The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all protocols use TCP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, ...

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317 views

Where do local ISPs' core networks connect to? [closed]

Where do local ISPs' core networks connect to? Do they connect to the Internet Backbone owned by AT&T and Sprint (among others) or do they connect to an IXP (Internet eXchange Point)?
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1answer
95 views

How did we manage to block connections to our VPS?

For the last week we've been struggling to get connected from inside our network to a VPS where we host some files for users of our product. It's up for everyone else, down for us and not blocked by ...
2
votes
1answer
859 views

Networking ARP table in windows cmd

I am reading the book practical packet analysis and I have just learned the fundamentals of the ARP protocol. They also added something about the arp -a cmd command. I'm curious about some of the ...
3
votes
3answers
625 views

Network Latency and Timing as shown by Chrome

I'm trying to understand why a static image being served by IIS is taking ~ 182 ms to load. Using chrome I captured the following timing information. When I request the same image by opening ...
1
vote
1answer
79 views

Microwave Link Latency

An internet provider installed us a microwave link: The issue is that: The ping from our side to the gateway is about 1-2 ms, which is great, but it remains like this for only 12 hours, then it ...
1
vote
1answer
784 views

PPTP VPN - No internet access though the VPN

I am very new to the world of windows server I'm renting a VM in the USA for my web hosting(DC, DNS and Web host role) and I decided that I would install a VPN on it so I could re-route me ...
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votes
2answers
269 views

client's not receveing internet with dhcp. does if i use static

i reloaded my ad, dhcp, dns server 3 day's ago. server 2008 enterprise. and we are having a problem. only the server issue's the ip. all files share's, ad, etc works. can ping and remote desktop ...
0
votes
1answer
44 views

What are the recommended internet security measures to take? [closed]

I have built a speical-purpose server, the only purpose of this server is to download some data from a remote(internet) data feeder and do some data processing in the server as well. The only ...
3
votes
2answers
157 views

New IP addressing from ISP

We just got a new Internet fiber service. Our ISP gave us a /30 for WAN and /29 for LAN? I have never seen this when setting up a new ISP service. I was always given a block of ip addresses (if ...
3
votes
1answer
808 views

“Automatically Detect Setting” vs “Use Automatic Config Script”

I would like to know, in Internet Explorer, the difference between "Automatically Detect Setting" and "Use Automatic Config Script". I think I know that "Automatically Detect Setting" makes the ...
2
votes
1answer
106 views

Protect a public-facing PostgreSQL server against abuse

I have a Postgres database containing public information that I'd like to expose to the internet, for anyone to use. What steps can I take to prevent: Excessively expensive queries that could hog ...
-5
votes
1answer
289 views

Solution for Proxy tools like Hotspotshield etc [closed]

My state has a strict policy about porn. We blocked thousands of IPs (of Porn Sites) so that from within the state they can not be accessed. Which was working fine for like less than a month and then ...
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votes
0answers
473 views

CentOS - Increasing Users Download & Upload Speeds

I have has some clients report that their download speed from my web and ftp servers max out at 4.5Mbps for them, to me thats awesome, but now i am wondering why it stop at 4.5. The services are ...
0
votes
1answer
337 views

HP MSR 30-10a Router - Route Traffic over Default Route

We have a brand new HP MSR 30-10a Router. We have a fairly simple routing situation - we have two IP blocks, one which has a route out. We need things on the first block to go through the router, and ...
0
votes
1answer
474 views

Unable to access my website even after flushing DNS

I am having weird issues with my website, everyone except me is able to reach my website but whenever I try to login to my website I am getting a Server Not Found issue. The website has never had this ...
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votes
2answers
115 views

Collecting Web traffic and monitoring reports [closed]

My company is a med home health company and I have been tasked with seeing what people are doing on the internet. There's been a lot of people complaining of people shopping, surfing internet, etc on ...
5
votes
1answer
570 views

Designing segmented LAN with fairly shared hi-speed internet access on a tight budget

With another member of the owners' association, I've been tasked with designing and setting up shared, hi-speed, internet access, for our apartment building. We have very little budget and hope to be ...
2
votes
1answer
747 views

