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)

1
vote
1answer
1k views

vmware esxi host ha state in election

In my Vmware Esxi server 5.1 , 2 host machines which are added as cluster ,there HA state is turned to ELection .I tried Reconfiguring the vsphere for HA it is not working .In cluster it shows issue ...
0
votes
2answers
1k views

Traceroute doesn't reach gateway

i have problem with my opensuse 11.3 network. So, i've assigned ip 192.168.137.2 to it, and another computer (win7) with ip 192.168.137.1 On the opensuse, the gateway is the 192.168.137.1. and the ...
0
votes
1answer
138 views

ICMP replies - ingress or egress interface (e.g. from a traceroute)

When a traceroute is initiated and receives an ICMP reply from the nodes, which interface should the be replying be from according to RFC 1812. they are actually replying from ingress (where they ...
1
vote
1answer
3k views

Why does Server 2008 running SQL 2008 produce a FlushFileBuffer exception?

Hi I run 64bit SQL2k8 on 64bit WS2k8, and backup a database to a UNC file. The backup creates the file, copies the data, and when finishing, crashes. Backup database Infovest to disk = ...
0
votes
0answers
7 views

Route to Internet router from different subnet [on hold]

I ran into a situation where my network is setup like the following: my network In this image my Computer A is connected with WiFi DSL router which is connected to the Internet. Computer A and B are ...
2
votes
1answer
1k views

Route outbound connections from local network through VPN

I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via ...
0
votes
1answer
19 views

proFTPD unable to connect after update ECONNREFUSED

I am working on Debian 8 - ran a series of automated system updates and now I am unable to connect to my local server running proFTPD. I have made no changes to the client attempting to connect to ...
0
votes
0answers
12 views

Large payload - connection get's Hung with CLOSE_WAIT or LAST_ACK state

We have a webservice client which posts data to a 3rd party Webservice. We are having an issue when the payload is a bit large (Around 600KB) xml. Once we pay the process hangs forever. The Netstat ...
6
votes
3answers
24k views

How do I force Linux to reacquire a new IP address from the DHCP server?

The environment is Debian, although the answer will apply to all distributions.
3
votes
1answer
47 views

HP ProLiant BL460C Gen9 - NICs

Is there a way to get more than 4 physical NICs (4 active/4 standby) on an HP BL460c Gen9 server WITHOUT using mezzanine cards and extra VCMs? EDIT for more information: I have two c7000 enclosures. ...
0
votes
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 ...
0
votes
0answers
33 views

Multiple Gateways for Single Subnet

Right, this might be a long one, so bare with me... I have 2 machines, lets call them local1 and cloud1. local1 has 3 Nics: 2 connected directly to cable modems with public IPS (call them eth0 and ...
-5
votes
0answers
34 views

Win Server 2012: Keep Network mapped drive mapped at all times

I'm trying to get the backup working for valuable client data, I have a server that is hosting client data, and are using Microsoft OneDrive as a Mapped drive... But I think the task scheduler is ...
2
votes
3answers
1k views

Reach LXC container from a virtualbox guest on the same host

Context I develop websites on my Ubuntu laptop (Ubuntu 13.04 64b). Each site runs within a dedicated LXC container¹ on network 10.0.3.x I sometimes need to reach those sites from a virtualbox guest ...
-1
votes
1answer
38 views

How can I connect a group of vms in Azure?

I have a number of Azure Linux VMs. I am able to ssh into all of them using the public azure connection info, however I am not able to ssh from one vm into another vm using the private info. I have ...
1
vote
1answer
289 views

Diagnosing a 2-minute delay in HTTP GET request

Under narrow circumstances, I get a 100% reproducible delay of approximately 2 minutes when I request a public web page. The page in question: https://id.openjdk.java.net/console/login Splicing ...
0
votes
2answers
11k 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 ...
0
votes
0answers
17 views

LXC containers cannot connect outside of VM

I have two CentOS 7 LXC containers on a RHEL 7.2 VM using virbr0 as a virtual bridge. Originally, container1 could connect out and do e.g. yum installations, but after I created container2, neither ...
1
vote
1answer
136 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
1
vote
0answers
30 views

Possible to force TCP window scaling to a higher value?

Is it possible to increase the TCP window scaling factor on Linux (CentOS 7.2)? I have a long fat network (100 Mbps) from London to Chicago and I'm getting 16 Mbps throughput in TCP on an sftp from a ...
0
votes
0answers
13 views

Using the host inet address to connect containers

Running an Ubuntu 16.04 server as a docker host. One of the services I start has the following run script. #!/bin/bash # retrieving the inet address INET=`LANG=c ifconfig | grep -B1 "inet addr" | ...
0
votes
1answer
22 views

libvirt: set hostname using dhcp in virtual network

I've configured a host-only (aka private) network for a group of VMs on a CentOS 7 host. I've created static leases in the DHCP section for the virtual network. The IP address is getting set ...
0
votes
1answer
46 views

Network maps, best admin practises and how them saved your ass?

