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

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single internet connection VS double internet connection

We have a two story building office and we are going to upgrade our internet connection. Is it better to have two separate internet connection with 15mbps each for first floor and second floor or just ...
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1answer
35 views

Sharing Folder In A Specific Group

Good morning, can someone help me on my problem? Windows Server 2008, and 16 PC, in windows server I g create a 4 group, and I add specific users into a group,. I shared a folder in windows server, ...
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0answers
51 views

Iptables firewall causing instability

I've made a script to set an iptables firewall,but it's Causing instability on the local network aplication . The firewall is droping the connection between the clients and the server for a while ...
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1answer
23 views

Why is outbound bandwidth on VPS much less than reversed inbound from same host?

I have a FreeBSD 10.1 VPS in Europe using the VirtIO Ethernet device that sees significantly smaller outbound bandwidth than inbound from the same distant hosts. This problem was originally noticed ...
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3answers
51 views

Why another PC on lan can ping me even when I use /30 subnet?

Here is the set up: PC A : IP address : 192.168.1.2 Netmask : 255.255.255.252 Gateway: 192.168.1.1 PC B : IP address : 192.168.1.220 Netmask : 255.255.255.0 Gateway: 192.168.1.1 PC B is able to ...
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1answer
76 views

Block DHCP server from other network

I have problem on PC's (Windows 7) with two network interfaces, sometimes nic that is supposed to be in network 10.1.19.0 has address from 192.168.0.0 My networks: 192.168.0.0/24 with DHCP running on ...
1
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0answers
59 views

Failed to bring up eth0; can't establish any network connections

So for 1,5 years now I was running a DigitalOcean droplet without any problems. did apt-get upgrade several times, changed some things - all fine! Last night suddenly all my alarms went off and my ...
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0answers
11 views

Decreasing boot time for Solaris 11.3

I'm trying to decrease boot times for Solaris 11.3. This is from a DL360 with 10K drives. Its the same machine that has the ACPI issues and lacks the BIOS updates. I'm seeing two issues I'd like to ...
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0answers
34 views

OpenVPN gateways configuration with non-routable addresses

I have to configure OpenVPN gateways with cryptographically protected tunnel connecting two non-routable subnet addresses. Mutual authentication gates on the basis of certificates. I used this ...
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0answers
23 views

irregular timeouts for new connections through vpn

We have some local servers and a VPN to our hosting partner where our production servers reside. From time to time (no "schedule" recognizable!) we can't connect to the production subnet: the vpn is ...
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1answer
16 views

Cannot access D-Link DES 3200-10 after resetting account

I've forgot my password and after googling I've found that in recovery mode I can reset my account. Connected to Switch using console port (VT100+ Keyboard compatible) and pressed Shift+6. I accessed ...
18
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2answers
1k views

What's the Wireshark packet receiving and processing procedure on a Windows machine?

I am about to use Wireshark for some traffic monitoring on my Windows computer. While working on it, I was wondering how Wireshark manages to catch low level network packets before Windows does. ...
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0answers
58 views

OpenVPN Server on Windows does not accept connections

I currently have a strange problem with my OpenVPN Server. I am using OpenVPN 2.3.11 on a Windows Server 2012 R2 Standard. The problem is that after a while (between 5 and 10 hours) after the OpenVPN ...
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0answers
15 views

OpenWrt - connecting WLAN and LAN at network level 3

I have a Linksys WRT54GL router with OpenWrt installed. I would like to create two independent networks, each with its own DHCP server: one WLAN and one regular LAN using the switch ports. My /etc/...
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1answer
52 views

How can I change the network adapter of a vm using a cli in esxi?

I want to change the network adapter of a guest virtual machine using esxcli, vcli or any other cli means. I couldn't find an esxcli command, which is expected as its scope is primarily the host. I ...
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0answers
19 views

Need help configuring a second VLAN on a managed switch please

Got a network using a Sonicwall and HP 1920 managed switch configured as follows: Sonicwall: X0 Interface - 192.168.2.251 X1 Interface - WAN Connection X2 Interface - 150.9.1.251 (Different Zone) HP ...
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1answer
89 views

OpenVPN Windows 10 Server, Windows 7 Client, can ping each other on VPN IPs but nothing more?

