Questions tagged [network-access]

One of the three layers of network design. The main characteristics of the network access layer is that it provides the access point for devices connecting to the network at a reduced "cost-per-port".

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Access list and interface vlan

Pleasae I am facing this problem, the ping is always successful from 10.16.13.2 to 192.168.0.3 even if Iam configuring the acl in the 'in indirection'. show ip access-list Extended IP access list ...
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No access to internet via DHCP, but works with manual IPs

My DHCP server was giving out IPs in the range 10.0.0.1/24, but I ran out of usable IPs, so I changed the subnet to 10.0.1/21 to have more available addresses, however I am now having a weird problem: ...
Mike's user avatar
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5G PUSCH resource allocation at gNB for multiple UEs in Random Access procedure

As specified by 3gpp specifications, the initial access process is a random access procedure. The first step is to transmit a preamble over the PRACH occasion. If the base station successfully decodes ...
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Network exposure function in 5G core network [closed]

I want to integrate Network exposure function(NEF) to another core network functions . Is their any one help me how to do that?
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how do I fight/ protect and gather evidence if my router was copy Mac and my Mac was ported? [closed]

I learned recently that my devices including router had it's Mac address copied multiple times. I believe I'm going through a network hacking that uses the Mac addresses to drown my network services. ...
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Does sharing laptop Wi-Fi cause network noises or network slow down?

We have network (Wifi network) issues in our organization the network is slow and sometimes the access point throw out some connected users. We contacted ISP and they checked our network configuration ...
Asrar Ahmad Ehsan's user avatar
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Why need Ack flag if we already have ack number in TCP

If we have ack number so from there we can trace that how many bytes are received and which byte is need next so then what is the use of Ack flag there?
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How is P actually chosen in P-persistent CSMA?

I am struggling to understand how the probability value P is chosen for P-persistent CSMA for any particular station, what's the logic behind this.I have read from Wikipedia . P-persistent This ...
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Cisco ASA access-lists and net config

Here are my config to this network. I found the ASA doesn’t ping through each other. Also, when I type show crypto isakmp SA and IPSec Sa, it doesn’t show anything at all. Could you guys find what’s ...
David Huang's user avatar
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protection method that you need to know exact 3 or more ports to access network

long time ago i found an wiki article for method that protect your network from unwanted access. method was something like: attacker need to know 2, 3 or more exact ports which are open to access the ...
Philip Scot's user avatar
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Do DSLAM and OLT function like a switch?

Let's say for example we have the following hypothetical topology: In each network, can each user communicate with each other? For example, can User 1 ping User 2?
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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 ...
sheffadmin's user avatar
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3 answers
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What are limiting factors of Ethernet payload size regarding the future of internet traffic?

The ethernet payload is 1500 bytes. Devices have to deal with a huge number of frames, where many are fragments of one and the same message. More than a thousand just for an image file for example. ...
colorblind's user avatar
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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 ...
I Love Stackoverflow's user avatar
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VPN operating on layer 3, internal routes are accessible, but how to use it as a 'stepping stone' server for external servers? [closed]

I'm not really sure what my problem/request is called, but this is my situation: I run an OpenVPN Access Server server. It's configured to operate on layer 3. The private subnet it can operate on is ...
Mave's user avatar
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Static NAT and PAT

I have two private IP addresses, want to make them NAT to 203.0.113.0/2 public IP address. WAY 1 : Static NAT (2 ip addresses NATted to one by manually) WAY 2 : PAT (Router gives port number ...
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Can computers connected within a Network via Ethernet monitor access the information uploaded/downloaded on a different computer

Suppose there are many computers connected within a Network. Let's take 2 examples. Computer A and Computer B, connected within the same network. Suppose, At the start of the day, say myself as an ...
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VLAN access list for ip-helper addresses

I am forwarding two ports of broadcast UDP data from an inside private network VLAN (VLAN 100) to two outside private networks via WAN connections on an ISR4431. The broadcast forwarding seems to ...
Joe Hughes's user avatar
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1 answer
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Why must host A continue to transmit after host b sends runt frame post collision on ethernet? (CSMA/CD)

Trying to understand example from computer networks: a systems approach ... -Host A sends Host B a frame at time t; Packet arrives at B at time t + d; (d = one link latency) Instant before frame ...
spacecadetmatt's user avatar
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Why computers can communicate on different networks and routers won't?

