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

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8answers
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How to debug slow network pings

Our hosted servers are experiencing periods of very slow network access. During these periods pinging from any of our servers to the default gateway results in ping times of up to 500ms (instead of ...
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2answers
9k views

Lost connection to MySQL server at 'reading initial communication packet', system error: 0 with windows

I found similar questions but none of them helped me with a windows machine. I originally posted this on stack overflow but it was suggested that I ask here. I was able to connect to mySQL through my ...
1
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0answers
4k views

How to execute a reverse “Powershell shell” using ncat or netcat?

I am using ncat to execute a reverse "cmd" shell from one machine to another and without any issues using the commands: In my machine: ncat -l 443 In the remote machine: ncat <my ip> ...
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1answer
1k views

Outgoing IP Packet Capture and Logging with iptables

My goal is to use ipset lists in iptables to log outbound traffic to certain IP addresses. I intend to monitor an entire network passively. I have port mirroring enabled and the port mirrored ...
3
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2answers
10k views
+50

How virbr0-nic is created?

How can I create a virtual network interface like virbr0-nic? I am trying to find a way to create a NIC like virbr0-nic but everything which I can find on the Internet is how to create an interface ...
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1answer
50 views

Set default route to virtual ip

I have a Virtual private cloud running on 10.0.0.x. In this network two machines share a virtual ip to provide HA and connection to the internet via aaa.bbb.ccc.164. There configs are: Proxy1: ...
2
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0answers
8 views

Manually specify a tunnel gateway for an IPSec VPN Connection (ASA)

I have currently got several VPN's on-premise that are setup on the outside interface and using the default gateway on the interface as an originating source of the VPN tunnel. Although the outside ...
1
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2answers
2k views

No Ping/Telnet connection between VM

I am new in Azure and have one problem which I can not solve. I tried asking on StackOverflow, but - quoting - "You will have better luck asking on ServerFault". I want several Virtual Machines to ...
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0answers
24 views

Cable management in HP branded networking racks

I have HP 11842 racks (H6J69A) for networking equipment. Does anyone use those in their datacenters? Some advice for cable management inside the rack would be highly useful. Photos from existing ...
0
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1answer
16 views

systemd-networkd not recieving DHCP IP in cloned container

I am trying out LXD, and created a barebones Arch Linux image from scratch. It works perfectly the first time the image is used, but cloning the container or reusing the image causes networkd to not ...
0
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0answers
21 views

cannot connect to switch

I've been out today and bought a USB to serial cable and I was going to get a female to female db9 (rs232) but they advised I get a gender changer (female both ends). However when attempting to use ...
0
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0answers
23 views

WiFi high latency [migrated]

I got some problems with my WiFi setup. In my setup I use a Macbook Pro and a TP-Link WR1043ND v1 (OpenWRT). WiFi Channel is set to 6 (already tried other channels and 20/40Mhz width) If I ping my ...
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0answers
20 views

MySQL - Error Reading Packet From Server - Adding new slave to replication environment

I have a working application, currently using MySQL, 1 master, and 1 slave. Everything appears to work fine with replication. I am using WAMP Server 2.5 (Windows) MySQL v 5.6.17 I have followed a ...
-3
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0answers
10 views

VSphere connect guest os to internet

Having a VSphere 6 host which is installed on machine in our private network. VSphere 6 host IP is 192.68.0.40. Our getaway router to Internet is on 192.168.0.1. I can connect to VSphere 6 host from ...
0
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0answers
23 views

Forward all traffic when connected to a hub

I have a Ubuntu with two NICs. eth0 is connected to a hub and eth1 is connected to Internet. eth1 is used to do a point to point VPN using openVPN. So I have a tun0 interface. the VPN tunnel endpoints ...
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1answer
1k views

Multiple Homed Windows 2008 Server / Windows 7 Client

I have a small Windows 2008 network, with some Windows 7 clients. The clients are both laptops with docking stations and I would like them to communicate with the Windows 2008 server (for filesharing) ...
0
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0answers
10 views

Intel S5520HC - onboard NICs U/S, but also an addon QP card?