Server config: port 1194 proto udp dev tun dev-node MyTap server 10.8.0.0 255.255.255.0 ca "C:\\OpenVPN\\easy-rsa\\keys\\ca.crt" cert "C:\\OpenVPN\\easy-rsa\\keys\\server.crt" key "C:\\OpenVPN\\...
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0answers
57 views

Ping inconsistent but works just to different address

When I ping a static external IP address on my internal network it works half the time directly to the IP address but then half the time it is going to the router address first. Is there some things I ...
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0answers
20 views

A domain controller in Azure ends up public on the Internet with no firewall - is it compromised? [duplicate]

I'm helping a customer stand up an Azure environment and they decided to stand up a server (DC) on their own without asking for help. The only access method is supposed to be IPsec, but they forgot ...
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0answers
33 views

The Chrome browser can sometimes not reach Google servers with a new router

I have an odd problem which I haven't been able to even find mentioned elsewhere. A while back, I switched out the Wifi access points as well as the router for a small office network. After I did this,...
0
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2answers
69 views

Dual interface PC with one IP address

I would like to set up a machine with 2 network interfaces in the following setup: LAN1 <---> PC <---> LAN2 The tricky part is that the PC should be accessible from both LAN1 and LAN2 with the ...
1
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1answer
16 views

BSD nc (netcat) does not terminate on EOF

Host A: tar cf - stuff | dd | nc -N -l 12987 Host B: nc a.example.com 12987 | dd | tar tf - On host A dd prints its summary after tar completes. Thus it is clear, that tar closes the pipe/...
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votes
1answer
30 views

Can i use the Azure DNS Service for my private network(s)?

I have the following situation: An extranet with multiple internal network zones, with private ip ranges (10.x.x.x (subnetted), 192.168.x.x.x etc..). These networks are connected using dedicated / ...
1
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1answer
36 views

CentOS 7 machine lost connectivity after DDoS attack [closed]

We were testing the DDoS protection of a CentOS 7 machine but after it ended, the connection on the machine is just gone. The configuration of the connection is exactly identical to before the DDoS ...
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0answers
4 views

Routing/Redirecting Traffic from client to server to internet [migrated]

I am already sorry for what I am asking but I cannot find the right keywords for that. I got a server with git, homepage etc. Now I just installed openvpn and it works great (except for the part ...
4
votes
1answer
45 views
+50

No IPv6 connectivity from docker container

i'm having serious problems enabling IPv6 in docker. Environment The host is running Debian Jessie. It's a virtual Server (KVM). eth0 has a statically configured address like w:x:y:z::1 in a ...
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2answers
104 views

Linux change source ip adress of incoming traffic

I have a web service running on port X. It was never intended to run outside a local network, but I would like to access it over the internet. Therefore, I need to change the source IP address of all ...
1
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1answer
32 views

IPv6 and LXC connectivity

I am struggling a bit on how to equip my LXC configuration with IPv6 currently. What's the setup? Ubuntu 16.04 LTS LXC2-beta from the Ubuntu PPA's (feature IPv6 connectivity) I use a netcup IPv6 ...
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0answers
33 views

RDP Connection Times out Only When Connected over SSH Tunnel

I have an interesting issue. let me describe my setup: I have a server at home that serves as my Virtual Machine Host. All of the computers here are VM Computers, I don't think that makes a ...
0
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1answer
35 views

Possible to announce IPs through AWS?

I'd like to have additional IPs with my EC2 instances so I'd like to lease IPs from a 3rd party since Elastic IPs seem to be far more expensive. This would require me to announce the IPs. Is it ...
2
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1answer
51 views

VMWare ESXi trying to connect to IP on different subnet

Our VMWare ESXi host is sending VMWare Server requests (port 902) every five or so seconds to a private IP address that is not in the subnet. For reference, the ESXi server is on a Class B address ...
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0answers
16 views

ksoftirqd using up 100% of one core when using Netmap?

Observations: When netmap pkt-gen is run on one core and one thread: top shows pkt-gen using up 100% of CPU and ksoftirqd using up about 90-98% of CPU When netmap pkt-gen is run on two cores and ...
0
votes
1answer
35 views

IP Range - Subnet network configuration on CentOS 6.4

I have problems to configure an subnet /25 on an vps with CentOs 6.4 have tried different version. The original eth0 settings are: DEVICE=eth0 #HWADDR=de:8f:24:e9:7b:04 TYPE=Ethernet UUID=64e110dd-...
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0answers
22 views

Does guests see if the host network interface is down in Xen?