I have a problem that I can not understand it myself and I need some help. I'm doing a kind of challenge, well network challenge in cisco packet tracer. I have a .pka file that stands for Cisco Packet ...
RickyLo's user avatar
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Router Extended Access Control List

Why can't we place the Extended ACL close to the destination not the source ? What will happen if we do so ?
user60845's user avatar
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802.1X MAC auth : Dell N2048 switch returns malformed EAP packet

I'm trying to set up MAC authorization with 802.1X using FreeRADIUS, a Dell N2048 (DN OS6.3.3.9) switch as the authenticator and a Ubuntu machine as the supplicant. I've followed this guide for ...
Pro-oui's user avatar
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2 answers
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How to ping router from L3 switch

I am stuck in that that switch can't ping router and router can't ping switch. How to fix that ? I tried so much variants but them didn't help me Actually router must do static routing, that i am ...
Awesome Man's user avatar
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How cellular networks gets internet? [closed]

Mobiles get internet but how? From the towers, we used to get signals and communicate with others like calling or a message but coming to the internet how in the terms of networking terms like radio ...
Satya Sai Ganesh Manepally's user avatar
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1 answer
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Deploying Virtual Stackwise Catalyst 9400

I am looking into deploying Virtual Stackwise on the Catalyst 9400 series switches. I wanted to know based on best practices where should the VSL links be deployed on the Sups or the modules? Is there ...
vng1203's user avatar
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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 ...
Cror2014's user avatar
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4 votes
1 answer
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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?
Sayantan Dey's user avatar
3 votes
1 answer
219 views

ASA 5505 cant access inside network from Anyconnect SSL Connection

So I have a ASA I can connect via SSL perfectly fine receiving internet.My issue is that I cannot ping any device on the network especially the inside network on my router. My topology is a ASA 5505 - ...
andrewixl's user avatar
5 votes
2 answers
698 views

Assigning a single switchport to different VLANs

I've been trying to figure out how to achieve the outcome below. VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- ...
Samson Oduor's user avatar
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1 answer
60 views

How do I block IPs on my network? [closed]

I manage a network meant for specific people, who in turn illegally share the Wifi SSID logins with friends (and so repeated changing of passwords isn't a good option). How do I configure the border ...
Masssly's user avatar
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IP Domain-name on aggregation layer switch

Hi I was trying to generate ssh key for a switch I read that , ssh key is generated as a combination of hostname and domain-name I created a domain name like test But doubt is , why isn't the ...
PDHide's user avatar
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7 votes
1 answer
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DCF and PCF in Wifi-networks

I am studying, trying to learn how DCF (Distributed Coordination Function) and PCF (Point Coordination Function) works as access methods in WiFi, and how they relate to infrastructure vs ad hoc ...
martinr's user avatar
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1 vote
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Network segmentation with VLAN and MAC auth: thoughts about implementation

Currently we have a medium-sized, flat network with some DHCP pools. This configuration isn't satisfying us anymore, as everyone can see everything on the network and it may leads to security issues. ...
Pro-oui's user avatar
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1 answer
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What's the meaning of "3D Universal Edge Routers"?