Sharing an internet connection from a virtual Windows 2012 AD Server

I have a virtual HyperV network used by a number of virtual development and testing servers and an all-in-one Domain, DNS, DHCP server; I want to keep the many virtual servers separated from our main ...
0
votes
2answers
159 views

IP Routing with 2 Subnets

We currently have a Cisco ASA on a range with only two usable IP addresses. The Cisco has 217.67.255.31 and the BT NTE box (for the leased line) has 217.67.255.32. (on /32) Now we want to split this ...
2
votes
1answer
3k views

DNS Issue Windows Server 2012

Background: I have a windows server 2012 install with AD, DNS and DHCP. I also have a netopia router/modem providing my WAN access. My router/modem is configured with DHCP off and connected to a 24 ...
-1
votes
1answer
74 views

How do routers manage multiple data streams? [closed]

Routers manage data connections between the internet and computers or connections between computers on a LAN. It makes sense that when, for example, a computer requests music from Pandora, that ...
0
votes
3answers
191 views

CentOS Network Interface Priorization

I have a CentOS server with 2 network interfaces with configurations: eth0: DEVICE=eth0 BOOTPROTO=none BROADCAST=10.0.0.255 HWADDR=xx: IPADDR=10.0.0.2 NETMASK=255.255.255.0 NETWORK=10.0.0.0 ...
5
votes
0answers
319 views

Freebsd change default Internet channel route

I have two Internet channel and Gateway on freebsd. When I switch channel with the command route change default chan2, the command netstat -nr shows changed default route. But traceroute shows that ...
0
votes
1answer
95 views

Internet usage on my network

I need internet usage of computers on my network. Can ISP provide me with a detailed internet usage of individual computers in my network?
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votes
2answers
190 views

Understanding traceroute-result / the connections between ISP-networks

I was playing with traceroute and discovered that I have a gap in my knowledge on how the Internet works. So, in order to get a better feeling for what happens when I connect to a host, I think I ...
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votes
2answers
101 views

How does a private intra network connect to the internet? [closed]

Yesterday I visited the offices of RailTel - a public company in India that provides communication backbone to the Indian Railways, they had a very sophisticated setup of Optical Fiber cables for data ...
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votes
1answer
95 views

Unusal internet traffic drop off [closed]

I'm after advice on how to approach a problem I'm having on my e-commerce site. Occasionally, the site suffers a levelling off of users on the website, compared to our historic traffic this is ...
0
votes
1answer
50 views

Site-To-Site VPN Failover

Conceptually, how does this work/ would be configured in a Cisco environment, I realise this is quite an open question so please let me narrow it down. Let's say we have two sites: SiteA and SiteB, ...
0
votes
2answers
68 views

Controlling Internet Access

I have just setup a network running on windows server 2008 R2. the server serves as DC with AD services, DNS, DHCP roles installed. MY issue is this, due to the limited bandwidth size, we decided to ...
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votes
1answer
435 views

RDP connection works but actual internet browsing not [closed]

basically I got Windows 7 dedicated server and Remote Desktop Connection to it works, while actually browsing internet doesn't (pinging, internet explorer). The details I've been given from host ...
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votes
1answer
161 views

DNS Error server 2012 domain

We have a server running 2012 essentials as Domain controller and DNS and a few other bits. But over the last few days suddenly all the client computers on the network have lost Internet connection. ...
0
votes
1answer
127 views

Best practices on lowering latency between two endpoints [duplicate]

I would like to know what tools or what kind of calculation should be made in order to find the lower latency possible between two points physically distant. For example: Ping time from Europe to ...
0
votes
3answers
135 views

Using Network Interface With Multiple IP Addresses

If I have a network interface with multiple IP addresses bound to it can I set which IP address on the interface my server uses? It sees to be set to use the first IP address I added to it. Info: ...
0
votes
2answers
89 views

is it possible to findout who creates a hotspot in a LAN?