I am seeing that the DomU guests are not being able to see that the Dom0 network interface is actually down. Is this a normal behavior in xen? How can the guests track that the Dom0 interface is a ...
0
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1answer
37 views

IPv6 Subnet Delegation

I'm a bit confused on how to calculate IPv6 numbering. I have a /32 now and a VPN client that wants 6 x /48 from that /32. Could someone please simplify on how I can determine the points of the /32 ...
0
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0answers
32 views

Examining log traffic on ports 135 and 1433

I have a question about traffic from my logs that I'm not sure about. Occasionally I will get alerts that there is a large amount of traffic to either port 135 or 1433 (we do have a mysql server), all ...
-1
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1answer
35 views

Make SSH server to forward connection per user

Is there any way to force OpenSSH (or create a proxy of some kind) to forward one user to one machine and another user to another machine just by the username that he (or she) provided? I've got ...
0
votes
1answer
57 views

OpenVPN on an AWS instance breaks connectivity

Summary: I want to set up an OpenVPN server on an EC2 instance (Ubuntu 16.04). It fails to configure its interfaces after a reboot. Details: the image installs fine, reboots fine apt update ; apt ...
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0answers
14 views

De-authenticating Wi-Fi without turning off the device

I have established Wi-Fi access point using hostapd and the IP address is configured via DHCP. This is my configuration file hostpad.conf interface=wlan0 driver=nl80211 ssid=User hw_mode=g channel=...
0
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0answers
17 views

Strange traffic on my dedicated Kimsufi Debian 8.4

I own a Kimsufi dedicated server since more than one year, and recently I decided to completely re-install the OS. I installed Debian 8.4 Jessie. I installed all the updates needed, changed my SSH ...
1
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0answers
21 views

Can't ping my LXC container

I have set up a linux container on my server. The problem I have right now is that I cannot ping my linux container from my laptop, but I can ping the hypervisor. I created the LXC by using: lxc-...
1
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0answers
22 views

Internet connection repeatedly dropped [closed]

Quite frequently, some days every 15 mins for hours, on other days not at all, the connection drops. Often the connection comes back within 5 mins with no action taken. My setup is an Ubuntu server ...
-3
votes
2answers
40 views

ethernet cable configuration with possibility to connect one computer at the end or at the middle of the cable [closed]

I would like to know if this Ethernet configuration would work. ethernet configuration Of course, only one device could be connected to either socket 1 or socket 2. The cables between router and ...
0
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2answers
74 views

Configuration to connect an Acess Point into a pfSense Network

At the moment I have an wired network provided by my pfSense router. I bought an Access point (tl-wa801nd access point), in order to have a wireless network in my wired network. In my computer host, I ...
0
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1answer
29 views

Vagrant: inaccessible from host [closed]

I set my vagrant configuration to add Bridge networking to my VM. config.vm.network "public_network" When I try to use the assigned IP address that I got from ifconfig to ssh it says connection ...
0
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3answers
52 views

Connectivity between switches using SFP+

My office infrastructure is currently configured with HP Procurve switches. They are interconnected with 10Gbps fibre. All the SFP+ Ports are in use on all the switches. I am looking at buying a new ...
1
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1answer
184 views

EnableLinkedConnections isn't working on some Windows 10 machines

I have been using the "EnableLinkedConnections" registry setting below for years with no trouble. But lately with Windows 8.1 and Windows 10, sometimes it doesn't work. I need to run some programs ...
-3
votes
1answer
35 views

wifi only works when lan is connected [closed]

Hold tight, this is a strange one... I have a board with two network adapters, one lan and one wifi, each one properly configured and has its own ip address on the same network. Whenever they're ...
1
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0answers
22 views

KVM/libvirt: NAT forwarding virtual bridge to host bridge

I currently have a VM setup where only a few 'special' VMs are allowed to have outward facing IP addresses and the rest aren't. All of them are configured with two interfaces attached to a virtual ...
0
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2answers
25 views

Windows server 2012 can't access HTTP(80) Websites

I have a problem whereby my Server 2012 R2 server cannot access sites on Port 80. Server 2012 R2 Firewall disabled. Cannot communicate on Port 80 Can ping websites without issue Cannot Telnet to ...