Networking

Find External NAT Address using powershell

by on Dec.21, 2021, under Computer Stuff, Networking, Windows Info

Sometimes, you need to know the external NAT address, but you can’t take over the console of the computer.

So, fire up powershell in the background, and run this command:

(Invoke-WebRequest -UseBasicParsing ifconfig.me/ip).Content.Trim()

 

 

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Cannot print to an HP Laserjet 1020 using Terminal Services

by on Jul.22, 2014, under Networking, Windows Info

Terminal Services can only print to your LPT printers (with proper driver installed on the server). In order to print to network printer or USB printer,

1. Install the printer normally (connecting via TCP port or USB port) and make it a shared printer (ie. \\COMPUTERNAME\PRINTER)
2. Install ANOTHER instance of the printer, using the LPT1: (or LPT2:) port
3. Launch an administrative command prompt, and map the LPT port to the shared printer instance:

net use lpt1: \\COMPUTERNAME\PRINTER /persistent:yes

Now, you have an LPT: printer. If you set it as your default printer you can print locally, and Terminal services should now allow you to print from your TS session, as well.

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Setting a PTR record at Comcast

by on Jul.01, 2014, under Networking

To setup a reverse DNS record for a Comcast IP address, please contact the Enterprise Care Center (ECC) at 1-800-741-4141 (option 2, and then option 1).

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Happy Birthday, Internet!

by on Mar.12, 2014, under Amusement, Networking

On this day in 1989, British computer scientist Tim Berners-Lee presented to CERN management a proposal for a “universal linked information system” called Mesh, meant to help staff at the Swiss research center coordinate their work. Today, what we now know as the World Wide Web turns 25. Berners-Lee gave several interviews for the occasion. Looking back on his creation, he told CNet he’s glad the Web has developed as a “non-national” entity but deplores that most people on the Web still stick to their own cultures and their own ways, using the technology to reinforce their biases rather than open their world:

“I’d like it if developers on the Web could tackle the question of how to make Web sites that actually make us more friendly to people we don’t know so well,” he said.

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Public Time Server info

by on Dec.20, 2013, under Computer Stuff, Networking

People are always asking me which time server to use. Here’s the list of time servers hosted by the NIST. You *should* use time.nist.gov, in order to let them round-robin your requests across all of their servers, for load-balancing purposes.

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Review time!! Boolean ANDing

by on Oct.08, 2012, under General Info, Networking

A new, wild Nancy beat her husband hard.
ADDRESS – Get IP address 172.32.45.36 = 10101100.00100000.00101101.00100100
NETMASK – Get subnet mask 255.255.248.0 = 11111111.11111111.11111000.00000000 = /21
WILDCARD – Find wildcard mask/bits = 00000000.00000000.00000111.11111111 = 0.0.7.255 (11 bits)
NETWORK – Drop wildcard mask from IP address = 10101100.00100000.00101000.00000000 = 172.32.40.0
BROADCST – Add wildcard to the IP address = 10101100.00100000.00101111.11111111 = 172.32.47.255
HOSTMIN – Drop the wildcard mask, and add 1 = 10101100.00100000.00101000.00000001 = 172.32.40.1
HOSTMAX – Add the wildcard mask, minus 1 = 10101100.00100000.00101111.11111110 = 172.32.47.254
HOSTS/NET – 2*(WILDCARD_BITS)-2 = 2(11)-2 = 2x2x2x2x2x2x2x2x2x2x2 = 2048-2 = 2046
Find hosts per net using the formula 2 to the power of the bits in the wildcard mask, minus 2.

32-bit IPv4 Network Address
Octet1 Octet2 Octet3 Octet4
128|64|32|16|8|4|2|1.128|64|32|16|8|4|2|1.128|64|32|16|8|4|2|1.128|64|32|16|8|4|2|1
11111111 . 11111111 . 11111000 . 00000000 = 255.255.248.0
10101100 . 00100000 . 00101101 . 00100100 = 172.32.45.36

And I’m sorry, but no. I can’t make it ANY simpler than that. ;)

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DMARC/DKIM is coming. You're all gonna have to learn about encryption.

by on Apr.15, 2012, under Computer Stuff, Linux, Mac OSX, Networking, OpenBSD, Windows Info

HAHAHAHAHAHAHA
Told ya.
Here it comes, check this out. If you work in the technology field, you need to read this:
http://dmarc.org/

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Come to Twin Cities TechPulse!

by on Mar.21, 2012, under Computer Stuff, Networking, Windows Info

Registration just opened for the annual Twin Cities TechPulse event www.tctechpulse.com. Please register as soon as possible as it will fill quickly and there are limited spots available. I know you would enjoy this free event and would come away with some great information. This year if you bring a guest(s) who has never been before, we will give you an extra raffle ticket for each attendee to win one of the great prizes we will be giving away (iPads, Xbox, Laptops, LCD TVs, etc.) Just remember to have them register as a guest of SCC (Brian Hershey).

The event is April 17th in St Paul. It’s an educational event with break-out sessions covering different technology & business subjects along with a great keynote speaker, free breakfast & lunch and over $25,000 in prize giveaways.

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Reset Blackberry BAS admin password

by on Mar.02, 2011, under Networking, Windows Info

Fire up SQL management studio express, and run this query:

DECLARE
@DisplayName VARCHAR(256),
@Authentication VARCHAR(256),
@AuthenticatorTypeId INT,
@AuthenticatorInstanceId INT,
@ExternalAuthenticatorId VARCHAR(255),
@EncryptedPassword VARCHAR(256)

/************************************************************
Start of editing required section
*************************************************************/

SET @DisplayName = ‘System Administrator’ — Display name (Not always used)
SET @Authentication = ‘BAS’ — ‘BAS’ for BAS authentication
SET @EncryptedPassword = ‘7B7ECF0DAF70D040345D8DD92607E274969F4BA5DFDFAEAC5DE775E5340CDF605D5762EC5D326498ADBE72E7434897025A8702D0237046F554DBCA5769B90154:7637B189’ — Encrypted string of password ‘blackberry’

/************************************************************
End of editing required section
*************************************************************/

IF @Authentication LIKE ‘BAS’
BEGIN
SET @AuthenticatorTypeId = 0 — Set to 0 for BAS
SET @AuthenticatorInstanceId = 0 — Set to 0 for BAS
SET @ExternalAuthenticatorId = NULL

IF NOT EXISTS (SELECT * FROM BASUsers WHERE LoginName = ‘admin’)
EXEC SetUpBASorADAuthentication @DisplayName, @AuthenticatorTypeId, @AuthenticatorInstanceId, @ExternalAuthenticatorId, @EncryptedPassword
ELSE
UPDATE BASUsers
SET LoginPassword = @EncryptedPassword
WHERE (LoginName = ‘admin’)

END
GO

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Just installed Virtualbox 4.0 on Ubuntu 10.10

by on Feb.19, 2011, under Linux, Mac OSX, Networking, OpenBSD, Windows Info

Now, with a preview of the running VM!! ;)

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