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

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48 views

Windows Server 2012 and VM Ware Network, Host Cannot Ping Guest [closed]

I recently setup a home network so I can practice network administration at home to supplement my knowledge and improve my confidence in my programming career. I have been working out the kinks for ...
0
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29 views

Can IPv6 connectivity between countries be unreliable?

I’m setting up IPv6 on my existing VPS and backup server. The VPS is located in Fremont on Linode, and the backup server is located in New Zealand. I have several VPSs within the Fremont data center. ...
2
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1answer
148 views

CentOS 7 connectivity issues

I have a second CentOS 7 box that's having a lot of trouble connecting. Basically, we were running WHMCS, but a domain lookup kept failing. So the issue is IPv6 connectivity. [root@da01 ~]# yum ...
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2answers
62 views

Which Ports need to be accessible on a Domain Controller for Clients to logon?

We are currently segmenting our network. We will move the servers in another subnet than the clients. Of course the clients still need access to the domain controller to authenticate against it. I ...
0
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2 views

Linux Bridge (vmbr) has no connection to physical NIC [migrated]

I built myself a new home server and wanted to use Proxmox VE. Its Debian based and I have 3 KVM-machines running. Machine 1: "Sophos UTM" has WAN on vmbr0 and DMZ on vmbr1 (192.168.200.254) Machine 2:...
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1answer
42 views

Output multiple VM's to only 4 IP addresses ESXI [closed]

I have set up a computer as an ESXI environment. The system has 1 physical network port. When I create network ports on my virtual machines, each gets an IP address assigned by my router. I need to ...
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0answers
16 views

What are Gateway & Broadcast in Dedicated Server? [duplicate]

We recently purchased a dedicated server. When server details were delivered to us, we are given some more info along with the root login. Those are: xxx.xxx.xxx.24/30 - Network xxx.xxx.xxx.25 - ...
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1answer
29 views

What kind of emulator can i use to learn Cisco Router Configuration? [closed]

I am going through my CCNA materials. I came across this one topic called configuring the router. Now, i don't have a Cisco Router but i still want to go through the commands and see the results live. ...
3
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1answer
141 views

Windows server ignoring DNS resolution on private interface

I have a Windows 2012 server with two interfaces - public internet facing, and private. The private interface uses our internal DNS servers. This interface has no gateway. Static IP - not DHCP. I ...
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0answers
12 views

Systemd Networkd [Match] Rule Multiple Matches

If I have a static network configuration like this: [Match] Driver=mlx4_en [Network] Address=10.1.0.10/24 Gateway=10.1.0.1 DNS=8.8.8.8 and say I have a dual port NIC which uses the driver mlx4_en ...
1
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0answers
10 views

Why does reading /proc/net/tcp take a long time ss is quick to return the same sort of data about the connections table? [migrated]

On Linux 2.6.32, if you read (for example, cat) /proc/net/tcp, on a very loaded system (for example, a web server), you will find that reading 100K entries takes over 30 seconds. That's a long time. ...
2
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0answers
21 views

How can I find the docker-machine network adapter name for a docker container?

I would like to introduce network variability into docker containers. Specifically, I would like to be able to run commands such as: sudo tc qdisc add dev vethecb732a root netem delay 500ms 400ms ...
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0answers
22 views

Keyboard and Monitor not getting detected on HP Proliant Server

I am having an HP Proliant Server running Windows 2008 Standard on it. Since one day we are not able to access it remotely. So I have checked the server I can see all the lights and fan is running ...
0
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0answers
7 views

Monitor network traffic by FireQOS class?

I'm using FireQOS (which is basically an abstraction on top of the Linux tc qdisc mechanism as well as iptables) to classify traffic into different bandwidth classes. I can watch the bandwidth per ...
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2answers
102 views

How to setup failover with rabbitmq cluster with a loadbalancer like f5

I have been trying to find information on f5 developer central and internet regarding the following setup with no luck. We want to have a rabbitmq cluster with 3 nodes. 1 node will always be primary/...
0
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2answers
89 views

Linux block outgoing traffic to a specific ip without iptables

I basically need to run the following iptables -A OUTPUT -d 169.254.169.254 -j DROP except I cannot use iptables because the program is running in a docker container and I cannot use the --privileged ...
0
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1answer
21 views

Connecting two OpenVZ internal networks so containers can see each other

I have two OpenVZ Hosts with containers on them. This is the current layout: Host-A: (eth0 (connected to internet), eth1 (connected to Host-B)) Host-B: (eth0 (connected to internet), eth1 (connected ...
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1answer
91 views

Identify the ip to which an UDP port established connection

I'm trying to obtain the ip to which Rocketleague.exe has established connection on a UDP port. I've tried with netstat -p udp but for some strange reason it does not show any active udp connections . ...
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0answers
23 views

Client socket connection starts working only after being pinged by server?

