All Questions

Filter by
Sorted by
Tagged with
0
votes
0answers
1 view

Configuring a network for 100% isolation security

I'm configuring a LAN for an office. It's a new setup, and therefore there are desktops but no servers and no PC-to-PC communications - everything is on the cloud. The exception to this are several ...
2
votes
1answer
33 views

Lightweight AP won't join with Wireless Lan Controller

I'm trying to set up a wireless network, and learn at the same time. I'm using a Cisco 5508 WLC and a AIR-CAP3702I-A-K9 lightweight AP. The problem I'm having is that the LAP won't joing with the WLC. ...
0
votes
0answers
14 views

Is there a way to check which routes are matched by a term in a routing map?

I have created a prefix-list and I am using it in a route-map. However, my route-map is not working as I expect it to work. ip prefix-list LIST_A seq 5 permit 10.20.20.0/22 ge 32 route-map A-B-OUT ...
0
votes
0answers
11 views

Network jitter using wifi [closed]

I have a weird issue with my home network but it only happens a few random days. The issue is that I get a lot of jitter suddenly without any explanation. Setup: 1 router serving a 5 GHz network on ...
0
votes
1answer
20 views

Is my Wireless LAN Controller compatible with my Access Point?

I have a Cisco 5508 Wireless LAN controller and a Cisco AIR-CAP3702I-A-K9 Access point. The WLC release is: 7.0.252.0 The AP is : Cisco IOS Software, C3700 Software (AP3G2-K9W8-M), Version 15.3(...
0
votes
0answers
19 views

How to read a BGP table?

I have come across BGP looking glass where I can see the routing table for public routers. Please find below a public entry: BGP routing table entry for 78.97.0.0/16 Versions: Process ...
4
votes
1answer
170 views

Why does the IPv6 header not include a checksum?

It is stated in Wikipedia that an IPv6 header does not include a checksum. What are the reasons that were behind this decision?
0
votes
1answer
14 views

Using a VLAN to Completely Isolate Devices from the Internet & Other VLANs

I have a Cisco SG350-10P Managed Switch, and currently have two VLANS on it, the default VLAN 1 and VLAN 10. I want devices connected to VLAN 10 to have no ability to communicate with the internet or ...
-1
votes
1answer
34 views

What special reserved domain could I use for virtual organization private network? [closed]

Suppose we have a inner-facing network that spans several geographical jurisdiction - this network can only accessed from our offices with special HSM installed, and we want to enable domain-name-...
0
votes
0answers
10 views

Unable to Connect to MQTT Broker on Vendor Network (ESP8266) [closed]

My goal is to try and establish a connection with our AWS MQTT via an Internet Provider’s WiFi on port 8883 with the ESP8266. I am using Mongoose OS for this purpose. We are using an AWS MQTT broker ...
0
votes
0answers
7 views

How to select between two NICs for data transfers between a Windows 10 PC and a QNAP TVS 951X NAS? [closed]

I have two Ethernet adapters on my system. One is the inbuilt Intel 1218-V gigabit nic that came with the Asus Z97 Pro WiFi AC motherboard. I installed an Intel X550-T2 dual port PCIe 3.0 x4 NIC. Now, ...
0
votes
0answers
11 views

how to divide traffic packages between two sub-interfaces in Linux [closed]

We Have one main physical interface, for instance, "eth0" and we have two inside Linux sub-interfaces "eth0.1" and "eth0.2". We have some traffic on eth0 and we want to dive traffic packages randomly ...
1
vote
1answer
45 views

Removing VLANs from core trunks (.1q)…?

I am a little embarrassed I do not know the answer to this already, well I think I know the answer but I am not 100% sure and this I need to be 100% sure on. We have several core .1q trunks that we ...
0
votes
0answers
13 views

Cisco C3232C 100G Link [closed]

Last week i tried to establish a 100G link in a Datacenter with one of my carriers. Even the sh int eth1/X transceiver detail showed very lambda signal normal at both sides and the switch doesn't seem ...
0
votes
0answers
17 views

Powerline and 20m cable line to ethernet device [closed]

Because the is no cable tubing in the wall I had to use a powerline adapter to get internet from my router to my basement. The internet connection works fine when I plug in my laptop directly into the ...
0
votes
0answers
18 views

What is wrong with this CRC calculation? [duplicate]

I have gone through a few documents to understand how to check that an ethernet frame is valid. I do the following calculation, but I can see it is incorrect because it does not result in a crc value ...
0
votes
0answers
8 views

ideal/suitable values for “TCP connect timeout” [closed]

I'm configuring ncat and like know suitable values for TCP connect timeout in seconds. I'v googled "TCP connect timeout" and found a lot of different values ranging from 45 to 240 seconds, throught ...
-1
votes
0answers
17 views

Valid MAC addresses [closed]

I have a problem which asks which of the following MAC addresses represents a valid MAC address: 00-ab-29-fg-17-39 00:65:2d:4f:3c:9b 01:23:45:67:89:ab 01-23-45-67-89-ab I know there ...
0
votes
0answers
17 views

Is it possible to share vmware VM connection with guest OS? [closed]

I have 3 virtual machine.. My 1st vms has internet connection itself using dial up modem.. How do i share the internet connection from 1st VMs to 2nd and 3rd VMs?.. I have been thinking using some ...
4
votes
3answers
3k views

TCP port 0 reserved for what purpose?

I was asked a question my one of my teachers. What is TCP port 0 reserved for? I did a bit of searching and research found 2 reasons: For linux based system, to get the next available port from the ...
0
votes
1answer
59 views

Is it possible to use a gigabit connection on 10/100 load balancer?

