SG Broadband Community

Email spoofing is on the rise. Country IP Blocks estimates that spoofing may account for more than 80% of all spam and malicious email traffic. Email spoofing is defined as the forgery of an email header so that the message has the appearance of originating from a source other than the actual source ...

Here is a tutorial I wrote about creating a custom security log using PHP. It includes definitions for all the terms, $_SERVER, REMOTE_ADDR, REQUEST_METHOD, PHP_SELF, QUERY_STRING,REQUEST_TIME fopen, fclose, fwrite, etc., an explanation for the function/script and the complete finished code with ...

For those of you learning networking, I've written a tutorial called Identifying the Network and Broadcast Address of a Subnet . In it I provide the basic steps to identify the Network and Broadcast address using an IP/CIDR combination.

Consider it a precursor to learning how to subnet.

I would ...

OSULLY wrote:Tad bit condescending and imo misleading.

OSULLY

It certainly wasn't meant to be condescending. As for being misleading, may I ask you how it is misleading?

I've just completed the programming of a webform that generates random passwords (for those of us concerned about security).

The page offers the following choices:

Number of passwords: 1-99

Password length: 5-64 characters

Password complexity: Several levels of complexity are available ...

I am a professional PHP programmer experiencing brain freeze.

I am looking for a script/algorithm that I can interface with a database to create consolidated/aggregated IP blocks.

Here is the issue:

I own and run Country IP Blocks . This site provides highly accurate network information on nearly ...

I have been monitoring one of the latest injection hack attempts since early July. The attack is pervasive and appears to be powered through one or several of the larger Botnets. The attack, whether successful or not is not hard to miss. It shows up as a rather lengthy piece of hexadecimal code in ...

With the escalating tide of targeted website attacks, server administrators and webmasters would be well advised to examine their logs to predict, prevent and interdict enemy attacks. These attacks can come in a variety of forms, but aside from cross-site javascript attacks, the most prevalent in ...

Have you ever wanted to know where the IP traffic in your logfiles originates? I am developing an IP log submission tool to provide users with the global origins of their traffic. This tool is currently in the beta stage. At the moment it accepts IPv4 data in comma delimited format.

In the beta ...

Joe: What media are you using to connect? Cat5, Cat6, fiber...?

We've just completed round one of the Country IP Blocks web redesign and would love to have some feedback.

In a nutshell, Country IP Blocks is a set of tools for webmasters, network and server administrators or anyone interested in blocking and/or allowing network or website access by specific ...

There is also a tutorial available called: Converting Octets to Binary and Decimal

Country IP Blocks is proud to announce the release of their new IPv4 Octet to binary to decimal calculator . This easy to use IP calculator allows a user to submit an IP address and then view a full visual representation of each Octet, the bit status (on or off) and the corresponding Decimal value ...

The United States has more computers and networks than any other country, but per capita sends out less spam than most.

Among the several networks/servers I manage, the spam volume is highest from Russia, China, Turkey and several other countries. More important than the volume of spam is the ...

I made an outlandish statement more than a year ago. I said Russia is one of the most prolific countries at spewing out spam, malware and other serious threats to the sanity of the internet. SOPHOS has now confirmed what I already knew. SOPHOS, a leading security firm has just published its latest ...

Your type of connection, whether Synchronous or Asynchronous is only one aspect of your download speeds. Bandwidth/trasnfer data can be affected by your OS, NIC, firewall, router, cable/dsl modem, ISP issues, latency issues along the route, load balancing, the volume of traffic on the server you are ...

kugodown2008 wrote:hello ,the website is verygood! I from china!

海,这个网站非常不错,我来自中国

Thank you.

Here's the rest of the article: Proactive Network Security: Blocking Bogons

You can subscribe to my Information Technology Manager RSS Feed here.

And of course, you can get the latest Bogon Network Ranges here.

Network security is a never ending process of staying in touch and in tune with inbound and outbound traffic. Network administrators have their hands so full reacting to the latest security threats they barely have time left over for proactive security. Today I want to discuss one specific proactive ...

Freejoy:

I am not seeing major issues in the traceroute you provided. The route looks fairly clean with the possible exception of some minor slowdown where I would expect some slowdown. Your earlier pings show some slowdown, but based on the location of your pings it is not necessarily unexpected ...

Cooldude911, as an I.T. Manager and Network Manager/admin, I would be more than a little perturbed to discover that some little weasel (generically speaking/nothing personal intended) was attempting to circumvent policies and procedures on any of my networks.

The correct answer to your question is ...

It is possible that you are holding on to a previous DSL settings. Are you doing a release and renew through ipconfig?

There are several issues that could be causing the problems you describe. But, I'll focus on one clue you provided:

...the pings fail to the router when the connection drops...

Assuming you have the exact same problem with both machines, at the same time, and assuming your router does indeed ...

Is this 8 rooms all together have 12 computers...

or 8 rooms...with 12 computers each?

Either way...your setup is fine...a switch per room, each uplinks to a top level switch which also has your servers and router.

Don't worry about "uplink" ports...most switches now are all auto MDI-X....uplink ...

Hi friends,

I would like to know whether 10/100 is compatible with 10/1000.

See we are using switches and routers of 10/100/1000 and firewall in 10/100, whether this will make any difference in my network.

Your question is a bit vague. You will experience an incoming and outgoing slowdown ...

There are some significant differences between switches and hubs. While I grant you most home users could probably get away with using them interchangeably, a larger network would be more restrictive in how, when, where and why switches & hubs would be distributed.

Without going into great detail ...

My LAN operator is using a combined network.. several networks are linked one another.. ips r like 5.0.0.1 to 254 & 5.0.1.1 to 254 and so on . . .
what i need to know is how can i find out how many networks are linked and what are the ips.. i want to scan network on languard but i need ips..
plz ...

There are several different ways of capturing the data related to "the bloke." The data is available in the server and firewall (if you have one) logs. You can also add some ASP or PHP capture scripts to track and log all traffic coming in to vulnerable pages. These scripts can capture the IP ...

What is managing DHCP? Sometimes (not often..but I've run across it a couple of times)...a DHCP servers database becomes corrupted...the server doesn't let go of the leases and flush for updates...so it uses up its pool.

I usually have the DHCP pool....router at .1, managed switches from .2 to .9 ...

The 192.168.0.0/16 is reserved for private networks. A good example of a private network is one, two, three or more home computers connected to DSL or Cable through a cheap router.

While it is remotely possible that someone from outside is attempting to access your internal network on this IP range ...

There is a big difference in network size between 100 & 150 PC's receiving IP addresses from the same scope.

Your post doesn't provide enough details to give you a full response, so here's a couple of questions:

What's the address/netmask or CIDR of your internal network? Are you running ...