What's the meaning of "3D Universal Edge Routers"? I often see this term on Internet, but I do not understand what it stands for. Such as "MX240 3D Universal Edge Router", "MX480 3D Universal Edge ...
three-blocks's user avatar
1 vote
1 answer
62 views

Are there any advantage of using multiple threads for a file upload, for an internet connected node? [closed]

I got asked in an intervew recently to design a file upload feature. After initial discussion, The interviewer asked if I can design for multiple threads. My thought was, As the network bandwidth is ...
gkns's user avatar
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1 answer
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Cisco 2960-S switch with MAB and Packetfence Web Authentication

I am trying to set up Packetfence In my corporate environment for guest users, with MAC access bypass. i have done everything like in the official Packetfence installation guide https://packetfence....
bkalcho's user avatar
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1 answer
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Network routing/WAN failover

Hi any one recommend me WAN Fail-over in Cisco 2811 router in virtual interfaces I already try this configuration. but its not working ip route 0.0.0.0 0.0.0.0 192.168.86.1 ip route 0.0.0.0 0.0.0....
waleed jamil's user avatar
2 votes
2 answers
98 views

Network ( routing and switching) , security

In my company network i am installing new cisco2811 router but i have problem, my LAN network can not ping and access network. i get point to point internet from ISP. PTP IP is 192.186.86.200/24 and ...
waleed jamil's user avatar
6 votes
2 answers
11k views

How does the ARP table work in case of the Gateway Router?

Suppose I am a host, I understand how ARP works in case I address an IP within my subnet. For each IP address there is a corresponding MAC address, and the owner responds to my broadcast ARP query. ...
Ninja Bug's user avatar
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1 vote
1 answer
574 views

How should I connect two sites through the internet? [closed]

I have two sites which are 3km away from each other, both sites have internet access from the same ISP. I would like both sites to have access to each other throught the internet routers (TP-Link TD-...
Jaz's user avatar
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1 vote
1 answer
276 views

Options for Company A server access to Company B network (on same premises)?

I'm looking for the best way to allow access to another company's server from within our network (We are both located on same physical site). At the moment Company B have limited infrastructure and ...
user47811's user avatar
1 vote
1 answer
302 views

Authorize IoT devices to connect to a WPA2 network without a password

I have an air quality IoT device that connects to WiFi and report data to the cloud and are planning to install 100+ devices at a customer location. To install a device, the customer has to connect to ...
ananio's user avatar
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3 votes
2 answers
2k views

Cisco ASA 5510 implicit deny dropping traffic despite permit any ACL

I'm trying to allow VPN access through a specific public IP address on our company ASA. The ASA is currently configured with a /29 public IP address as follows: Interface Ethernet0/0 "outside" IP ...
heiwa's user avatar
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0 votes
1 answer
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Accessing Servers behind double NAT [closed]

Basically, I want to know every possible way to access Linux servers or any other devices located behind ISP'S (Carrier-grade NAT) and our local NAT. I have used VPN and forward-reverse tunneling ...
Sagar Khatiwada's user avatar
4 votes
1 answer
396 views

MAC ACL to prevent access to unauthorized computers

My company wanted to prevent rogue PCs from being connected to our network. Network access must be allowed only for our company users and specifically for PCs, Printers.. that are provided by the ...
samikzr's user avatar
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2 votes
5 answers
2k views

Access non-public IP computer

I am looking into methods how to access my PC from internet. I do not have a public IP (neither for my router nor local PC). I know I can do 2 things: ask for public IP and simply port forward ...
Lukáš Řádek's user avatar
1 vote
1 answer
42 views

Access Control Permissions

I have created a topolgy in packet tracer displaying two networks. I have cpnfigured VLANs on both of the networks and configured access control lists. However, I would like to configure access ...
Dot's user avatar
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1 vote
1 answer
3k views

Can not access my router externally (from internet) [closed]

I have a router Cisco 900E. I am trying to access the router externally(from internet. Non local device). I read a lot about the issue and configured everything suggested. I enabled remote access via ...
Rikotech's user avatar
4 votes
2 answers
514 views

Unbundling local loop

When we are dealing with local loop, we indicate the last mile of connection from the CABINET (or whatever else) to the subscriber. Now, I'm asking to you, the local loop is the medium of the access ...
rollotommasi's user avatar
4 votes
1 answer
13k views

Cisco port security static vs sticky+static

I don't see a different between the two. Both make it to the running config. 1) sticky + static Switch1(config-if)#switchport port-security mac-address sticky ? H.H.H 48 bit mac address Switch1(...
Noob's user avatar
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