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

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IPsec tunnel keep crashing

I have 2 locations. On each location is installed VPN device Cisco RV042. Link between location is optical fiber. ISP is the same. Link speed on location A is symetric 3/3 Mbps, and there is static ...
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2answers
8k views

Why can't I ping my server?

I am logged onto my Windows Server 2003. I am trying to ping another server that is Windows 2008 by using the command promt and putting in the ip address that I had given it. For some reason it seems ...
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1answer
239 views

Pinging an interface of same network on same host not working

I'm setting up a very basic IPS test, and wondering if an interface on a host pings an interface with a different IP address (of same network) on the same host, will it reply? Will it respond to ARP ...
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1answer
271 views

samba not working on one interface

I am going a little crazy trying to get Samba working and would really appreciate some pointers. It's quite possible that I have misconfiged some part of the network configuration too. I am running ...
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1answer
1k views

how to investigate real problem with TX packet drops in linux?

I have my vps on CentOS running some my own software wich uses very fast algorithm of sending specially constructed RAW TCP packets to numerous systems running my software. I have noticed too many ...
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2answers
2k views

Server and network setup for a small private school

I help a local private school with a lot of their tech needs. So far, it's been on the order of repairing/installing office computers and helping manage the office network. But now the administrator ...
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2answers
2k views

Guest VM on XenServer unable to reach network

We have set up a XenServer, and trying to set-up a CentOS 6 guest VM. The installation went fine (using RHEL 6 template), but I'm unable to properly configure the network. The guest VM is able to ...
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2answers
326 views

How is latency / travel time determined when you execute a traceroute?

This is simply a question placed out of curiosity. When you execute a traceroute, and get some time durations back for the latency/travel time, how are those calculated? It would seem more than ...
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2answers
5k views

ssh connection refused only from my mac, my linux box connects without issue

I am having a strange issue. I have an EC2 server (Arch Linux) that I am able to access (via ssh) from my local linux server without issue, however when I try to ssh into my EC2 server from my ...
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1answer
91 views

How to diagnose whether a customer's ISP is throttling access to my website?

We host a website that servers up mostly static files, such as html and flash SWF files. The server is hosted in Auckland, New Zealand. Our customers are mainly secondary/high-schools. In general, ...
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3answers
8k views

Cisco ASA 5505 Config -> Text File

I'm just starting out learning to config Cisco ASA. My office lent me their old ASA 5505 and I plan to do a factory-reset. Before I do that, I'd like to backup the config to a text file on the ...
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1answer
55 views

Network issues in Windows 7

We recently upgraded a dozen of PCs to new hardware and Windows 7 professional (before we had XP), but we are experiencing many newtwork issues, for example SSH sessions (using Putty) stops working ...
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2answers
8k views

How to debug “HTTP request sent, awaiting response”?

I have a Linux server on an ADSL connection, and I just noticed that sometimes I get Connecting to example.com|xxx.xxx.xxx.122|:80... connected. HTTP request sent, awaiting response... when I use ...
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1answer
98 views

Webserver Layout [closed]

I would like some advice about a network layout for a medium company hosting a website/web service. Currently I have the following Layout in place...Network Layout I would like the private area ...
3
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1answer
373 views

Programatically extracting interface configuration from the system?

I would like to produce a list of all the interfaces available on a [Linux] system, and for each interface, produce a list of available IP addresses. I was hoping to do this in a more graceful ...
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5answers
3k views

Can't ping one server of two by name, but can ping both by IP

I have two database servers where I can ping both by IP, but can only ping by name for one. The setup: Server1 - Original Data Server2 - Receives data from Server1 through replication Server1 can ...
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1answer
63 views

Network Change Control & Compliance [closed]

I'm looking for a network change management & compliance audit tool, I know that SolarWinds and tufin are very know. Do you have any experience that you can share regarding these two or other?
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2answers
1k views

Block nmap xmas scan from detecting my server's open port

I have blocked all the basic nmap scans using iptables by making a rule in the INPUT chain that if the no of packet send from a particular ip within 10 seconds exceeds a particular limit then put that ...
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1answer
3k views

Virtual machine with two nics connected to different networks on VmWare ESXi 4.1

I have a virtual machine and the need to add a different network to it. 1st nic is already working on 192.168.1.1 2nd nic should be working on 10.0.0.1 I've added the new nic and connected both to ...
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1answer
2k views

Loaded Vs Unloaded Patch Panels

What is the difference between loaded and unloaded patch panels? Is it simply that loaded patch panels come with endpoint sockets and unloaded patch panels do not?
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1answer
2k views

Disabling IPV6 on Centos6

I want to disable IPV6 in the new Centos6 virtual server I have just setup in Xen. I have already followed the instructions here and then rebooted/restarted networking. Update: followed the below, ...
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1answer
537 views

traffic shaping, prioritizing packets without using a bitrate ceil/max

I've written a script that shapes traffic into 3 pipes. The first pipe needs to be high priority and always be send first. This works perfectly now on 1 condition. I enter a correct ceil/max bitrate. ...
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1answer
1k views

Providing Domain Access to a Non-Domain Computer

I am interested in providing access for remote desktop, printer shares etc for a non domain machine used for development. It is internal to the network and fully secured, the user also has a domain ...
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0answers
754 views

Lots of TIME_WAIT connections with nginx reverse-proxy

I'm using nginx as reverse proxy to redirect some traffic to openfire XMPP server. Here's what I see in netstat: 972 connections to port 80 from outside (includes website and redirected XMPP over ...
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1answer
1k views

Routing squid traffic via same interface over different gateway (= DSL modem)

MI have two interfaces on an ipcop machine, eth1 (public) and eth0 (local LAN). Transparent SQUID is listening and caching on eth0, and all traffic is routed from there across eth1 for public web ...
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1answer
50 views

Can you disable network interfaces from the command line in Windows Server 2003?