I am reviewing the security of a (quite large) network. There are a some thousands switches, several hundred routers, several hundred access points, tenths of FW, IPS, and so on. PCs and servers are ...
1
vote
1answer
3k views

“RTNETLINK answers: File exists” after upgrading to Debian 7

I upgraded my system from Debian 6 to Debian 7.3 yesterday. After rebooting, I chose the new kernel linux-image-3.2.0-4-amd64 and the network became unavailable. I tried sudo service networking ...
0
votes
3answers
2k views

vSphere ESXi 5.5 Windows Guest Network card not active after reboot

Problem: Windows 2008 R2 or Windows 2012 servers have no network access after a reboot Not all VMs affected, but multiple VMs and mulitiple hosts. Windows Network configuration shows the correct ...
3
votes
2answers
8k views

Windows Server 2012 Port Forward for Specifc Host

I am trying to have a specific host be redirected to another port when trying to access a service on port 80. So, when the client (192.168.1.22) requests a connection to the server (192.168.1.10) on ...
0
votes
0answers
13 views

Detecting Bots Who are sending Spam Mails via Webmail

I am working on spam Detection done by botnets. Some Information Recently,I came through a techique to detect the spammer in my network which is based on the anamolous amount of MX queries,outbound ...
1
vote
1answer
35 views

Slow file transfer speeds

I have a server that is running Ubuntu Server 14.04LTS and I am currently experiencing slow network transfer speeds. This server had been running without issue now for about 2 years and suddenly I am ...
1
vote
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 ...
1
vote
2answers
57 views

Can't ping between two VMs

I have two VMs that, up until yesterday, have been able to talk to each other just fine. Now they don't. I've been trying to get this fixed for several hours now, but haven't been able to figure ...
2
votes
1answer
3k views

How to force certain traffic through GRE tunnel?

Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ...
0
votes
0answers
49 views

IPv6 not working

I'm unsure as to why this is happening... anyway, let me start from the beginning The Setup 1 * Dedicated server with a /29 IPv4 and /48 IPv6 (from Nocix (DataShack)) 1 * CentOS 7 KVM host 1 * ...
0
votes
2answers
1k views

Unable to access different subnet

Router ip: 192.168.3.1 Windows server: 192.168.3.50 (WLan) and 192.168.2.1 (LAN) PCs: 192.168.2.x I am able to access 192.168.3.50 from laptop (in 3.x network) but unable to access through other ...
2
votes
1answer
85 views

Tune windows for high latency/high bandwidth tcp transfers

How can I speed up my Windows 7 tcp file transfers over a 100 mbps link between Chicago and London? Right now, I am transferring two 4GB files in two sftp sessions. Each file transfer is running at a ...
-1
votes
0answers
27 views

Port forwarding/ssh

I have a question about port forwarding. In my case - I need serverB to be able to communicate with serverA over port 9090. The problem is that serverB can't not connect to serverA over this port. ...
8
votes
6answers
7k views

Windows Server 2012 R2 performance for Mac OS X Clients (File Services)

I am inheriting a Windows 2012 R2 Server that is experiencing abysmal SMB/CIFS performance for Mac OS X Clients in particular. The server is doing file services and is an Active Directory Domain ...
2
votes
3answers
42 views

VisualSVN server visible on internet, but not all subcommands work on client

So my boss is a nice guy who's open to trying new ideas, and I talked him into letting me start new projects on svn (instead of an older version control system). At this time, we've realized that it's ...
-1
votes
0answers
8 views

Is Weave the only Docker overlay network that supports multi-hop routing?

One of the features of the overlay network Weave is the support of hop-routing. I couldn't find any other Docker overlay networks that support this feature. Not even Docker's native networking library ...
0
votes
1answer
47 views

How to secure dual-homed Windows Servers that are connected to the internet

We have two machines running windows server 2012. Both have one NIC port connected to the public internet and another NIC port connected to a switch with internal IPs (192.168...). What is the most ...
0
votes
2answers
1k views

Wrong IP address registering in DNS

I've just taken over a small business network with 2 Windows servers. SRV2 (Server 2008 R2) is primarily a data backup for SRV1 (Server 2003); they're both DNS servers as well. Our primary LAN ...
0
votes
0answers
11 views

PPTPD VPN Can't connect to the internet

I'm running a Ubuntu 16.04 Server on a VMWare ESXI Server with its own public IP, I have setup a pptpd vpn server which works but only with connected devices. I can't connect to the internet with it ...
3
votes
2answers
124 views

802.3ad bonding configuration file on an Ubuntu 16.04 LTS Server

If I use a manual setup on the command line (following the kernel instructions), I can properly setup my network connection: # modprobe bonding mode=4 miimon=100 # ifconfig bond0 up # ip link set ...
2
votes
3answers
1k views

How to speed up Drupal 7 with remote DB (not DNS resolving)

we have Drupal 7 on Ubuntu LTS virtual machine (VMWare) with MySQL 5.1 server on the same physical server, but on a different virtual machine. The Drupal website is currently under development, ...
14
votes
7answers
47k views

How to tell if it's your problem or your ISP's problem

I originally titled this "how to tell if your internet is down or your network is just screwed up" and Jeff's AI said that this questioned would probably be closed. Nevertheless, someone here is ...
-2
votes
0answers
39 views

One Physical Machine hosting Hyper-V Server 2012 R2 and Thin Client connected to VM Server [migrated]

I apologize if there is already answers to this question. I looked for hours but was unable to find a solution through multiple trials and errors of possible solutions online. Configuration ONE ...
1
vote
9answers
29k views

Why would cat6 connectors not work with cat5e patch cable?

I had a naff batch of cat5 connectors (the latching mechanism didn't work) so decided to order in some cat6 connectors in preparation for the inevitable upgrade. My existing reel of for making patch ...
0
votes
0answers
18 views

Subdomain lagging on certain networks [closed]

I am experiencing lags in accessing my learning management system (LMS) on some networks. The LMS is in my company's website subdomain but is hosted on a separate server and the issue appears to be ...
-4
votes
0answers
16 views

Communication between two PCs [closed]

I need to make two PCs communicate using Ethernet connection. I am quite new to the field. I want to know what mechanism would be the best; Client-server, P2P, Uni-cast or multi-cast. Or the later two ...
4
votes
3answers
29k views

Domain connection shows as “unauthenticated”

I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any ...
0
votes
2answers
2k views

Access print server through firewall?

At my workplace, we have two fiber networks setup, one for the business network and the other for process control (industrial manufacturing). On the business network, there is a standard print server ...