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

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Hazards of increasing network size by changing the netmask

We are running a small network with address range 192.168.0.0/24. So we only have 254 IPs available. We want to increase this range slightly, to allow more hosts in the network. So if I change the ...
3
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1answer
2k views

How to install (old) packages for Ubuntu 9.04?

Based on some excellent feedback by Mark here (http://serverfault.com/questions/285598/should-i-clone-a-physical-server-to-create-a-vm-for-a-staging-server), today I was able to use the vmware ...
0
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2answers
164 views

Using IIS 7 for accessing site more easily on network

I have a site hosted in IIS which I am able to access on the local machine using the IP address and port number eg http://114.12.34.23:86/ . What I would like instead is to access this using ...
2
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3answers
39 views

Linking servers to an internet connected computer

Quick networking question. My main dev machine is a notebook and my source control and file server (two computers) are desktops which are not meant to connect to the internet. My Notebook connects ...
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0answers
138 views

Linux FOG Server Memory

I'm a computer tech at my high school, and our technologically-superior head just got fired. He just set up a Linux FOG server before he left, and we have to re-image all the computers in the school ...
12
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2answers
336 views

Need help in finding these cable labels

I was watching a video on Cisco's new data center in Allen Texas and at the 7:15 mark they show some interesting cabel labels - photo attached. Can anyone help identify where I can purchase these ...
0
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1answer
487 views

Domain Cannot be Found in Virtual XP Mode

I setup VirtualXP on a Windows 7 PC, but I cannot join it to our network/domain. Keep getting the error that the Domain Cannot be Found. Any ideas?
0
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2answers
236 views

VLAN as access security through VPN tunnel

I'm not a network wizard, but I know my way around a TCP stack and have employed the help of Wireshark and tcpdump quite a few times. Now my company has been tasked to grant somebody else access to ...
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2answers
893 views

How can I set up a proxy/router, so that some requests go to a slow VPN, and the rest goes to a fast local connection?

I have access to two gateways - one a slow VPN and the other a fast connection which blocks some hostnames (I'm behind the great firewall of china (gfw)). I'd like to set up something (a tunnel / ...
0
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1answer
729 views

Trying to get DNS services running on Windows Server 2008 R2, what am I getting wrong?

Ok, So I am basically trying to get a home server pc up that will provide Domain name services, act as Mail server and web server. I have one static IP, well it's not officially static but hasn't ...
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3answers
3k views

Am I supposed to assign the broadcast IP somewhere?

This is a very basic question from a newbie point of view. I have a dedicated server at Hetzner running Windows 2008 R2. I bought a subnet of IP addresses to use in this server. They provided me a ...
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2answers
783 views

CentOS 5.6 Firewall Script [bad/good practice]

I am currently setting up a new machine with CentOS which is going to host a very large site 1M unique+ per day. Now I know my away around Linux quite a bit, but I have never been the expert when it ...
4
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1answer
132 views

Prevalence of WMI enabled in real Windows Server networks

Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that ...
0
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1answer
469 views

Cisco ASA Port Number Reuse

So our client is using a Cisco ASA and they are having occasional "Page cannot be displayed" errors. We have determined through lots of troubleshooting that our firewall doesn't like the ASA reusing ...
0
votes
1answer
2k views

Virtual IP not getting pinged: wrong settings?

I am working on Linux. I added a route to a virtual IP say: 100.10.10.2 by running the command: route -n add 100.10.10.2 gw 127.0.0.1 It has been redirected to my local loopback. I checked the ...
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1answer
3k views

How can the route between two private IPs go via public IPs?

I'm trying to understand what this output from traceroute means. I changed the IP addresses for privacy but retained the public/private IP range distinction. traceroute.db -e -n 10.1.1.9 traceroute ...
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2answers
670 views

tracert IP address strange behavior

I'm not the network admin, so bear with me please. Is there a way to find out which DNS server is responding to a TRACERT? When we type TRACERT 123.45.67.89 the wrong domain name comes back: ...
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3answers
196 views

Percentage of computers on Internet behind a NAT?