Was wondering if it was possible to disable network interfaces from the command line in Windows Server 2003? If so, how? Thanks!
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2answers
63 views

Hack your machine domain lookup capability [closed]

I want to put some entry in some file such as www.google.com 127.0.0.1 So that whenever a linux user types the domain name www.google.com on his browser then the website hosted on the localhost ...
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2answers
8k views

Multiple network interfaces on RH 5.6

I have a Redhat 5.6 server with multiple network interfaces plugged into different network switch ports, mostly each on a different vlan/subnet. How do I know which interface is on which subnet? As ...
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2answers
3k views

Cannot ping linux (RedHat) machine by hostname

For some reason, a linux (RedHat) machine that I have is not ping-able by hostname! It is ping-able by IP address though. I have the same network configurations as another linux (RedHat) machine ...
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1answer
521 views

Using T1 RJ48X extender to extend RJ45 from cable modem. Possible?

In our building, the demarc is on the complete opposite side from the network closet. So, the T1 is extended from the demarc with a CAT5E cable that runs across the building to the network closet and ...
2
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1answer
74 views

Help determining what kind of network equipment I need [closed]

I am trying to figure out what I need in order to complete my networking infrastructure. Here is the scenario I have: I have a computer with a wireless networking adapter in it. My Internet comes ...
3
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1answer
165 views

Massive RST packets being sent

I've been fighting off a weird issue we've been having in our internal network: from time to time, multiple applications that we use simply freeze: SQL Management Studio, Red-Gate's Data Compare, ...
3
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4answers
98 views

Is there a device or piece of software that can act as a transparent Ethernet bridge and limit bandwidth on MAC by MAC basis?

So for example, it will only let a particular MAC address on side A use 100kbps in ether direction.
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1answer
9k views

How to set up routing for RRAS VPN connections

I have a NAT/firewall running DHCP for the LAN configured to forward the VPN ports directly to the Windows 2008R2 server behind the firewall on NIC1. The LAN switch is also connected to the firewall ...
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1answer
109 views

I need some advice to come up with a network plan, or sort of anyway

At my workplace we have been allotted a few IP addresses by the ISP. I think currently one IP is accessible from the outside (by accessible I mean in a browser). Typing this IP into a browser gets you ...
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1answer
626 views

Most secure way of connecting an intranet to an external server

I have an internal server that hosts an asp.net intranet application. I want to keep it completely and utterly secure and private however we need to expose some information through a WCF service to ...
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2answers
272 views

Network Collision Monitoring

I want to monitor my network devices (router, switch) in our network for collisions. Can anyone please suggest any open source web application which can be used for the above purpose?
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2answers
61 views

Filtering Live Messenger traffic by contacts

I am looking for a filtering solution to be able to filter Live Messenger traffic according "with who" they are chatting. We use Messenger for work, but some of collegues gets a lot of "out of work" ...
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1answer
291 views

Allow nmap advanced scans for a normal user

I want to allow a normal user to run NMAP's advanced scans like XMAS, TCP FIN, TCP NULL scans. Can somebody please tell me how to do that ?? Since it uses raw packets so whether setting the setuid bit ...
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1answer
228 views

Detecting TCP/IP connection drop issues in my application

I have a desktop application which talks to a server using TCP/IP. It was working before but now we are running into an issue. The log message on the server shows that the socket is disconnected after ...
3
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2answers
325 views

Routing problems IPv6 client/server where server has both native and tunnelled address

I have been trying to get IPv6 working on my tap OpenVPN network. The server already has IPv6, however it only has a /64 and the biggest range available is a /116 (which breaks autoconf). I am getting ...
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4answers
136 views

Keeping Track of LAN IPs without Access to Router

I'm creating an application that needs to track slave machines on the local network. I came across this post: Set up to resolve local ips However, if the local ip assigned to the various hosts ...
2
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1answer
606 views

1 DHCP server, two scopes, two different VLAN's — A bigger problem than it appears?

So we're running single DHCP servers (at each location, we have 3 locations) that serves up IP addresses to our employees/staff as well as our student body. We have a single DHCP server that connects ...
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1answer
82 views

Setting up internal and external IP [closed]

I am quite new at setting websites up to contain SSL certificates and allow them through a firewall. I am currently at step one and have been told that I need to set up an internal IP address on my ...
0
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1answer
8k views

Terminal Server: how to map network drive for all users?

I'm using Windows Server 2008 as a Terminal Server. How can I map a network drive for all users? Should I use a logon script and net use command? Where should I put it?
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4answers
371 views

Extent LAN over internet

I have the following scenario. A computer is connected to private network. I do NOT have access to modify anything on this private network. I am just supplied with a network cable. The computer ...
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2answers
2k views

Tool to catch http request, modify it and send again

I need a simple tool under Windows which can catch some http request, make it possible to modify request headers (manually) and send it again
3
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2answers
3k views

netstat and ip_conntrack connection count differ by order of magnitude. Why?

in /proc/net/ip_conntrack I have: established 3076 time_wait 4346 total 7468 and in netstat I have: established 1051 time_wait 73 total 1165 Why is that? Where are other connections? How to ...
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1answer
4k views

Why Openvpn use network 0.0.0.0 netmask 128.0.0.0 as default route?

If you use "redirect-gateway def1" option in openvpn config file,the server will add a default gateway on your route table, what i want to konw is Why openvpn did not use network 0.0.0.0 netmask ...
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1answer
232 views

How does tcp keep a connection alive? [closed]

In http ( over tcp) there is a header which called keep "alive" I dont understand how a connection can be open in tcp if all packets come from different source ( router decision - over the internet) ...