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1

6 computer on a network for small business. 3 XP, 2 Windows 10, and one Windows 2000. XP computers run certain software for certain task. Windows 2000 computer runs software for a large 4 axis table CNC. 2 windows 10 computer run day to day tasks (email, CAD, spreadsheets, etc.). Typically they create project files and send them out to the CNC computer (windows 2000) for the shop to run them on the machine. Ran into an issue where suddenly no one could talk to the CNC computer or each other. I essentially put them all on a new homegroup and everything is 95% going. For now, no one can access the files on the CNC Windows 2000 computer. The windows 10 computers request a login (username / password) which won't work. Windows XP shows a "XXXX is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions." I'm betting it's a security/permissions issue. I can't find anything else to change to "allow access". Any thoughts? Windows 2000 is trash to me and I'm not very familiar with it. I've googled and searched for about 5hrs trying to figure it out. No luck. We do know for sure it worked just fine before.

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3

Hey, When testing with a built-in NIC on a MacBook or Windows PC, I'm finding I can achieve 850+ Mbps on a 1 Gbps AT&T broadband connection, however when using a USB-C gigabit adapter on a MacBook Pro 2016 or newer, I'm seeing 150 to 400+ Mbps down, yet 850+ Mbps up. Using either a Thunderbolt 3 dock with a gigabit NIC, or the Apple Thunderbolt 2 gigabit adapter with a Thunderbolt 2 to 3 adapter, achieves 850+ Mbps. The laptops in each case are connected directly to the ISP router, and I've made sure to limit any background processes, like Dropbox or iCloud syncing. I can repeat this across other MacBook Pros with Thunderbolt 3 ports.

Wireshark shows some anomalies, and I suspect fragmentation, yet making changes to MTU and MSS have made no difference. Speedguide.net show the MTU and MSS set properly, so I feel good that I shouldn't see fragmentation.

When running iperf3 I see retries in the summary, and I can ultimately achieve the speed I need, but it takes many sessions running at a time to see the speeds.

Googling anything like this delivers way too many hits to find anything useful, so I'm turning to Reddit to see if anyone else is experiencing this, and how you've addressed it.

It's driving my crazy -- I can't be the only one. Is anyone else seeing the same?

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1

Today i make scan by Shield Up and it find two open ports 443 and 80 how to hide it (on Dlink Router). Also i have question it is possible to off ping like in linux for revent port scaning.

5

Good afternoon!

I'd like to ask you for a quick help here, please.

Here in my job, we have 4 "major" networks: 3 separate servers without internet connection and 1 whole network with internet connection. About some months ago, we couldn't needed an specific password for an external FTP and the network admin (yes, 1 guy to control all 4 major network) asked me to access this one FTP so he could see the password while the data travels from my station to the server/routers/etc and then to the internet. Basically, from my humble point of view, I should type the password (let's say "1234") and he would grab this data and 'translate' it to human language so he could see it as "1234" and not 01010101.

Which program can do this (read and translate the data)?

Thanks in advance!

OBS 1: yes, the net guy could just ask me but he is kinda show-off and, as I don't know if it was possible, I thought that it could be a good oportunity to learn a bit about this

OBS 1: sorry for the bad english

3

I’m torn between those two. I’m interested in WiFi range coverage throughout the house I am living in. I’m also interested in speed itself. How well it should deliver at top speed as stated. I have 300/300 internet plan I like the Nighthawk XR500’s features such as geofilter and another features. I also like Orbi’s WiFi mesh so I can walk around the house with ONE SSID.

So which is better? Does anyone have experience with those two and comparison?

Thank you!

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2

Hi everyone. Long time lurker to reddit in general but find myself in need of help and advice so finally signed up. I have a school project due in a few days and am looking for any help/advice to help me get the best mark i can. My knowledge is probably way lower than most in here, and i dont want it to get too complicated but hoping to get the best mark possible with the ability i have. At the moment i feel like i need to be pointed in the right direction before i can get started really, and im sure once i have started i can take it from there.

Ill give a basic description of the project brief and if anyone can help me it would be greatly appreciated. At the moment i just want to see if im thinking about things the right way or if im way off. Anyways im probably yapping too much already so here goes.

