Questions tagged [networking]

Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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Troubleshoot intermittent router DNS problem

I'm hoping one of the many network gurus here can help me with a problem that just started to happen on our office network. We have a Linksys RV082 router; short description of the problem is that ...
gareth_bowles's user avatar
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Networking Software Testing - How do I use a proxy server?

Is there a free proxy-server service that I can configure my computer (Windows 7) to connect to the internet through? I'd like to test some networking software that we are developing between two ...
Brian Webster's user avatar
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Connect Win NT and Vista via switch

I have an old NT Server and a laptop running Vista and I need to get files off of the NT server onto the laptop. I have a little Netgear switch and was wondering how to allow them to talk to each ...
chopps's user avatar
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Monitor status of VPN clients

Is there any better solution than ping -t for monitor status of some VPN clients. I have set up FreeBSD router with fix public IP address for accepting incoming PPTP VPN connections. The callers are ...
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Can I make VM's accessible over VPN, but not LAN?

In the near future, my firm will begin hosting Terminal Services systems for a few business customers. The Terminal Services Servers will be VM's on one of two large VM hosts. To provide secure ...
Nic's user avatar
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How to split my windows network with the least pain?

I am managing what can only be described as the little network that grew. It began life with a linksys router, 3 windows machines and a dsl connection. Through the years, lots of servers, network ...
MikeJ's user avatar
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Communication between two unreachable hosts in a network

I needed to send a file between two computers which both have firewalls. A server, which is contactable, is available to coordinate the transfer. I know the server can act as a "proxy" between the ...
Ben's user avatar
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simple networking/routing question

I need server A to be able to reach server C (a mail server). server B can already reach server C and server A can reach server B. Is there a few simple steps I can take to add a static route to ...
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Create a private network between virtual machines running in multiple hosts using Virtualbox

I want to create a private network between virtual machines running in multiple hosts using Virtualbox. Linux will be used as guest operating system, and Windows in the hosts. How do I set this up ...
jassuncao's user avatar
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TCP/IP packet loss network testing (in context of PingPlotter)

My question may be pretty basic TCP/IP / router based, but I need to couch it in terms of a Winpcap application pingplotter that I have used. One of the features I did use in my last place of work ...
polyglot's user avatar
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Any documentation for Surecom EP-824DX-CS? [closed]

I must find some documentation for a Surecom EP-824DX-CS (24-Port 100/10M N-Way 19" Rach-Mount Smart Switch) in order to find the capabilities of the device, but the most important is the console port ...
alexandrul's user avatar
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How can I Ensure communication between computers in unknown deployment environment?

I have two computers. One of them has a server running, the other has an application that communicates with that server. These computers are deployed to various sites. Sometimes these computers can be ...
Justin's user avatar
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Problem with samba shares / smtp server on local machine after apt-get upgrade

I have a pressing issue... I was silly and ran apt-get upgrade on our debian domain controller / internal smtp server and now the users (on WinXP & Vista) cannot access the network shares or smtp ...
Christian's user avatar
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IP redirect Lets encrypt

Here is Lets encrypt documentation regarding http validation: "Our implementation of the HTTP-01 challenge follows redirects, up to 10 redirects deep. It only accepts redirects to “http:” or “...
nischeruku's user avatar
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Digital Ocean Firewall Prevent VPN Client Connectivity

Info: I have the below setup, connecting my digital ocean environment to my local network. Using strongswan on the Network A gateway I've made a site to site VPN connection with my meraki on Network B....
Matt Campbell's user avatar
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Localhost Connection Throttled at 1Gbps

I am using mongorestore to restore a db to a localhost server on a Windows VM The connection uses mongodb://localhost:27017 Resource Monitor shows that the speed of the restore is limited at 1Gbps and ...
Marcus's user avatar
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iptables drop to keep ports silent with no response

I am working on the network telescope stuffs (AKA. darknet, black hole), which need to make the port take no response to outer traffic (ie. when other servers PING or send SYN requests, my server ...
Z4R1's user avatar
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Is it possible to configure a Linux/Ubuntu computer to be network silent?