All We have a server with an Intel S5520HC motherboard, two E5620 processors, 6x2GB memory modules and four 1TB hard drives in RAID 10 connected directly to the board. I'm trying to be as detailed ...
1
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0answers
26 views

Very bizarre Linux-to-Linux but not Windows-to-Linux packet loss over the Internet

I am right now getting additional grey hair fighting a phenomenon concerning packet loss between machines on the Internet. Check the diagram below. Note that whenever I use "SSH" I could use "HTTPS"; ...
0
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2answers
56 views

Inter VLAN Routing Issue

Here's what I have setup 3 Networks across 3 switches (3x C3650) 10.7.64.x/24 (Vlan 7) 10.10.10.x/24 (Vlan 20) 192.168.1.x/24 (Vlan 15) The switches are all connected to each other, with Switch ...
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0answers
26 views

Ubuntu 14.04 Can Access LAN but not Internet (Verizon Fios)

I have been struggling with this for quite some time. I am away from home a lot and have an Ubuntu 14.04 server (SSH, HTTP, Transmission, Plex) running with the proper ports forwarded through my ...
0
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1answer
1k views

For a switch using RSTP (or MSTP) on which port states/roles does it send BPDUs?

In trying to wrap my head around MSTP and RSTP I have read conflicting information about which ports a switch will send BPDUs through. It is clear to me that for MSTP the switch sends the BPDUs needed ...
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0answers
15 views

Static ips aren´t working in ubuntu virtual machines

I want to set a static ip to a ubuntu vm client and other static ip to other ubuntu vm server. Im doing this like this: sudo gedit /etc/network/interfaces Then in the ubuntu vm client file: auto ...
-1
votes
1answer
44 views

Setting up a WiFi network in a Museum

I have to build from scratch a WiFi network in a museum(not too many guests at a time, but school groups of around 30 ppl are frequent). The building is mainly a big hall (4 stories high, the size of ...
-1
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1answer
24 views

Can't login to internet through browser [on hold]

So for my home internet I can go into a browser and type in my IP and get access to network setting. Well I figured I would try this at my school and see if I got the same results. So I got the IP but ...
-1
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1answer
35 views

How to add IPv6 /64 block to lo (local) interface permanently

I'm using this command line to add /64block IP range to lo network interface. ip route add local 2001:bc8:1234:abcd::/64 dev lo But, when I'm reboot my server. It requires again to execute that ...
-1
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0answers
11 views

Cloud based office network [on hold]

Is it possible to have a cloud based company network? Presently our small company uses a workgroup with shared folders and the like. We would like to set up a network with that provides domain ...
-1
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0answers
26 views

Is it possible to run two separate IPs through one line? [on hold]

I'm not asking if I should, just is it possible. Here's what I have: Old Internet provider has a 2 year commitment. But their line sucks. I'm literally paying pennies for it, but I decided to ...
-3
votes
1answer
27 views

How to open shared folder with administrator previleges

Using windows 7. I am administrator. I want to open folder that is share and I am able to Open the folder if I am logged in. Now if Some user is logged in and I want to open that folder from that ...
3
votes
2answers
1k views

Winbind/AD: Local users with identical AD usernames

We are getting ready to add Winbind/Samba to some CentOS servers. Identity Management for UNIX is running on our DC, and it's testing well so far. There is one scenario I'm having trouble with, and ...
1
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2answers
2k views

Unable to ping multicast IP

Let me prefix this by saying I'm not entirely clear on how multicast works. I have the gist of it, but not the underlying functionality. A customer has configured a RHEL6 cluster between two Jboss ...
2
votes
3answers
989 views

Loopback Device Not Configured On Boot

My knowledge of network interfaces on linux is limited at best, so I was hoping someone could help me figure out the best solution to a problem I have inadvertently caused. After boot, the loopback ...
2
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0answers
24 views

Get-WmiObject Win32_PerfFormattedData_Tcpip_NetworkInterface results in 'Invalid Class' error

On of my Nagios plugins to monitor the network load gives me problems on one Windows 2008 R2 server (out of 600). You can download the plugin here: ...
1
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0answers
32 views

Multiple IPv6 addresses added to interface, now IPv6 not working on my server [duplicate]

I got /64 IPv6 block from my server provider. When I add few IPv6 addresses (maybe 10 or 20) to network interface. Everything works fine about IPv6 network. When I'm added above 500+ IPv6 addresses ...
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votes
2answers
42 views

what makes two networks different? [duplicate]

When can we say two networks are different from each other? Is it when they have different subnet masks or when they use different policies? Will it be right to say that a router is needed to connect ...
4
votes
1answer
1k views

