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

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359 views

Does Amazon AWS block multiple connection from the same IP?

I use Amazon AWS, however, I am noticing a problem. I have a machine I host outside of AWS which needs to make multiple connections to a database located within AWS. It needs to make several queries ...
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2answers
177 views

DNS not resolving some websites properly [closed]

From the network in our office, some websites are not getting resolved to their proper IP addresses. I guess it is a problem with our DNS server because, when I changed it to Google's public DNS, I ...
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1answer
194 views

Network communication in 2Hosts [closed]

We have 2 Linux Hosts each has 2 Nic Cards with below IP addresses,ech0 and eth1 are in different network , Host1:eth1 and Host2:eth1 are connected by direct cable, due to some Hardware issue N/W ...
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2answers
796 views

Which UDP ports are required to resolve external hosts?

Today I asked my hoster to block all UDP ports except port 53. Due to daily UDP attacks, this was currently the only option to stop flooding my lines. Now since the block is in place, I cannot wget ...
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4answers
578 views

Transient network dropout for Xen DomU's

We've got a CentOS server running a cluster of virtuals. Occasionally the cluster's internal network drops out for a minute or so ... and then comes back. The problem is somehow related to the ...
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2answers
679 views

KVM Networking changes in RHEL6 vs RHEL5?

In RHEL 6.1, I'm running 3x VMs and 2x virtual switches as per the following simplified description: BRIDGES sw-backend sw-dmz VMs firewall -> eth0: sw-backend and eth1: sw-dmz be-vm -> eth0: ...
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1answer
635 views

How To Block Some UNC Paths for Windows 7 In An AD environment

I look after a network where the servers are Server 2008 [Domain controllers] and the client stations are either Windows 7 Pro SP1 64 Bit or Windows XP Pro SP3 32 Bit. I have configured GPOs to ...
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3answers
4k views

How to optimize Tomcat 6 SSL performance

We're running Tomcat 6 on an Ubuntu 2GB slice on slicehost.com The JSP application fwiw is Open Clinica 3.1 I implemented SSL pretty much by the book as you can see: <Connector port="8443" ...
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3answers
334 views

Blocking VM's network temorarily from host machine in KVM

I am trying to perform few changes to a running VM's MAC address and obtain new IP address. Currently the VMs are connected to the outside network through the host's bridge interface. I would like to ...
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1answer
60 views

Network strange problem [closed]

I have a CPanel server with 5 IPs and a few domains. During night, access to main domain through HTTP return 324 no response many times. After several refresh it comes but many assets won't load and ...
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8answers
2k views

If I send data to my computer using its public hostname, does it actually go over the internet?

To clarify: I'm using my public hostname to connect to a MySQL database. The hostname resolves to my server's external IP (e.g. 1.2.3.4). Is the data I'm sending/receiving via the MySQL connection ...
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2answers
47 views

combined connection for 3 non-stable channels

I have 3 non-stable connections between 2 my Linux servers located in different countries. These 3 connections have different routes. From time to time one or two connections have packet loss problem ...
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4answers
1k views

Basic traceroute question - good traceroute, but connection times out?

Basic question: if I get a decent ping between hops in a traceroute reading, BUT I'm unable to connect to the host via FTP, what does that imply? By connecting via FTP, I simply mean using FileZilla ...
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1answer
8k views

How do I fix “No Internet Access” message in Network And Sharing Center on Windows 7 when connected through corporate proxy?

The question pretty much says it all. I see all of our Windows 7 machines have a little exclamation point saying "No Internet Access", when they do indeed have access. Our proxy is Bluecoat if that ...
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2answers
2k views

SciLinux6 (RHEL6) how to specify network setup and routing the redhat way?

I've got a SciLinux 6 box with 5 nic's in it. I'm not getting the network configuration I want (particularly the routing). While I can certain put a bunch of route statements at the end of rc.local, ...
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1answer
410 views

New ethernet dual card hangs the server when doing ifconfig eth2 down

What I'm going to explain is happening on two different servers with same OS, same hardware and same hardware upgrade. IMHO I think may be a driver error is going on, but don't know how to figure it ...
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1answer
307 views

Question about Cisco WIC-2T

I am using some (what I thought was) wic-2t cards in 1721s that I ordered from Ebay. I was trying to set the clock rate on one of the interfaces and received an error. The card in slot0 works fine, ...
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1answer
353 views

Is there a way to bridge two outgoing TCP connections in order to bypass firewalls and NAT?