I'm testing a customized network device using a Ubuntu computer from which I send network packets and check the actions on the network device. I'd like to only send over the packet I want, but since ...
fiedel's user avatar
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Using host loopback device into VMs

While deciding what IP address to assign to a local VM a question arose into my mind: why can't I just assign an address of the 127.0.0.0/8 net (so I can avoid any kind of IP clashing)? After all, it ...
Mega-X's user avatar
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Port Forward with dockerized OpenVPN-Server

So I am a bit new to the VPN stuff and am currently getting a little desperate. For what I want to do. I have rented a little server somewhere (static IP, Domain and everything). Now I want to run ...
thorald_'s user avatar
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Can I measure the performance of a linux software bridge using this setup?

I need to measure the performance of a linux network bridge (https://wiki.archlinux.org/title/Network_bridge) on a particular machine (machine A). My initial idea for a setup looked like this: ...
mortelsson's user avatar
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How can I connect two routers to the same switch

First of all, I'm not talking about those all-in-one routers that do wifi/switching/routing. It drives me nuts when people call a Wifi box a "router". Anway, I would like to do the ...
7wp's user avatar
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Print Infrastructure: How many LAN printers is too many?

I am a new network administrator for a larger company that is planning on moving to a new building. Currently I am working on designing a layout for each office, as well as the warehouse in terms of ...
Brendan's user avatar
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Why this physical interface does not have a VLAN-tagged subinterface?

Using our SonicWALL NSA 3600 and doing some cleanup, I noticed that one our physical interface, the X5, does not have a subinterface for the VLAN 7 (VoIP VLAN). Instead, it has the gateway IP of the ...
LeRouteur's user avatar
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What does 0.0.0.0/0 mean?

For example in an 'allow' statement in BIND or in Chrony config files. Does allow 0.0.0.0/0 mean allowing any clients or allowing no clients? My question isn't about the specific programs, but just ...
madacoda's user avatar
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How to isolate devices on a subnetwork? [closed]

I am an electrical engineer working for a university. Our network infrastructure does not allow static IP. Only DHPC devices can be connected to the wired network. I am responsible for an industrial ...
nowox's user avatar
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Error message in linux's dmesg: eno1: Detected Hardware Unit Hang

Could somebody tell me whats that error means? Is it serious problem or not really? Or how to diagnose it? Could that be related with my network? Seems that my router also got stuck in the same time. ...
Martin's user avatar
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Tracert consistently shows packet loss at same router hop

I read that a * means a packet loss in the tracert output. I ran the same command on the same IP 3 times and can consistently see a * on the same hop. C:\Users\jpnin>tracert sea.valve.net Tracing ...
leoOrion's user avatar
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iptables TCP Rules

iptables -t raw -F iptables -t raw -I PREROUTING -j DROP -p tcp -m string --string "Mozil" --algo kmp --to 65535 -m tcp --dport 1000 # You can change the port here iptables -t raw -I ...
Roberto Nervo's user avatar
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How do Wireless Security Protocols work? [closed]

For example, my home router use WPA2-AES as wireless security protocol. When I access a webpage, traffic coming from my desktop to home router will be encrypted with WPA2. However, when my router ...
Student95's user avatar
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ifup gives "misplaced option"

When I run ifup ens33, I get this error: /etc/network/interfaces:5: misplaced option ifup: couldn't read interfaces file "/etc/network/interfaces" the result when trying to restart network ...
Midhun Raj's user avatar
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2 answers
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TCP/IP: can i REMOTELY (via VPN) access mis-addressed device on remote LAN?

i sent a pre-configured box to client to drop onto their LAN. while i was sure i left it as DHCP, when i connect to the LAN through the VPN i'm not seeing it pull an address from the router and it ...
WhiteRau's user avatar
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1 answer
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How to control the connection while uploading to AWS S3?

Is there a way to control the connection while uploading from my servers to the AWS Storage? to be clear, Azcopy is so powerful to upload to AWS, so most of our bandwidth consumed and this is ...
Androboy's user avatar
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3 answers
64 views

Accelerate loading time in others countries by installing some kind of VPN? (What is it called?) [closed]

My servers are hosted in France (OVH) and my users are mainly from France. I am starting to have more and more users in Asia and North America, but some of them have huge speed problems : more than 3-...
lepix's user avatar
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2 answers
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Are we still limited by TCP Window Size when we want to fully utilize bandwidth from far away servers? [closed]

According to this website, as soon as round-trip time is increased, we lose a bit of our real-time capacity throughput to distant servers using default TCP Window size of 64KB. My network bandwidth is ...
Matuji's user avatar
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1 answer
396 views

IP replace default outbound [closed]

With these two commands I can set the default outbound IP, but how to make them persistent after reboot? # ip route replace default via 172.31.1.1 dev eth0 src 49.12.112.180 # ip -6 route replace ...
clarkk's user avatar
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3 answers
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Bash: Checking if can sudo on remote host using sshpass; how 'exposed' is the password?