I have a networked game I'm testing on a LAN. I'm using RakNet as my networking library. Generally everything works fine, but sometimes the client (an iPhone) seems to get "confused" when initiating ...
0
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0answers
33 views

How to prevent disconnection / reconnection attempts on private LANs without internet connectivity?

I am developing an appliance system which is meant to be transportable, used monthly in a different location, for ~100 simultaneous users, with laptops and tablets. The system includes a server (http,...
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2answers
49 views

How to use 2 IPs on one Apache server

I have two IPs (and domains) on my dedicated Linux server (Debian). I'm able to access the primary domain. But when I try to access the 2nd one, I'm directed to the primary site. In /etc/network/...
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1answer
45 views

Probable network issue despite healthy ping stat?

We faced a problem with a windows network where we suspect it to be a network issue although the ping works fine. System Overview: The Windows network is accessed from multiple sites connected ...
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0answers
29 views

Pinging (ICMP) Docker container on AWS ECS

I've got a script running in a Docker container that listens for ICMP packets. If you ping the container IP address, it picks them up and sends an email. However I'm having a bit of difficulty ...
3
votes
1answer
47 views

How to let chef listen on multiple IPs

I'm currently playing with chef to evaluate whether or not such a configuration tool might help us in our *nix-based environment. For the last few days I'm struggling with one problem I can't find a ...
0
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0answers
8 views

juniper netscreen-50 management access only when admin station interface in promiscous mode

I have just received a netscreen-50 Juniper and i am trying to configure it. On one interface, I have defined an IP address and an management access for telnet/ssh: set interface "ethernet1" zone "...
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0answers
51 views

Can we rely on docker virtual network isolation?

I'm building an architecture with docker. As everything is virtual I cannot see how to apply general concept like DMZ, firewalling and other network isolation method. When two containers are sharing ...
2
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0answers
57 views

How can one update BGP ASN on an Azure Virtual Network Gateway?

I have an existing Azure Virtual Network Gateway I'm attempting to reconfigure for use for BGP, per https://azure.microsoft.com/en-us/documentation/articles/vpn-gateway-bgp-resource-manager-ps/ . ...
0
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3answers
33 views

Have 2 different applications use 2 different ip's with the same port on the same host

I want to have an application running on x.x.x.x:80 and another one at y.y.y.y:80 on the same host. I have bought 2 ips from ovh and would like to know how to do so. I found these: Debian/OVH: How to ...
1
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3answers
75 views

Setting a static IP exactly as the dynamic IP yields loss of connection

Before I start I would like to point out that I do not want to get hung up on DNS issues with this question. EVEN IF DNS issues are apparent that would have nothing to do with basic IP traffic and ...
0
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0answers
25 views

How do you ensure outgoing requests use the same IP in a Google Cloud server cluster?

I have a cluster of Compute machines on Google cloud that are load balanced for all incoming requests. These servers need to be able to make a request to an Enterprise partner of ours who requires IP ...
2
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1answer
46 views

Recover GPO Rights

I messed up at work today, and I've accidentally denied a group (I don't know which one) from read-level permissions. I went to work on delegation for a user for a GPO, and I must have accidentally ...
0
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1answer
44 views

PfSense box not passing traffic between WAN and LAN

I just tried to insert a PfSense box into my network and I seem to have broken something in the process. Need some outside help to point out any errors I might have missed. The setup was working ...
0
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1answer
46 views

How do I create a subnet using the Google Compute Engine cloud console?

I am wanting to create a subnetwork as described here: https://cloud.google.com/compute/docs/reference/beta/subnetworks How can I do this using the cloud console? thanks
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2answers
72 views

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
52 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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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 ...
0
votes
1answer
28 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
54 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 ...
0
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1answer
84 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
64 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 ...
0
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0answers
25 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 ...
0
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0answers
24 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 ...
0
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1answer
21 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 ...
19
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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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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 ...
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0answers
26 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
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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 ...
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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 ...
0
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1answer
164 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
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 ...