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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2answers
249 views

Can you become your own ISP?

How exactly does an ISP connect you to the vast network of computers which is the internet? In my area there are several ISP's. For example. Bell, Rogers, and Cogeco all connect you to the "same ...
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1answer
70 views

eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...
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4answers
97 views

Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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3answers
1k views

Which is the best way to encrypt all the IP traffic in LAN?

I'm trying to encrypt all the IP traffic in a small LAN network but the in that network all kind of devices are connected i.e. PCs, Laptops, IP Cameras, IP Sensors, etc (new and old devices). I have ...
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1answer
91 views

What steps must be accomplished in each layer of the TCP/IP model to connect a website?

What steps must be accomplished in each layer of the TCP/IP model to connect a website?
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3answers
1k views

Fiber between two sites - no signal lights

We need to have fiber connection between two sites (distance less than 300 meters from each other). Currently there is multi-mode fiber connected to old switches working nicely. Now we are updating ...
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0answers
52 views

Cisco Router Interface Connection Problems

I am new to networking and am configuring, I am trying to setup my connections in packet tracers for 3 different routers to talk to each other over Serial ports as attached. However, I did notice ...
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1answer
20 views

What role Wifi Password play in the connection with the AP?

I was trying to study about how my device connect to the AP via Wifi. I saw many concepts like WPA,WPA2,MIC, 4 Way Handshake and much more. I studied all of them but I still cant understand where in ...
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2answers
1k views

Cisco nexus CRC error on interface

I have dual stack vPC setup between 4 cisco nexus switch as per above design. I have noticed recently that getting CRC error on cisco 3064 all 4 interface connected to N9K, and during peak traffic ...
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0answers
15 views

Comparing ETX with PRR with retransmissions

Expected number of transmissions (ETX) and packet reception ratio (PRR) are two routing metrics that exist. Based on my understanding, the packet reception ratio reflects the link quality. If you ...
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1answer
151 views

Copper or Glass for Low Latency?

I'd like to preface the main content of this post with the following: I understand this question may be equally suited to the Physics Stack Exchange, and so I have posted on there as well, but maybe a ...
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2answers
4k views

Why is symmetric NAT called “symmetric”?

After searching a while, I'm still not able to find a logical explanation on why is it called symmetric NAT. Where lies the link between symmetric NAT and that each request is mapped to a unique ...
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1answer
132 views

LAG links between access switch and stacked switches

When an access switch is connected to two stacked switches through two links, is it necessary to configure LAG for those two links? (Those black links in the picture below.) Or the stacking would ...
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2answers
238 views

How is it possible to get multiple virtual network interfaces with only one physical network interface?

I'm currently struggling about the fact that I could create (almost) unlimited virtual network interfaces with only one physical NIC. How does that can be possible ? To give you more context about my ...
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1answer
15 views

What is the format of data packet in AODV based MANET?

Can anybody guide me please. I spent a lot of time over the literature to find out the data packet format of AODV routing protocol. however I found only RREQ, RREP, RERR and ACK formats, but there is ...
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1answer
659 views

How to route traffic via firewall in EVPN + VxLAN

This is what i am trying to design new network, this is just on paper nothing finalized and i am sure it has lots of issue like firewall should be on leaf not border leaf etc. so that is why i am here ...
3
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1answer
804 views

Latency of 10G fiber SFP+

I'm optimizing network stack for latency. We were using SFP+ with fiber than we came to know that Direct Attach Cables (DAC) have lower latency as there is no SFP involve Link. We are measuring wire ...
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3answers
39 views

Can two or more computers that are physically close together form a connection/network without a router? If they can, how do they do so?

So, I am pretty familiar with things when a router is used. To my knowledge, packets travel from Computer A to the router, then the router directs it to Computer B. Problem solved. I get confused when ...
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1answer
134 views

Will arp table on the host (linux) will refresh after no of failure?

Let say I have a remote hostA and remote hostB. Initially hostA has an IP address of ADDR1 and hostB has an IP address of ADDR2. Now clientA made a successful connection with hostA using ADDR1. ...
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1answer
32 views

What would the bandwidth be while transferring from a machine with a 2.5 Gbps NIC to a machine with a 10 Gbps NIC?

I have two machines connected via a managed network switch capable of supporting 10 Gbps bandwidth. What would the bandwidth be if I transfer data from machine 1 with a 2.5 Gbps network card to ...
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1answer
245 views

Are subdomain and subnetting related concepts?

Recently while trying to grasp some basic networking concepts - I felt subdomain and subnetting are related concepts and wanted this group to confirm and add more insights on this. I understand that ...
0
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1answer
32 views

How are the rules in a network protocol defined? [closed]

New to network protocols here. Everywhere I read about network protocols it keeps claiming that they are simply just some rules and guidelines that allow computers to link to networks - but how is ...
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1answer
44 views

Why does Network address translation (NAT) need Port Address Translation (PAT) if IPs are different in the internal network?

For example, there are several servers in the local network 192.168.0.1, 192.168.0.2, 192.168.0.3, etc. They are connected to one public IP. Why does NAT also assign ports to each local IPs that are ...
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4answers
68 views

P2P Connections

Hey there I am a noob in the field of networking and I have a confusion: What is the difference between point-to-point and end-to-end connection ?
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2answers
53 views

Segregated network - managed switch or router?