My ISP provides a connection output of 1000BASE-T. I am trying to feed this to a load balancer device that only supports a 10/100 connection. However, the connection is not detected. I am afraid this ...
0
votes
0answers
16 views

What is wrong in this CRC calculation? [closed]

I have gone through a few documents to understand how to check that an ethernet frame is valid. I tried to implement the algorithm described on the wikipedia page (in swift 5.1) : // we run ...
0
votes
0answers
9 views

Http, ping, dns and bandwidth - http connection speed [closed]

My question is how each of above protocols contribute in connection speed. Let suppose an http server S and a client A : Does ping speed depend exclusively on the physical distance between A and S? (...
3
votes
1answer
18 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
vote
0answers
18 views

Nexus OS IP SLA Object tracking

I have not configured IP SLA object tracking on nexus OS before and its looks a bit confusing. Can someone help me interpret the following configuration? This example shows that object tracking is ...
0
votes
0answers
10 views

Ethernet-Wifi Bridge needed for mesh network [closed]

I have an Ethernet only device that has no USB ports. I am looking for an Ethernet to wifi adapter that would work on a mesh network. Most everything I see will only work with a single AP. Does anyone ...
0
votes
0answers
6 views

Connecting my T568A patch to my switch [closed]

I have my home wired up to a T568a terminal. I have tested all the ports with a LAN Tester. I have also tested the cables and all check fine. However, when I connect the cat5e port to my switch, I am ...
0
votes
0answers
15 views

relation between networking and protocols [closed]

Disclaimer: probably all that follows is wrong or flawed. Background Most of the home-networking, and this might be wrong, consist on some signal coming to an antenna that afterwards comes down to a ...
0
votes
1answer
50 views

Problem in cisco routing bgp routes

We have an outbound route-map on an eBGP peer that adds some communities to certain prefixes. Is there any way to prove that this is actually happening from the sender side in classic IOS? show ip ...
0
votes
1answer
31 views

What are the current security issues S-BGP has?

The question is explained in full in the title. I wish to know what the security issues are when deploying S-BGP. Thank you in advance!
1
vote
1answer
19 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 ...
5
votes
3answers
984 views

Unknown EtherType

I am parsing an ethernet dataframe. It has the form : (destination_mac_6_bytes) + (source_mac_6_bytes) + (ether_type_2_bytes). Usually, I see ethertype like Ox86dd (IPv6). But I came across this ...
2
votes
1answer
29 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 ...
0
votes
0answers
24 views

Is a firewall needed on a small office that simply needs internet access? [closed]

I'm planning on porting all of my office's software needs to cloud services that I can access via internet. It's a simple LAN that has a NAT gateway pointing to the open internet. Would a firewall ...
0
votes
0answers
12 views

How to perform the CRC check for an ethernet frame [duplicate]

I have an Ethernet frame of n bytes, ending with 4 bytes that contains the Frame check sequence (32 bit CRC). What calculation do I have to perform to perform the check ? I looked on the algorithm ...
1
vote
0answers
42 views

Connecting GNS3 Topology to the Internet

I'm trying to connect my small topology to the internet through the Cloud device, but I'm not able to connect to even my own desktop's IP from the virtual router I have. I have Windows Defender rules ...
0
votes
0answers
9 views

Reasonable security of RDP VPN access [closed]

An organisation I work with requires that employees be able to connect to machines on their network and log on to them from machines that are not on the network and not joined to the domain. They ...
0
votes
1answer
17 views

Count to infinity under a tricky condition [closed]

I was looking around and couldn't find an answer to a tricky situation regarding count to infinity issue. i was wondering if it can happen in the following context: The following network consists of ...
4
votes
3answers
1k 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 ...
3
votes
2answers
211 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 ...
2
votes
3answers
21k views

Multiple POE over a single cable

I try to solve a problem using Power Over Ethernet technology to Power supply differents devices. I would like to avoid to buy new router and try to make it work without any expensive costs (if ...
1
vote
1answer
25 views

Do sequence and acknowledgment numbers treat 3-Way Handshake differently?

1- Just as the message ID that is assigned to each message in PAR, the "sequence number" is a means of providing reliability in a transfer of a byte stream. So sequence numbers are assigned to every ...
1
vote
2answers
54 views

BGP rule to avoid given ISP?

Is it possible to have a rule/policy in BGP to avoid a given ISP for the traffic? Ex.: traffic from the USA should touch middle east ISPs if the target/source is not from/to there. I am not sure ...
-1
votes
0answers
22 views

Network - how can my coworker be on same network if he is in another country [closed]

I recently joined the Social Media company. While working I realized that one of the coworker works from a different country (thousands of miles away from the office where I sit), while still be in ...
0
votes
0answers
11 views

PoE switch won't power more than one device at once [closed]

I have five custom sensor modules that I need to connect to a control panel. The network is shown in the attached image. The sensor modules on the right have these PoE splitters. The red lines in the ...
1
vote
1answer
378 views

How is user gaining Remote access via SonicWall without VPN

Hello and thanks in advance for your advice. I recently started supporting a small business and have a problem I can't figure out. The office has 6 remote employees who access the office network via ...
1
vote
2answers
1k views

Accessing Sonicwall VPN behind new modem

So we have a Dell Sonicwall unit that serves as our firewall and also runs the VPN functionality via the Sonicwall SSL-VPN and the accompanying client side application, Sonicwall NetExtender. We have ...
-1
votes
2answers
39 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 ...
-2
votes
0answers
19 views

Average internet speed(KBps/MBps)? [closed]

How to calculate average internet speed(KBps/MBps) from time and download volume? For example if 200MB was downloaded with in 2 hours, what was its average download speed?
17
votes
5answers
7k views

Why use IP if we already have a MAC address?

I am preparing for ICND1 exams and recently started to learn about different Cisco devices. I have just come to know how the packet is generated to be transmitted over a network, or outside the ...

15 30 50 per page