers
70 views

Networks theory: Layers, Services and Interfaces

I want to learn about computer networks from the bottom up. I don't really understand the nuances of networking layers, with books mentioning that layers provide services to layers above them, but the ...
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2answers
197 views

Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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2answers
38 views

Physical mapping of ethernet plugs

I work as a cybersecurity consultant. In a shadow-IT devices hunt, we noticed a few unwanted devices plugged on the network. However, even with its MAC address and IP, there is no way for me to ...
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2answers
104 views

Is Bluetooth's BD_ADDR a unique identifier?

In the course of building a system controller: the context is that users have a modern Bluetooth smartphone with the Bluetooth on. I suspect that BT is broadcasting a unique identifier: a raspberry ...
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0answers
21 views

Can I use a wireless access point (or two) to extend my existing wireless network? [closed]

In large commercial buildings I typically see several ceiling mounted Wireless Access Points. When moving throughout the building, I do not have to continually reconnect to different networks (or ...
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1answer
29 views

Do we represent software in network physical diagram?

I am working on creating a wireless infrastructure for a production site and as I am creating a physical network diagram representing the structure of devices, subnets etc. in the network diagram. So ...
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2answers
53 views

Routing infrastructure doubt. It is a functionally design this?

I have design the following network diagram, but I cannot figure out if it could cause some issue on the network: Some detail about the infrastructure: Network connect Ext rtr A, Int rtr B and C is ...
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0answers
22 views

What are the good hardware, software and equipment's suggestions to set up a wireless infrastructure? [closed]

I am working on providing wireless infrastructure suggestions to a client like what software, hardware and equipment will be required to a client in order for them to set up the wireless ...
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0answers
22 views

Endianness of Ethernet Frame in cable, which is correct? [duplicate]

I just learned about the endianess of ethernet frame. Bits in byte are in little endian, but bytes are in big endian. e.g EtherType 0x0800 in cable: 00010000 00000000 Decoding order: <------- <...
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1answer
32 views

Are there broadcast/collision domains on non-Ethernet networks?

What if we have routers or hosts connected via ATM, Frame Relay, or SONET; that is, what if we have IP over SONET, IP over ATM, IP over Frame Relay, etc., do we still have broadcast domains and ...
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1answer
33 views

Unstable network performance within the same facility

Asked this question previously, but it wasn't as detailed as this. I had my network speed improved by my ISP, I tested the network speed from the Fiber media converter, the speed was awesome, tested ...
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1answer
75 views

Do all devices which use Wi-Fi (802.11) use CSMA/CA?

I know this is quite trivial, but I just want to know if all devices which support Wi-Fi through interface cards/hardware (like laptops/PCs/phones..etc) use CSMA/CA irrespective of their router/...
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2answers
27 views

How to find the client's application port during communication [closed]

After reading firewall rules about inbound and outbount I have some questions and the most sources focus on the server's ports. What happens to the client side when is trying to make a connection to ...
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3answers
82 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
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0answers
17 views

Multicasting with Layer 3 Switches [duplicate]

I was wondering if someone could advise on this please - I want to set up multicasting on a network of layer 3 switches. So I understand I should enable ip igmp snooping on all the switches and then I ...
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1answer
66 views

How is a video calls bandwidth reserved on a wifi network?

All the older versions of Wifi, except for Wifi-6, give each device on the network the entire bandwidth /highway no matter how small the amount of data it needs to transfer. Can someone explain how ...
2
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1answer
109 views

IPv4 and UDP/TCP packets inside of ICMP packet?

A week ago, after opening wireshark, i was surprised by seing a storm of ICMP packets from different IP addresses. While deep analysing of thoses packets, i noticed that those ICMP packets contains ...
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0answers
6 views

IP address, network ID, host ID and subnet ID [duplicate]

I am studying a course about computer networking and again I stumbled upon a section that raised a question. I found very helpful people in this forum and I hope you can help me once again. During the ...
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1answer
37 views

allow 2 machines to communciate each with their own network? [closed]

2 networks. Network 1 local and i want to be able to receive and send information to network 2 which is at a remote site, branch site. How do i go about connecting both networks so that both machines ...
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1answer
48 views

What if receiver changes its IP address during the transmission process?