In my LAN there are some Mac users who share their LAN connection by creating a hotspot via their Airport. I can see the newly created WiFi networks on any WiFi capable device. How can I find out who ...
1
vote
3answers
221 views

Using a GNU/Linux VM through SSH on the internet, is it safe? [closed]

Is it safe using SSH to connect to a Linux VM? (Hosted by http://linuxzoo.net/) By using PuTTY to SSH in, am I exposing my machine to the internet/host by doing this? What security concerns should I ...
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votes
1answer
86 views

windows server 2008 cannot connect to internet [closed]

I am working in project to create local area network for school I created domain school.com and connected the clients with it and assign IP the problem is windows server 2008 cannot connect to ...
9
votes
3answers
526 views

Irregular internet disruption: certain images and JS not loading

first time on ServerFault, and I've got a nice little conundrum. Since a few months now, we've been having issues with our internet connectivity. Environment: Servers: 2 Terminal Servers as an ...
0
votes
2answers
13k views

Can't ping or reach external IP or domain on CentOS 6.3?

I have installed fresh CentOS 6.3 on my machine. Internet is not working at all. How ever I can ping my router and other computers connected on LAN. I've googled and searched various forums but all in ...
2
votes
3answers
166 views

Gigabit switches

We currently in our office have a 20 Mbps fiber optic internet connection with Time Warner. We decided to upgrade our connection to 100Mbps. When the technicians came out, they upgraded the circuit ...
1
vote
5answers
1k views

Microwave Internet vs optical fiber [closed]

Our ISP if offering us Internet via a direct optical Fiber link or a licensed frequency microwave link. assuming there is not obstacle and same distance, which link is more reliable (up-time %) and ...
0
votes
1answer
664 views

MikroTik RouterOS 5.18 Does not connect to internet after restart

I am setting up a RouterOS on an x86 machine. The router is configure and is connected to internet via PPPoE internet connection. I am distributing it to 5 PCs and a Router via RouterOS PC. The setup ...
0
votes
1answer
469 views

Cisco Router ( 2611XM ) and ISP Internet connection

I recently acquired a Cisco 2611XM that looks like this: Now the one I have has only 1 FastEthernet port (Was expecting 2) but I was wondering I purchase a WIC1T - CSU/DSU module for it could I ...
0
votes
3answers
1k views

Creating my own dial-up internet service

Our company has invested immensely on "machine-to-machine" modems, equipped in embedded machinery over the last decade. These work with old-school internet dial-up service. These machines need to ...
5
votes
2answers
213 views

Modelling University student Internet usage

I am working on a project for a university housing client where I need to model the usage patterns of students living on campus. There are obviously many variables at play here, I am keen to ...
0
votes
1answer
64 views

Multiple broadband providers for internal web servers

Maybe I am using the wrong search terms, but I am having problems finding the answer to my question. We have internal servers hosting our web site. We would like to bring in an alternate provider so ...
-1
votes
1answer
1k views

How to distribute the leased-line internet connection between 15 systems? [closed]

We have a 2 MBPS dedicated leased line with 8 static Ip's, and we want to use it on 15 systems with one server. Service Provider offered the 1:1 Speed with 98.5% uptime. I would like to know the ...
-1
votes
2answers
151 views

What happens when an unexpected packet arrives at a computer? [closed]

I have been wondering this for a few days. I basically understand how networks and packets work. But what happens when an unexpected packet arrives? Like, when I didn't send a request for a website's ...
0
votes
1answer
4k views

Clients connected to Cisco router can't access to internet

I'm currently undergoing CCNa academy so I got a "job" from my boss to configure Cisco 871 router. Unfortunately we just finished first semester at academy so there are some things that I'm still ...
0
votes
1answer
54 views

External Client should use our proxy to get filtered by our firewall

I would like an external client (4.3.2.1) to use our proxy (9.9.9.9) which forwards traffic to our firewall (8.8.8.8) which then forwards the traffic back to our client (4.3.2.1). So I'm curious if: ...
1
vote
2answers
505 views

Node.js WebServer on Ubuntu 12.04 not visible externally from the Internet (external IP)

Router: IP: 192.168.1.1 Host OS: Windows 7(64 bit) - IP: 192.168.1.2 Guest OS(VMware): Ubuntu 12.04 LTS(64 bit) - IP: 192.168.1.10 Guest OS has a NAT and a bridged connection via VMWare. I'm running ...