I am to design a network for a small business with 3 separate departments. Sales, Distribution and Marketing. Each department has their own office space, with 3 employees in each department. Each team member is to have their own networked PC with private file storage, each department has a team leader which has access to ALL files within their department including private files of their department's staff.

So in my mind its looking a little like this:-

Sales Department - 3 PC's, Printer ------> Switch

Distribution Department - 3 PC's, Printer -----------> Switch

Marketing Department - 3 PC's, Printer --------> Switch

Director of Company is to have his own networked PC in his private office, with his own printer, and access to every departments files, complete access.

So director - PC, Printer -----> Switch

So would a single router be enough or would i need to incorporate multiple routers? There is to be file servers, print servers email servers and web server to run the website. I was looking at running 2 servers, one solely for web and the other to handle file, print, email etc.

If im thinking about this all the wrong way please let me know. Ill leave it at that for now to see if i get any response, but obviously im looking at vlans per department and need to make sure i do enough to achieve the best mark. Thank you kindly for any responses.

1

Hi Everyone,

I am trying to monitor the performance of clients in my entire wireless network before and after I make some adjustments to the network.

Ideally, I'd like to capture all client traffic for entire network, but could be happy to just collect data from a specific WAP.

What is the best way to capture all this traffic?

What filters in WireShark would be indicative of network performance?

Anything else I should be considering?

Thanks for your help!

1

Hello, I'm doing a project for a course where I have to use Microsoft Windows ISS service to host a webpage where only people from our internal network should be allowed to connect to with Basic Authentication connected to Active Directory. I want to set up a VPN so I can connect this server from the internet to our Windows domain which is on another server not locally connected to the first one.

However... our teacher has given us equipment that we have to set up to a switch which we have to get a DHCP address and gateway from. Not only does this take loads of time and make the project much more difficult but it also means that we're given Class A IP addresses on a /23 subnet and there's at least 2 other routers behind the switch which I don't have access to and that also means that I can't route these requests through the routers.

This means that I have 1 public IP address to work with (the webpage server). Isn't what I'm supposed to do a thing that's impossible to do considering that I have no public IP-address to our AD-server?

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2

My internet provider is TWC and I have the 100mbps plan.

I just brought a new Cat6 ethernet cable. I also have a Cat5e ethernet cable right beside me which I alternated between to test speeds, but to no help, I ultimately get 8-10mbps speed wired.

I know it isn't my modem because I have done the speedtest on my mobile devices over wireless and they're getting 100mbps+.

What's the issue here? Or am I getting any information wrong?

Edit: I can also check using a wired connection on another computer or device to see if it's actually my computer as well.

6

I was asked an interview question on the following scenario. how will I connect a thousand routers in a row between 2 pc? I have to ping between the two pc without any error. As far as i know , a max of 256 routers can be connected in a row due to ttl value expiration. What is the answer to this question?

1

Hello all, I have a Dlink 2750U ADSL Router. My PC is connected to it via ether-net cable. Phones, TV are connected using Wifi. My TV is LG UJ652T.

I want to stream content from my PC to TV and other Wifi connected devices, other way round as well. Screen mirroring works flawlessly between my phone and TV, but I'm not sure whether its using router network or TVs own network.

Is screen mirroring possible between PC and TV, so I can play games on big screen without physically moving my case near TV? Do I need to configure my router somehow?

This is my configuration. Thank you.

Edit: Apparently, it uses TVs Wifi Direct feature for screen mirroring between phones and TV.

Windows IP Configuration

   Host Name . . . . . . . . . . . . : Excalibur
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : E0-D1-2E-03-4E-5F
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe82::e534:f43c:bcbd:9599%2(Preferred)
   IPv4 Address. . . . . . . . . . . : 190.168.1.11(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : fe40::1%2
                                       190.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 48289232
   DHCPv6 Client DUID. . . . . . . . : 00-02-00-04-22-17-4E-B2-E0-D5-5E-05-8E-3F
   DNS Servers . . . . . . . . . . . : fe80::1%2
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 1:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2051:0:9d38:60d7:817:36d9:49c4:279f(Preferred)
   Link-local IPv6 Address . . . . . : fe80::817:36d9:49c4:279f%12(Preferred)
   Default Gateway . . . . . . . . . : ::
   DHCPv6 IAID . . . . . . . . . . . : 117448583
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-22-12-4E-B2-E5-D5-5E-05-8E-3F
   NetBIOS over Tcpip. . . . . . . . : Disabled
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1

Hi Everyone. I am having difficulty trying to figure out why when I am connected directly to my TP-link internet switch, I suddenly get much slower download speeds and network disconnections.

