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

learn more… | top users | synonyms (1)

19
votes
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. ...
0
votes
0answers
79 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 ...
0
votes
0answers
28 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/...
0
votes
1answer
60 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 ...
0
votes
0answers
20 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 ...
0
votes
1answer
170 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\\...
0
votes
0answers
62 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 ...
0
votes
0answers
21 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 ...
0
votes
0answers
39 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
votes
2answers
72 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
vote
1answer
30 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/...
0
votes
1answer
31 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
vote
1answer
40 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 ...
4
votes
1answer
69 views

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 ...
1
vote
2answers
115 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
vote
1answer
62 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 ...
1
vote
0answers
38 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
votes
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
votes
1answer
62 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 ...
0
votes
1answer
36 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-...
0
votes
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
votes
1answer
42 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
votes
0answers
33 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
votes
1answer
36 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 ...
1
vote
1answer
79 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 ...
0
votes
0answers
17 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
votes
0answers
21 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
vote
0answers
39 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
vote
0answers
24 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
42 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
votes
2answers
85 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
votes
1answer
30 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
votes
3answers
63 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 ...
2
votes
1answer
246 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
37 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
vote
0answers
33 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
votes
2answers
35 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 ...
1
vote
0answers
18 views

Sonicwall TZ205 with EnGenius ESB300 as Guest Wireless AP, Need to keep networks apart

I have a SonicWall TZ205 with an EnGenius ESB300 as a Guest Wireless AP. I would like to keep these networks segregated. Interface X0 is the LAN, X1 is WAN and the EnGenius is connected to X4 in AP ...
1
vote
0answers
23 views

Two users behind same NAT (PSK or EAP) - strongswan

I have a strongswan implementation and am running into an issue where when there are two users behind the same NAT, the second one "kicks off" the first one. I was able to resolve the issue using: ...
0
votes
1answer
29 views

Simultaneous outgoing connections limit with iptables not working

I run a website that technically acts as a proxy to another website (I make HTTP requests to it), and I needed to make sure not too many simultaneous connections were made, I thus limited it to 29 ...
1
vote
1answer
18 views

List network Docker

I was wondering if there is a docker command to list all the containers with their network? I know there is docker network inspect, but that's to inspect a network. I'm looking for a command that ...
0
votes
1answer
55 views

Windows RDP connection fails within 30-60 seconds of successful connection

Myself and several other users are having issues staying connected through an RDP session to one of our servers. Server lives in a subnet behind a proxy (cloud-based) Users connect to network via ...
0
votes
0answers
12 views

Can the VRRP ID of 2 different systems clash (keepalived and cisco/force10)

Since Keepalived and Cisco/Force10 both use VRRP, and use an ID Range of 0-255: 1) Would using the same number in the same vlan cause a issues. 2) Would using a different number in the same vlan ...
0
votes
0answers
18 views

No network on XenServer VMs

I'm trying to set up a CloudStack private cloud with advanced networking and I seem to have navigated most of the hard part. The problem now is my system VMs are not able to access the public gateway ...
-1
votes
2answers
60 views

How can I determine which network adapter is SFP+ in CentOS?

I have a server which has an SFP+ module. We are going to utilize this to get 10gb speeds. I have adapters em1, em2, em3, em4. How can I determine which adapter is the SFP+ adapter in Centos 6.5?
1
vote
2answers
144 views

Is it possible to use IPv6 in my local network if my ISP is using IPv4

My ISP is using IPv4 and assigns IP addresses via DHCP. Is it possible for me to use IPv6 in my local network/subnet, and if so is it even worth it to do so?
1
vote
1answer
75 views

Dropped packets in all Linux and Unix

I have a problem. I have a motherboard by Supermicro – X11SBA-LN4F. There are 4 ethernet ports. In the first port I connect to the internet. In the second port I connect to my local network. When, I ...
0
votes
0answers
22 views

limitation of 8 active port in LAG

i was going through Aggregation/EtherChannel topic and I got stuck in below statement "A dynamic LAG can have up to 16 ports of the same type but only 8 can be active at one time" any specific reason ...
0
votes
0answers
29 views

Linux machine gets different IP through and after installation

we have some automatic building of our building machines using packer (jessie, trusty, xenial, macos, ...) on separate network (VLAN on L3 switch which is used as default GW for the network). Till now,...
1
vote
0answers
20 views

Port forwarding from external providers in AWS VPC

I'm looking for general feedback regarding allowing external services access to your Amazon AWS VPC. I'm mostly wondering how other people go about doing this. If you're using an external service like ...