Suppose I am sending data to a laptop with IP address say x but before data could reach its destination the laptop is moved to another network and now its IP address becomes Y. Will the receiver still ...
2
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1answer
48 views

what is significance and role and function lifetime in IPSEC Site to Site VPN . Please explain importance and role of lifetime in VPN

I Came across incident where i need to troubleshoot IPSEC Site to Site connectivity issue . The term "lifetime" confuses me . please anyone explain me importance of lifetime in VPN . Whats ...
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1answer
50 views

Access IPSec site from another IPSec site

Our company delivers, installs and maintains custom build hardware at customer sites. In all cases the delivered setup contains at least 1 server and 2 network devices. To keep the control over the ...
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1answer
25 views

Propogation delay vs time required to send out a complete frame on channel

I was reading Data Communications and Networking by Behrouz A. Forouzan in which for simple Aloha protocol the vulnerable time given was T(fr) (time required to send out a complete frame on the ...
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3answers
471 views

Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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0answers
33 views

What are difference between SSL VPN and IPSEC Site to Site VPN [duplicate]

I am little confused between SSL VPN and ipsec site to site VPN packet flow and authentication methods and moreover what are significant difference between two VPNs . As per my understanding IPSEC ...
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3answers
115 views

Is there a rigorous difference between a WAN and a LAN?

The main WAN (wide area network) of this world is the one named "The internet" although there might be others I don't know of. Contrastingly, there is no "main" LAN (local area ...
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0answers
23 views

Please Explain me traffic flow between two peers for ipse site-site vpn traffic , detailed traffic flow please [closed]

please explain me the exact traffic flow between two peers or gateways for IPSEC Site-Site VPN .Like phase 1 ,phase 2 , actual data processing traffic flow .
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0answers
9 views

How to find Best Fit Mask [duplicate]

How does i find the best fit netmask (i.e., resulting in as few host addresses as possible) for a network with 62 hosts in it? I don't have any class like A,B,C How can i find best fit netmask for ...
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1answer
22 views

answer packages rejected between mangle/prerouting and nat/prerouting

I am currently configuring a ubiquity edgerouter for our network. We have one uplink port (eth2) and two internal ports (eth0; with vlan 1) and eth3 (with vlans 2,3 and 4). uplink and vlan 1 have ...
2
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1answer
26 views

Wants to understand traffic flow of Catalyst layer3 Switch 3850 . what are sequence this switch will check to delivery packet to destination

i wants to know clear understanding about how Cisco layer3 switch checks in sequence order when traffic arrive to its L3 Interface . i want to know traffic flow in Cisco layer 3 switch ,because switch ...
2
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1answer
118 views

Confusion about Route based IPSEC site-site vpn and policy based IPSEC site-site VPN

I am confused about the major difference between a policy-based VPN and routed-based site-site Vpn
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1answer
197 views

How do I properly serialize a network packet [closed]

So I'm currently writing a program that is essentially just a server and a client. The idea is that I want them to be able to communicate with one and other by sending packets back and forth. And I'm ...
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2answers
32 views

what happend when inbound traffics over the limit of bandwidth? [closed]

Sorry for my English. Let's say there is a chat server in AWS and it has bandwidth limit like 5Gbps. Someday, massive user comes and it spikes a lot of traffic in a second and finally it overs 5Gbps ...
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1answer
40 views

How can i set up a Wireless LAN to serve 20,000 concurrent devices [closed]

How can i setup a wireless LAN that can serve up to 20,000 concurrent devices. I am having a problem in figuring out if i need one router or several routers. A topology diagram with explanation would ...
2
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4answers
120 views

What exactly is “network automation”?

When we say network automation, what "automation" are we talking about? What is that being automated? I've heard that in network automation we do not have to configure each individual ...
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1answer
34 views

What are the benefits and drawbacks of NSPOF networks over SPOF ones? [closed]

NSPOF has redundant links and redundant network components, so I think the biggest benefit it has over SPOF is high fault tolerance and the biggest drawback is the high cost of buying and maintaining ...
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5answers
2k views

How does the shortage of IPv4 public IPs influence existing firewalls?

I came to know recently IPv4 public IP address pools are going to be exhausted soon. If IPv6 addresses are fully in use, all device vendors like Cisco, Fortinet, Palo Alto have to redesign their ...

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