I have full 1Gbs Internet service from Bell. My house has ethernet running to all rooms in my house from a patch panel in the basement. Each room only has 1 ethernet port. I would like to extend the ethernet port in each room for multiple devices as running another wire would be very difficult. In the main office, i have a PC, printer, Xbox and set-top Tv box that I would like to connect.

The main set up is ISP router. Ports 1,2 & 3 on the router go to rooms 1, 2 & 3 on the patch panel. Port 4 on the router goes to TP-link switch. TP-link switch port 2,3,4 & 5 go to rooms 4, 5, 6 & 7 on the patch panel. Office is in room 1 which is connected directly to ISP router and not the switch. The office only has 1 ethernet connection. i get full 1Gbs connection on my computer when connected directly to the wall jack. When I try to add a switch in the office in order to expand the ethernet port so that i can plug in multiple devices to the network, I can no longer get full 1Gbs connection to my PC and can only manage 50mbs at best. Also, Xbox and other devices experience the same reduced speeds. When I plug the PC directly back into the wall jack, I get full 1Gps speeds. For some reason, the switch in the office...not the one in the basement is slowing everything down and causing multiple disconnections and connection issues. I've searched everywhere but I have not seen an answer to my scenario. All cables are good and the NIC is set to auto....there is no full duplex option.

Thanks

4

Hi!

I have a stupid question :) And excuse my english, this is not my primary language.

I want to be better at networking, spesifically vlan, routing, switch config, ip adressing, tcp/ip, ospf and the list goes on.

Have you guys got any tips of what i can do to learn better and faster? Is there something like a switch simulator, network simulator of some sort out there? I am considering me as an advanced beginner, if that makes sense. I do know how to configure a switch, create vlans and so on, but i want to understand it, what lays behind all that, not just do it. As i said, this might be a stupid question, and maybe it's the wrong subreddit, but i gotta start somewhere :)

2

I have a website that allows dynamic subdomains. Everything works as expected with the following DNS records. However, 'www' keeps coming through as if it were a subdomain. What I would like it to have is www.mydomain.com just go straight to mydomain.com, and not pass the www part to my application. Would I need to do this with nginx configuration, or is it better to do this with DNS records?

mydomain.com A 123.123.123.123

*.mydomain.com A 123.123.123.123

www.mydomain.com CNAME mydomain.com

I am using AWS Route 53 if it matters. Thanks for reading!

2

I have own a Netgear Nighthawk router for one year and for a few weeks ago it started to shut down. I can only see the 5Ghz band and not the 2.4Ghz, and Im getting very very slow speed when Im connected. When I connect me directly to my fiber converter I get my paid speed 500/100. But when I go thru my router I get so slow speed so I cant access a webpage.

I bought the Netgear Nighthawk router to not get these problems but now I got it... Anyone that have any suggestion to how to fix the problem?

Thanks!

1

hello, i was always interested in optimization of networking in my home and same for my computers. i recently got myself a new pc which is really fast and i wanted to improve my latency by tweaking the network adapter intel i219v firstly i wanted to know is it worth tweaking settings since they are mostly designed for servers? secondly how can i confirm that my changes had a good or bad effect on my latency other then playing a game or sending out pings to various sites and last but not least is there any official documents about my specific adapter or a rule of thumb what you should do in my case without screwing something up not that im scared of it since i can easily recover the default settings.

3

Hello. To all.

I think my enterprise network is not working well. The Gigabit network don´t give me good speeds on my windows computers.

I want to put two laptops with iptraf or a windows soft alternative, in orther to check some cables, or some fiber .

I see my switches trought snmp and don´t see any "bottleneck", i think that can be some cable in bad conditions join mi switches.

Any recomendation?

Regads.

1

This is only on my laptop, I notice there are many with similar problems, but can't find solution for me. Just bought a new asus router and card, works great on my desktop, but on the laptop it wont go over 6mbps download. I have 100/100. Any suggestions?