We're all familiar with the problem of port-forwarding and NAT: if you want to expose something to accepting an incoming connection, you need to configure port-forwarding on the router or conjure up ...
3
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2answers
17k views

RHEL6 “/etc/sysconfig/networking” is missing, can't configure any devices through system-config-network

I'm having an issue configuring networking for my RHEL6 box. Whenever I run "system-config-network" -> "Device configuration" I get nothing there, like I dont have any ethernet devices, when I look ...
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3answers
479 views

Looking for this special RJ45 modular connector so I can terminate my own cables

We're doing a rewiring project at my work (server room is a mess of cables) and we've decided to go the route of cutting each cable to length and terminating them ourselves. In the past, I've used ...
0
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1answer
128 views

Giving IP to the bridge not to the Ethernet interface

Further to this question, what is the philosophy behind adding an IP to the bridge device br0 and not to eth0 that is a part of the bridge. None of the answers to that question satisfied me.
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2answers
279 views

Network monitoring system capable of link functionality (like OpenNMS linkd)

The OpenNMS monitoring system has the ability to automatically discover and display links between nodes and networking equipment. The module is called linkd and is a very handy way of visualizing ...
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1answer
710 views

OpenVPN routing for OpenVZ containers

I am trying to make OpenVPN tunnel accessible for all OVZ CT's running on the host. I have initialized the tunnel devise on the host server to remote VPN server. Although I have PING response from the ...
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2answers
474 views

Apache Delay in Requesting Web Pages During High Traffic

I have a server running CentOS 5, MySQL 5.1, and PHP 5.2. I have a problem that I'm not sure where to start in troubleshooting. It seems that during periods of high traffic, Apache will occasionally ...
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1answer
1k views

Setting up PXE boot server for Ubuntu 11.04

I want to setup a pxe boot server for installing linux 11.04 amd64 server edition on some blade servers. I had installed 10.04 last year and it worked nicely. I am following same procedure for 11.04 ...
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1answer
1k views

How to Route Internal Traffic on a 2nd NIC without a Default Gateway

The actual deployment of this will happen with a larger number of servers, but for purposes of simplicity, let's assume the following is my future setup (I need +4 reputation to embed images, so ...
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1answer
105 views

Not sure how to handle routing with 2 NICs on 2 different subnets

We currently have 11 Dell PowerEdge servers running CentOS 5.6 in a cabinet at a colo facility. Our colo provider recently informed us that they want to move us to a new VLAN, and give us all new IPs ...
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1answer
109 views

Problem regarding sub-netting and sub-net mask [duplicate]

Possible Duplicate: How does Subnetting Work? An organization is allocated the IP block of 172.16.0.0/16. It has a head office and three branches each of which can have 500 to 4000 hosts. ...
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2answers
2k views

Dropped network connections to hyper-v server and guests on local network

I have recently installed at home a new Windows Server 2008 R2 SP1 to be used primarily as a hyper-v host for several home servers. I'm having some interesting networking issues that I suspect are ...
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2answers
287 views

MySQL fails once per day. How to change “localhost” to 127.0.0.1

I get a can't connect through this socket once per day. Is this datadir correct?: [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock Aborted connection 1270592 to db: 'leechprotect' ...
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3answers
665 views

Add frame window to all websites for users on network

I'm working for a small ISP and I'm trying to figure out how I can add a frame window to all websites that all users on our network see, so that we can promote faster speeds / notify users of ...
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1answer
155 views

Is it normal to have a private range IP in a traceroute?