NFS mount mounted inside another NFS mount disappears randomly

I have quite an odd issue where my nested NFS mounts just disappear randomly from time to time. The fstab entries look somewhat like this: nfs:/home /home nfs ...
0
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0answers
40 views

Cannot connect to VPN [migrated]

I am not able to connect to my vpn using the built-in Windows 10 Pro x64 VPN client. I am out of ideas. When I try to connect I get "A connection to the remote computer could not be established, so ...
-3
votes
1answer
45 views

how to make server visible from internet [on hold]

I have ADSL router with Static IP from my Internet provider. I know that, if I connect my server to router it can be visible from internet (working webserver etc.), but how does clients getting page ...
2
votes
4answers
19k views

(network unreachable) error in my server logs

I'm getting lots of network unreachable lines in my Centos' messages log file. They seem they can't resolve to certain addresses which I do not have any ideas why my server has to resolve to them in ...
0
votes
1answer
29 views

port forwarding by iptables failed

I hope to forward from 192.168.1.230:9090 to 192.168.1.231:8080. I execute the following command: iptables -t nat -A PREROUTING -d 192.168.1.230 -p tcp --dport 9090 -j DNAT --to 192.168.1.231:8080 ...
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0answers
2 views

YAST is trashed and wirless networking stopped [migrated]

Running openSUSE 12.2 Mantis for some time with no problem until now.It will not load up wireless network and YAST appears trashed, with this error message anytime I try to fix it. "terminate called ...
1
vote
1answer
3k views

Error while bringing up eth1

I'm getting this error while bringing up my network card: (process:2550): WARNING **: _nm_object_get_property: Error getting 'State' for /org/freedesktop/NetworkManager/ActiveConnection/3: (19) ...
-1
votes
1answer
17 views

sharing more VPN connections on several computers in LAN [on hold]

my LAN looks like this: router 192.168.0.1 router (default gateway, connects whole LAN to internet) pc2 192.168.0.2 Linux pc connected to external VPN No.1 pc3 192.168.0.3 Windows pc connected to ...
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votes
0answers
8 views

home and vmware lab on same subnet (AD) [migrated]

I have a question about network topology. Namely, I wanted to set up a cluster vmware for testing SQL Server: fail over, always-on etc ... But I do not know how to reconcile this with your home ...
1
vote
1answer
41 views

Guest VMs cant reach each other on Different ESXi Hosts in Datacentre

I have two vSphere EXSI 6 servers both setup with the same vSwitchs and connected to the same physical switches Server 1: eth0 => vlan143 (mapped to CORE/Management vSwitch) eht1 => vlan140 ...
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0answers
31 views

SYN flood on mysql server

Consider this structure: DB <-TCP3306- WEB{1,2,3,4} All servers are CentOS 6/7 Web servers are running PHP (using php-fpm) that connects to the MySQL server. Occasionally, I get this error ...
0
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1answer
24 views

How do I host a registered domain with bind9?

I'm already hosting my own web server, FTP, etc. and I want to be able to link my domain name myself directly instead of configuring all subdomains and redirections on the registrar's DNS. Is it ...
4
votes
1answer
3k views

Unable to make work both private and public ip network on openvz container in Proxmox

I'm using Proxmox 3, it is a fresh installation. For those who know, I'm using OVH Vrack 1.5 (along with a previous Vrack 1.0). My server has two interface eth0 and eth1, I succeeded to configure ...
14
votes
2answers
1k views

Virtualization - Ten 1Gbps links or one 10Gbps link? (Performance)

I have a machine that has several VM's (5) and 3 physical networking cards (with each 2 ports), with a total of six 1Gbps ethernet ports. I have a SPF-capable switch, having a total of 48Gbps ...
0
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2answers
2k views

how to change interface ip in ifconfig with /etc/network/interfaces

Hi everybody when modifiying /etc/network/interfaces, saving it and then executing ifconfig i can't see the modification i made..for example here is part of my /etc/network/interfaces: auto wlan1 ...
1
vote
1answer
3k views

Bringing the xenbr0 interface up on XEN under Ubuntu 8.04

I installed XEN on Ubuntu 8.04 using this tutorial but after I reboot with the XEN kernel, I don't have xenbr0 device. I see that network-bridge script runs and it creates peth0 device, but not ...