I have 3 pc connected to a switch that is connected to a bigger network. I want those pc to live in their network and don't expose their ips. (in this very moment the scope is accomplished using a pc ...
0
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1answer
101 views

Significance of UTP / FTP in relation to keystone connectors

Whilst I am aware of what F/FTP, and the like, means in relation to cabling, I am a bit nonplussed as to the significance when applied to a keystone connector. To my understanding, if a keystone ...
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1answer
21 views

Passing network bonding to other port [closed]

I currently developing network for office place using mikrotik cloud core router, the outline is 2 ether interface into 1 bonding interface and distributing into 2 ether interface or maybe 1 ether ...
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3answers
84 views

Point to point link with two Internet connections

Thank you in advance for reading this question. I have two buildings, let's say A and B, each connected to the Internet. Devices in A also need to access devices in B and vice-versa. The Internet ...
3
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2answers
482 views

Why the network switch drop the frame acording to ethertype/length?

I have a network switch IC , and I am using to the send BPDU packet. I can send packet with 2 byte ethertype/length field like this : 81 00, 80 00, 91 00 and some special hex number. But if I try to ...
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0answers
34 views

Why do corporate networks prefer application-level over network-level proxies? [closed]

I was recently using an application at work, which was unable to download needed files because proxy settings were not configured for the application. The company firewall blocks non-proxy connections....
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1answer
84 views

ASA shows Action:Drop on packet-tracer, no reason or phase

I am doing a very simple lab with one asa and two computers. PC1 connected to dms PC2 connected to outside : Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores) : ASA ...
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1answer
56 views

Campus Area Network Deisgn [closed]

I have 10 buildings in a campus and I want to design a Network. The design should follow the three layered hierarchical model. Below is my design, I just want to know if the design will work just fine ...
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1answer
293 views

Symmetric routing and asymmetric routing plz elaborate

First of all thanks, Am pretty much confused this both term of routing read blog's and notes but still kinda confused.
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1answer
52 views

PoE only data and power over network

Is ethernet(PoE) the only (power and data) over the network. I did google this I'm dyslexic and dysgraphic so English I tryed
0
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1answer
57 views

What is underlay and overlay network?

Curios to know about underlay and overlay networks and differences between them.
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3answers
128 views

Can odd or even parity correct errors

Can odd or even parity correct errors? Odd or even parity can be used to detect errors. Can it correct errors?
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3answers
2k views

What is the least possible separation of two NICs with the same MAC address?

Suppose you have two NICs with the same MAC address, but not necessarily the same IP address. What is the least possible separation (in terms of number of switches, routers, different IP subnets etc.) ...
0
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1answer
102 views

Unable to receive logs from a device to our SIEM Syslog server via TCP 514 [closed]

I want to collect logs from a security device (McAfee Email Gateway) to our SIEM Syslog server. This security device can forward logs only via TCP syslog on any port (in our case it is 514). We are ...
3
votes
1answer
151 views

Cisco ASA5585-X replace SSP-20 with SSP-60

We have cisco ASA5585-X with SSP-20 running in production and we need more power so planning to replace SSP-20 with SSP-60 module but not sure we can just hot swap with SSP-20? Does ASA5585-X support ...
1
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1answer
82 views

How does triple handshake avoid establishing connection for duplicate packets(coming later down the line)

The idea behind triple handshake seems to be for duplicates to not cause issues. The way I understand it host sends a sequence x to server. Server acknowledges it and sends it's own sequence y. Host ...
2
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1answer
55 views

Why do we need machine learning for QoS classification in SDNs if we have DSCP in IP address for QoS enforcement?

DiffServ (Differentiated services) uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. If ...
3
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2answers
239 views

Internetworking packet transfer

What happens when a packet gets lost or corrupted? Mostly flow control is in the data link layer with acknowledgements. Does this happen on network layer as well like among multiple networks. A packet ...
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2answers
113 views

Why is there a need for a MAC address on top of IP address? [duplicate]

The way I understand is that MAC address uniquely identifies a NIC on a global level. IP addresses do not because they may go through a NAT box and the ISP may issue a single external IP address for a ...
4
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3answers
2k views

Why can a host with a single NIC and on two networks have 2 IP adresses?

I understand that an IP adress refers to a NIC and not to a host, therefore a single host can have as many IP adresses as NICs. But Tannenbaum says: It really refers to a network interface, so if ...
0
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2answers
66 views

Can Northbound interfaces (REST API) in a Software Defined Network (SDN) be used to manipulate QoS parameters?

I am working on a project involving Quality of Service (QoS) manipulation in Software Defined Networks (SDNs). I know that the following parameters affect the QoS in an SDN: Time information (inter-...
2
votes
1answer
48 views

How a wireless access point reads all the available SSIDs

When a wireless access point is broadcasting its SSID (beacon frame) I assume it sends it on specific selected channel (channel 1-14 for 2.4 GHz network). But how do all the other access point ...
2
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1answer
87 views

Information on TEXNET

Anyone familiar with the TEXNET protocol? I have 35 machines in an industrial setting that are from the late 1990's that use a TEXNET protocol to communicate with a PC system. Is there anyway to ...
0
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2answers
790 views

Can I set up a WLAN with a WAP but without Internet?

I was able to set up a LAN with the following configuration : A main computer (Windows PC) with a DHCP and DNS server, who is configured to have a static IP address Three devices (embedded Linux) ...
2
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1answer
81 views

Actual Network speed for multi port adaptor

I get confused with speed of adaptors having multiple ports. E.g. chelsio T-520CR is 10Gbits dual port adaptor. Does this means both ports have 10Gbits speed i.e. effective 20Gbits or total speed ...
0
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1answer
110 views

Is there a method to modify bits in IP packets with OpenFlow? [closed]

We've already known that ovs-ofctl provides many actions to modify packets like set_field, load, move... but I can't find a suitable action or action combination to modify a bit in the IP packet ...

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