When I traceroute any website the first IP after the ISP gateway is a private range one (10.1.74.xx). Is it normal? Can it cause any problems (problems for Postfix delivering messages for example)?
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2answers
200 views

how to implement elastic ip like architecture in private server farm

what are the ways by which I can implement elastic ip like architecture in my private server farm? There is only one global ip available but I should be able to ssh any server from external network by ...
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2answers
290 views

What is a good solution to manage a lot of computers over the internet? [closed]

Here is the situation. Our company has just over 300 computers in 90 offices spread across 4 different states. The computers are old and runnings Windows XP. I am looking for a good cheap way to ...
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2answers
514 views

URL rewriting for WordPress Network (Multisite) subsite

We have an install of WordPress Network (Multisite) that has multiple blogs running under the url blogs.exampleurl.com where each subsite is blogs.exampleurl.com/site1 /site2 etc... We have a user ...
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1answer
366 views

Racktables and DHCP

For those of you out there using Racktables, how do you handle DHCP scopes? I haven't been able to find a way to show the IP addresses as allocated.
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3answers
447 views

how to prevent Packet loss due to high delay?

I am using netem (TC module) for introducing the delay. My requirment is like this that i want to introduce 5second delay. I am running command : tc qdisc add dev eth0 root netem delay 5s Now i am ...
2
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1answer
2k views

IP address conflict with MAC address 00:00:00:00:00:00

One of our Windows 2003 R2 ISA firewall servers recently had a 1-hour spell of intermittent connectivity to our Internet WAN connection, which was fixed after disabling then re-enabling the network ...
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2answers
280 views

(Simple) UDP Protocol - Networking

I know that UDP is an unreliable protocol where things can arrive out of order, fail to arrive completely, etc. I'm also aware that when using UDP for something like traceroute, packets that arrive ...
11
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4answers
1k views

Industry Standards for Network Infrastructure Labeling

Are there any current industry standards IEEE, ISO, ANSI.... available that state how a buildings physical infrastructure should be labeled at the rack and jack and how the documentation should be ...
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5answers
136 views

Can no longer connect to SQL Server 2008 from another machine

Excuse me if this is too open-ended but, I have a Windows Server 2008 R2 Standard. It's running a SQL Server 2008 database server. (all 64bit if that matters). Earlier today they had a power outage. ...
2
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2answers
95 views

QoS switch messing with local http traffic?

WE just moved our rack to a datacenter in the building. In our rack is a blade running centos and apache for intranet stuff. When we moved to the DC, we essentially extended our LAN there via adding a ...
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2answers
85 views

Have VM using bridged networking, but on host machine without network

I'm configuring a LAMP development environment inside a VM and I'm no Linux/networking champ but I'm trying. I've installed Centos (5.6) in a VM (VirtualBox) on my local machine. I've set networking ...
2
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1answer
233 views

Hyper-V Test DC: access via RDP from production domain

i got a little trouble with a test setup i want to do using Hyper-V. Its supposed to be running within an active domain network. I want to setup a DC and other Servers - so normaly i would choose a ...
3
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2answers
3k views

Switch Floods Packets that should be Unicast

I work as a Network Admin in a big company. Lately we noticed an issue with our network infrastructure. Basically our network backend lies on a Catalyst as main L3 backend switch, and few Cisco Nexus ...
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1answer
2k views

sysctl setting for maximum connections from ip address

Is there any settings in sysctl that controls the maximum number of connections that are allowed from any one ip address? I'm having connection issues a redis server and a rabbitmq instance and I'd ...
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3answers
994 views

possibility of overlapping networks

I have a question. I came across the following situation in a windows server ... 192.168.0.0 mask 255.255.0.0 GTW x . . . 192.168.3.0 mask 255.255.255.0 GTW y By chance in this scenario there is ...
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1answer
902 views

Outbound SFTP forward proxy

I have two web servers each with a public IP that make outbound SFTP connections to various SFTP servers to update content. I would like to setup a Forward proxy for SFTP outbound connections. Does ...
5
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1answer
2k views

Determining at what time a currently open TCP connection was created?

How can I find out at what time a currently open TCP connection was established on Linux?
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2answers
7k views

Why is Windows 7 booting up with Mapped drives showing as disconnected?

We've got numerous Windows 7 machines that will show a mapped network drive as disconnected on boot up. Seems to be all versions of Windows 7 as well. In the "My Computer" windows the mapped drive is ...