1

Hello everyone,

I'm getting fiber internet installed for my home, completion in about a month or two. I'm currently on DSL and we are supposed to get 1 GB speeds, so it's quite an upgrade. When I was in the northeast I just used whatever Modem Comcast gave me. However, I'm curious about if I should buy my own modem for this faster internet instead of using the one supplied by the ISP, Cox. Additionally, what are some good ways to extend the network? I currently have a range extender but I'm not particularly happy with it and I'm thinking about using a mesh network but I'm not sure which one to get.

TLDR; Getting Fiber Internet (1 GB speeds)

1) Should I get my own modem instead of using the ISP, Cox, supplied one?

2) What mesh network should I look for with these speeds?

1

Have an ASUS RT-AC68U AC1900 router.

Buying a wifi adapter for desktop.

Was going to buy TP-Link Archer T9UH AC1900 because best reviews and cheaper. But should I buy ASUS USB-AC68 Dual-Band Wireless AC1900 instead.

Will beamforming work between the Asus and TP-Link?

Would the ASUS proprietary implementation ASUS Radar make any difference in quality/speed if I used both from the same brand?

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0

My computer updated and now it says "No internet Access" "Your device is connected but you might not be able to access anything on the network. If you have a limited data plan you can make this network a metered connection or change other properties" what the fuck do I do? My phone still works tho

2

I'll start off by saying that I have very little knowledge of this subject so please stop me if this doesn't make any sense.

I am currently living on a college campus that has a username/password system for wifi, which means that Google Home can't connect to it.

If I could use my computer to spoof the mac address of the Home and log in there, would the Google Home then connect to the network without needing the username and password?

Or is there another way that would be able to connect my device to this network?

Thanks

2

Not 100% sure if this is the right sub but...

I play online on my PS4 almost every night after work. Sometimes everything will run smoothly, other times my ping maxes out to as high as the game will read and remains totally unplayable. Everything has been running smoothly after picking up a $60 TP-LINK Archer C59 Dual-band router at Walmart. I live in a 4 story house including basement and I live in the attic on the fourth floor and two of my roommates live in the basement so I have to connect via Wi-Fi. The router is located on the 2nd floor next to the modem and cannot be moved. On average there are about 7-10(was about 11-13) devices connected to the network at any given time(about 4-5 are cellphones and are generally streaming youtube cause they're kids and at least 1 roku streaming netflix, 1 PS4 normally playing Fortnite cause they're kids. I adjusted my QoC settings for the router to prioritize my PS4's connection as well as forwarded the ports, I did this about 5-6 months ago and haven't touched them since. and unfortunately, purchasing a better and more expensive router is out the question since funds are LOW. Also Wiring in directly is out of the question since I'd need about 300 ft of Ethernet cable and the homeowner/roommate doesn't want it running throughout the house.

My main issue: I get on around 10pm and sometimes(7/10 times) I won't be able to play because I constantly lag out of party chat or won't be able to connect other players in-game parties and in-game i'm obviously just all over the place. So I'll reset the router for the first time and it'll be fine for about an hour but it'll start lagging out again randomly, and i'll go onto reset the router multiple times throughout the night and sometimes resetting doesn't even help. But about a month ago, this wasn't happening. My connection was always fine and I never lagged, but nothing at all has changed. Nobody has any access to the router settings except me literally everything is the same! Actually, there's less devices connected to the router now but I have no idea how that would have a negative impact. I know it could be some sort of interference from neighbors and i'm going to try to see if I can change the frequency and see if that helps any. I've done a little bit of research into boosting a wi-fi signal aside from purchasing an extender/repeater/etc and I found a DIY aluminum can booster and DIY foil boosters that'll boost your router about 5%, do these have any legitimacy? What could have cause my connection to become so unstable and what can I do to fix it or locate the source of the issue?

2

I've been searching the web for a while and can't come up with any quality source for a breakdown of how IPv4 addresses are allocated (broadly). I know a portion of them are reserved (RFC-1918, RFC-3927, RFC-3330/5737/TEST-NET-[1-3], RFC-5735, and 0.0.0.0/8), some are allocated to businesses, and some are allocated to individuals or home use.

Is there a good source for getting a rough estimate of how the IPv4 address-space falls into each of those buckets?

Thanks!

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