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Latency effects everything we do …… no wait!
I’ve run into latency issues over the last 20 years, and in short, they’ve been X-Modem IBM SNA Citrix Windows Vista X-modem … was created in August 1977 to allow file transfers between Bulletin Board...
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We also know there are known unknowns – Network troubleshooting
Such as WAN link utilisation. Users were complaining that network performance was slow across the 80M WAN link. How did they know? Citrix users mostly … So I ask our telecommunications provider, “is...
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nPing – Diagnosing Lotus Notes network problems
Lotus Notes client didn’t work at the Frensham Pond Hotel, when I stayed there. Long story short Ports 80/443 worked, so I was able to “surf” the web. Port 1352 blocked How did I know? I used...
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New ADSL Router +802.11abg +VOIP
Some things I learnt include: SIP 1st level helpdesk folk will avoid your call if the device is not sold by them Whirlpool has an awful lot of crap, but the back-channel chat can be invaluable. You...
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If you don’t have control of your network – Wireless Security
… then it’s unmanaged and open to exploit. As happened with a customer in mid-2004. The “batphone” rings and it’s one of our desktop support guys. “We’re detected a wireless router plugged into the...
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Learning from implementing a change.
I, of course, researched everything beforehand and had it all planned out so that the implementation of the new policy went without incident. Well, maybe there was a little trial and error. Now that I...
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They don’t make networks hubs anymore
IF you wanted to analyse some network traffic, to see where things were going wrong, you would use a network hub. A network hub is one of the devices you can use to listen to network traffic, as it’s...
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$20,000 because the user was too dumb
A senior project manager reminded me of the power of Freedom of Information requests to stop things. Yes, we can do that for the Minister, but the Minister should be aware that his request will be FOI...
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Non Routable IP addresses
Non routable IP addresses are IP addresses which are not usable on the internet, but can be used on your home/corporate network. 10.0.0.0 – 10.255.255.255 172.16.0.0 – 172.31.255.255 192.168.0.0 –...
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SSL errors, and how to diagnose them.
Frankly, I don’t know, but here’s what I learnt. It started with a customer reporting a problem When we press the publish button on the website, we get a 403 error. A co-worker of mine picked up the...
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The Microsoft Loopback Adapter, NT4 & Windows 7.
Reading a Microsoft blog post recently, I was reminded of a customer request from late 2002. The emailed request was something like this: Had to use the generic Win NT4 install on a Toshiba laptop...
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Determining your MTU, and why you should care.
When we talk about networking, sometimes we’ll talk about Maximum Transmission Unit (MTU) packet sizing. I briefly referred to MTUs in the SSL errors, and how to diagnose them post. Why should you...
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“We don’t do that here.”
It’s amazing how some companies manage to function, or even survive. I worked with a company who operated a large IBM Mainframe network. Now back in the day (late 1980’s), essentially there were two...
View ArticleOur DNS server lies to me again!
By accident, I found out that my DNS server was lying to me again. Last time I caught it out was when it was serving up the wrong IP addresses to me (see this post for details). The problem occurs...
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Some of the nPing functionally is built into the Notes Client, but not much.
In February 2008, I wrote all about a Lotus Notes diagnostics utility called nPing. It’s no more. Go to the web link I provided then and you’ll see this message: Thanks for almost nothing IBM. You...
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The Case of the Windows FTP.EXE not working from the corporate network.
The heading alone should tell you the answer, particularly if I add ACTIVE FTP to it. You see, most Corporate IT people consider ACTIVE FTP a bad thing, and block it at the internet gateway. Sure FTP...
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How to tell a PC’s network link speed remotely
By using PowerShell like this: Get-WmiObject -class Win32_PerfRawData_Tcpip_NetworkInterface -ComputerName Localhost | Format-Table Name,@{label="LinkSpeed(MB)";Expression={$_.CurrentBandwidth/1000000...
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