I'm in a process of developing a server application and I would like to know if there are some numbers (or experience from people) on how many computers are behind the NAT on the Internet? Since my ...
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3answers
1k views

iSCSI RAID 1 on two servers, fail scenario

Imagine I have two servers, each server has two disks in RAID 1. Now I merge the two arrays with iSCSI to one RAID 1 disk. Two questions: Can I do the merging of the 4 disks in one go? I can't image ...
0
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1answer
732 views

Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up ...
0
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1answer
694 views

SIOCSIFFLAGS: Resource or Device Busy

Have a Dell PowerEdge 2350 with dual nics built into the motherboard. eth0 works fine. Setting up an IP under eth1 results in the error: "SIOCSIFFLAGS: Resource or Device Busy". I have two ...
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2answers
520 views

Juniper Networks SRX240 as a office router? [closed]

We're a small (7 person) fast growing startup who just got our new office and we're having a 100 Mbps line installed from Cogent. I'm not familiar with Juniper devices, however the equivalent Cisco ...
0
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1answer
43 views

Problem during SSH

I am trying to run ssh command from one machine to another and gets the following error message ssh: connect to host 10.22.254.70 port 22: Connection refused It is able to ping the same machine ...
4
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1answer
119 views

/etc/hosts for single process

Is it possible to set domain names mapping directly for an executable? As if we edit /etc/hosts/ and then run the executable. Example: $ ping google.com PING google.com (74.125.232.48) 56(84) bytes ...
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2answers
175 views

Wireless access point - high performance [closed]

Can anyone recommend a wireless access point solution that will handle 25-50 users streaming video? I am very familiar with consumer grade stuff and don't want to assume anything I can buy at Frys ...
0
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1answer
197 views

tcptraceroute showing paths of greatly varying length

I'm tracing a path to my server using tcptraceroute. The server is showing intermittent network availability. It's as if some packets get through fine, others take a long time and some never get ...
1
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1answer
172 views

TCP stops sending weirdly

In case to find out the cause of TCP retransmits on my Linux (RHEL, kernel 2.6.18) servers connecting to the same switch. I had a client-server pair send "Hello" to each other every 200us and ...
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1answer
199 views

Cloning OS install over network

Looking for solutions which will allow me to clone an operating system to several pc's at once over LAN? It must support multiple operating systems (win. linux, mac). Using boot up media or network ...
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1answer
1k views

Diagnosing the slow performance of my NAS?

I recently built a NAS box on top of ubuntu server. I have an average transfer of about 10mb/sec over gigabit wire to my computer. I was hoping you guys could give recommendations on how to pinpoint ...
3
votes
3answers
407 views

Anti-DDoS Question [duplicate]

Our company´s main owner (telecon group) wants us to deploy anti-DDoS mechanisms, such as Arbor Pravail, which is a great idea. Although... I have a question... If our main ISP Backbone provider have ...
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1answer
97 views

G4 server running slow

I have HP proliant ML 350 servers. We have 8 remote locations where users connect and log on to our server through DYNDNS to access our company ERP's to conduct day to day work. The base of our ...
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votes
1answer
35 views

Assign hardware to different users on windows server 2003

I have this software that has port conflicts on my windows 2003 server. So my solution is to use Virtual network card from http://www.ntkernel.com/w&p.php?id=32 . I have 10 users per server, how ...
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1answer
177 views

Network config / gear question

I have been tasked with setting up a fairly straightforward rack in a data center (we do not even need a whole rack, but this is the smallest allotment available). In a nutshell, 4 to 6 servers need ...
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2answers
287 views

Best server monitoring client with Raid monitoring [closed]

I would like to implement some open source monitoring in my server infrastructure. I want detailed monitoring for both the server and Raid array. The client should notify me if any of the disks fail ...
17
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2answers
907 views

What is the fall off of subsecond throughput on Ethernet Network Interfaces

On a network interface, speeds are given in term of data over time, in particular, they are bits per second. However, in the uber-fast world of computing -- a second is kind of a really long time. So ...
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2answers
304 views

Monitoring instantaneous network throughput at one second intervals?