I am using bash script below to test whether sudo is available on a remote host. I'm obtaining the password from user input. I understand (to a limited extent) that using passwords inside a script ...
algalg's user avatar
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1 answer
881 views

How can I force a nameserver resolution using the second nameserver on an ubuntu server [closed]

I try to download something from nvidia on a remote server via ssh. Iran is banned by the nvidia website. When I check the server dns, that is: IP4.DNS[1]: 192.168.20.14 ...
Ahmad's user avatar
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2 answers
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Can't ssh into EC2 instance once VPN client connected

I'm running Ubuntu 18.04.4 LTS server in a EC2 instance. I installed expressvpn client in this server (which I'm using regularly in my home servers without any issues). Once the VPN connection ...
Sudheera's user avatar
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1 answer
364 views

Windows Server 2019 - Hyper-V: 1NIC for server, 1 NIC for VMs

and thanks for reading! I have always been dabbling with networks and I am (very slowly) starting to understand them. I have at work a windows server 2019 which I am using to understand how networking ...
johnbell's user avatar
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1 answer
687 views

Cannot open https://www.rba.gov.au from Windows 2012 [closed]

We have an application that downloads https://www.rba.gov.au/rss/rss-cb-exchange-rates.xml daily to get exchange rates. It stopped working a few days ago, we found that above URL doesn't open in IE ...
SparedWhisle's user avatar
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2 answers
1k views

How to run several ESXi VMs that must have the same MAC address?

For various reasons I have to run a few (≈6) clones of the same virtual machine at my lab ESXi server at work and unfortunately the MAC address must not be changed between the clones. Changing IP is ...
LapplandsCohan's user avatar
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1 answer
207 views

How do domains connect to internet and email (servers) globally?

I know of domain name registrars, that you can use them to acquire your own domain name for a website; but, how do they connect to the internet and email (servers) globally? I'm not exactly sure how ...
Andrew's user avatar
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1 answer
200 views

Windows Server 2016 cannot RDP via backup connection without default gateway

I have a bunch of Windows 2016 servers on site at a client installation. The client has a single outgoing fiber connection and through some IPSec magic we can RDP into the server when we need to - no ...
Gerard's user avatar
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1 answer
70 views

What is a HAN in networking? [closed]

What is a HAN in networking, how does it work and when should I use one?
Han's user avatar
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1 answer
273 views

Tagged traffic throught FreeBSD server

i have a cable from provider with two VLANs on it, VLAN1 for internet and VLAN50 for VoIP. I need to take VLAN50 to my 192.168.0.2 server (PBX Panasonic TDE-600) on schema so it can connect to SIP ...
Bobi K's user avatar
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1 answer
820 views

Assign IP address for one computer within each VLAN

I have been asked if there is a solution to expose a single machine (Linux Server with honeypot installed) to multiple VLANs, I mean, a single machine will have many IP addresses belonging to each ...
RedS's user avatar
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1 answer
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IP/Packets Forwarding [closed]

I have searched a lot about IP + Packets forwarding but there was not enough information to find. Is forwarding only used in case of Virtual Private Networking or it has also other uses? if yes, when ...
Jwan's user avatar
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1 answer
70 views

How to expose a port+url visible to one machine to another

Essentially I have 3 machines: A, B and C A can see B (and vice versa) and B can see C (and vice versa). A can't see C (not part of the same network). I have access to A and B. Meaning I can start ...
George's user avatar
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1 answer
61 views

Two similar services, two IPs, one server?

I'm running a CentOS 7 box. On this box I have two services which should both be exposed using port 443 for HTTPS traffic. Using a reverse proxy is no option, one service cannot be reconfigured to ...
Robin Diederen's user avatar

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