26 Thursday Apr 2018
Posted in Cisco, Networking, Shell Scripting, TCL, Uncategorized
So I have had need to quickly build a provisioning server for a lab to auto provision devices as they come online. This is the basic steps to accommodate this. Note there are far more complex and secure methods to utilizing something similar in production. Feel free to use this as a learning tool, but understand in a production environment, this is not recommended as critical pieces of information would be sent in clear text.
18 Tuesday Jul 2017
Posted in CodeProject, Development, Uncategorized
I’m an elitist in the worst way sometimes, so this is probably the pot calling the kettle black. But I simply want to pose a question, that no doubt will spark great debate among a very divided culture:
Why does the coding style we use to imply organization of the characters in the document representing code need to be so explicitly tied to the keywords, syntax, semantics, operators, closure, and the most important part… the resulting libraries that make up the development environment we seek to develop within?
It’s always the same argument Braces and Semi’s versus Linguistic command flow.
27 Monday Mar 2017
Posted in Application, Bug / Known Problem, CodeProject, Development, RootAdmin, TCP/IP
A problem currently exists within Solarwinds where 4-byte (32-bit) ASNs overflow into a negative number when utilizing a portion of the private scoped ASN space specifically, the ranges 2,147,483,648 (32768.0) through 4,294,967,296 (65535.65535) overflow into -2,147,483,648 through -1 respectively.
To show the correct data, we created a custom table utilizing the following WSQL to generate the correct information. See past the snippet for an explanation as to how and why this works.
28 Thursday Jan 2016
Tags
We are currently working on a project to implement DMVPN (IWAN) over BGAN. This is the process I went through to discover how to send AT commands from our Cisco IOS Router to the BGAN unit.
29 Wednesday Jul 2015
Posted in Cisco, CodeProject, Networking, TCL
This exceptional bit of code provided by Jónatan Þór Jónasson is a masterpiece. It provides the ability to send Wake On Lan commands out the local interfaces of a router to WakeUp a device. You will need a device that supports UDP Sockets, so you have to be running 15.0+ firmware.
Found this at ipSpace by Ivan Pepelnjak
ROUTER# tclsh
ROUTER(tclsh)#
proc WakeOnLan {broadcastAddr macAddr} {
set net [binary format H* [join [split $macAddr -:] ""]]
set pkt [binary format c* {0xff 0xff 0xff 0xff 0xff 0xff}]
for {set i 0} {$i < 16} {incr i} {
append pkt $net
}
# Open UDP and Send the Magic Paket.
set udpSock [udp_open]
fconfigure $udpSock -translation binary \
-remote [list $broadcastAddr 4580] \
-broadcast 1
puts $udpSock $pkt
flush $udpSock;
close $udpSock
}
ROUTER(tclsh)# WakeOnLan 255.255.255.255 000f13cd80a1
31 Tuesday Mar 2015
Posted in CodeProject, Security, Shell Scripting
So I get extremely frustrated having to change my password every 60 days because the security department has this belief that somehow that is going to prevent the nightmare at Sony from coming down upon our company. Without getting too deep into the politics around security I am a firm believer that it is far better for people to have a password that is highly complex and never changes or better yet high entropy and very simple to remember as opposed to forced rotations of passwords. My reasoning is simple. If I were a hacker and I got your password, I wouldn’t wait 60 days to use it. I would own you in the immediate… as in right now. Continue reading
17 Friday Jan 2014
Posted in CodeProject, RootAdmin, VB
Steve asked on my previous posting in regards to DNS Lookup in Excel if forward lookup could be done. (Find the IP Address from the Hostname). Believe it or not I one up your request. How about DNS Forward and Reverse lookup as well as Ping!
GetHostname("4.2.2.1") in any Excel cell.
or
Use: GetIpAddress("www.google.com") in any Excel cell.
orPing("4.2.2.1") in any Excel cell.
27 Friday Apr 2012
Posted in CodeProject, Development, RootAdmin, Web, World Wide Web
Tags
business, Domain Name, google, internet, keywords, marketing, meta, nofollow, realist approach, Search Engine Optimization, Seeding, SEO, shadow site, short url, technology, TinyUrl, Web
I was reading through some articles on my father in law’s company blog /ebscospring/ in relation to ISO certifications. I started to leave a comment that eventually turned into an article, in reference to a post requested at the behest of the individual managing SEO for them. Even though SEO is not necissarily relevant to networking, it has come up quite a bit lately. Hopefully, my experience can provide some light in a rather conveluded maze of tactic.
SEO is a tough game. Most people get wind of the concepts and they build the following punch list in their heads:
Step 1. Build a website.
Step 2. ?
Step 3. $$$
Most people even realize you need people to look at it, and you need Top Search Order to make it easily accessible to your perspective audience. About this point is where we make big mistakes or just waste our own time.
Continue reading
26 Thursday Apr 2012
Posted in Application, Development, Networking, TCP/IP, Transport Control Protocol (TCP)
Tags
This is in reference to the following article:
http://www.codeproject.com/Articles/85602/PortQry-Implementation-using-TcpClient-Socket-and
It’s been a few years since I’ve looked at this and recently I had received a notification that someone had posted a response. First I would like to agree with emilio_grv’s response in that Application Programmers should be very careful about handling timeouts within the application. As with any application development, make sure you cleanup any non-used resources as soon as possible, especially with sockets, as you’ll extinguish the available source ports that can be used. In windows environments, the default is 3977.
As a connection timeout is not a parameter available within the TcpClient.BeginConnect() or TcpClient.Connect() functions, an issue arises for those who have large scale processes that must be accomplished in a timely fashion.
With the use of firewalls in the network we make a compromise, trading network visibility for security. We often no longer get a response from the TCP stack at the far end or sometimes even the ICMP message back when a packet passes a firewall whether there is a problem or not. Even more frustrating, we may have no choice in the matter, as another group or organization could be managing the firewalls, and so policy change can be difficult if not impossible altogether. Continue reading