For a testing setup I have, I need to monitor the throughput through a "router"* at regular intervals of around 5 seconds or less (sub-second intervals would be very nice, but not required). Ideally, ...
5
votes
1answer
1k views

Draytek Vigor 2820 static IP's

I have a Draytek Vigor 2820 router which is connected to our ADSL provider (British Telecom, BT). We currently have one static IP address which is accessible from anywhere outside of our network and ...
3
votes
2answers
2k views

How do I set permissions on network shares to allow SYSTEM account access in server cluster?

I want to share common data within a cluster of servers via network shares. There will be one share folder on each server, which all the other servers can access. The server processes that will be ...
2
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1answer
876 views

Wireshark Display Filtered for Unreplied ICMP Echo Packets

Is there a wireshark display filter that will find ICMP echo requests that didn't have a reply?
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3answers
815 views

Ubuntu server (VM) with two interfaces. Can only pass traffic on one or the other interface at a time

Let me start with a crude network diagram. Internal Layer 3 switch (Multiple VLANS, including 172.16.220.0 network) --> Internal network (172.16.220.0/24) --> eth1(172.16.220.100)-Ubuntu 10.04 ...
0
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1answer
515 views

Desktop machine tries to map network drive with the wrong credentials

I'm on a Windows domain. And I have a user that is trying to access the C$ admin share on one of our servers. He has all the proper permissions, and usually tries to access the share via run ...
5
votes
3answers
8k views

Pick the default network interface

I have a server with 2 interfaces. eth0 is 100 times faster than eth1. Though for some reason, every reboot, the default interface is picked at random. To make things more annoying, they both use the ...
3
votes
5answers
2k views

Basic IP address structure

We currently have a few servers, around 30-40 workstations and 16 phones. Each device has a static IP address. As an example the standard settings for a new workstation is; IP: 192.168.1.XXX ...
0
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1answer
263 views

(windows) reset or change username & password for a login to another computer (samba/linux) on the LAN

When you open up the 'Network' window on windows, and you see computers and or network shares for the workgroup, well, I accidentally input the wrong username / password for the computer it is ...
0
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1answer
281 views

Layer 2 and Layer 3 switch migration

I just started a new gig and am trying to pick up our networking infrastructure as quickly as possible. We have 8 fiber runs located throughout the building in different parts. All the local devices ...
6
votes
2answers
1k views

TCP SYN Flooding Detection Method in the Linux Kernel

When the Linux kernel detects SYN Flooding it logs a message like: possible SYN flooding on port 80. Sending cookies Does anyone know the exact method that the kernel uses to detect this?
2
votes
1answer
258 views

Precise Method of Failure Detection with Intel's Adapter Fault Tolerance NIC Teaming in Windows Server 2008 R2

What are the details of the method(s) that Intel Adapter Fault Tolerance (AFT) uses for the detection of failed links in Windows Server 2008 R2?
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3answers
156 views

Network equipment to provide firewalling, switching, and redundancy

What kind of networking equipment would you recommend for a set of hosted Web servers, given these circumstances: Current Situation There are two web servers in colocation, in a dedicated closet. ...
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3answers
4k views

Can't ping NETBIOS name of Server 2008 R2 domain

I've got some general slight network errors on a network. As part of testing I've discovered that I can't ping the netbios name of the site. Ping mydomain Returns: Ping request could not find host ...
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2answers
55 views

Connecting via url to a server that is on the same network as me

Good day, I'm having problems with the ftp server I've just set up. I've already managed to configure my modem and wireless router to open up port 21 and setup ftp in my server. But It seems that ...