mrkeck Sharing the Love

26Jun/120

No ads using dns

http://winhelp2002.mvps.org/hosts.htm

8Jun/110

Brother HL-2240

Solution:  Use the gdi drivers

Backstory:

Error trying to connect to Brother HL-2240 over the network.  It is on a local computer plugged in USB.  It is shared.  I found it on the network but it said it couldn't give me the drivers.  So I used the disc and tried the generic 64bit one.  It failed.  Turns out it works if you use the gdi drivers instead.

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6Jun/110

Public DNS

Google released public DNS addresses that every one can use.

8.8.8.8 and 8.8.4.4

I plan on using them instead of my ISP's and that way I can easily remember them no matter which ISP I am on.

http://code.google.com/speed/public-dns/

30Apr/110

IPv4 CIDR Shortcut Formulas

Hosts: 2^(32-CIDR)

IPv4 CIDR to Mask:
IPv4 CIDR (24-32): 255.255.255.256-2^(32-CIDR)
IPv4 CIDR (16-23): 255.255.256-2^(24-CIDR).0
IPv4 CIDR (08-15): 255.256-2^(16-CIDR).0.0
IPv4 CIDR (00-07): 256-2^(8-CIDR).0.0.0

Ex1:
a.b.c.d/24=255.255.255.(256-2(32-CIDR))
256-2^(32-24)=256-2^(8)=256-256=0
Thus, the mask is 255.255.255.0

Ex2:
a.b.c.0/18=255.255.(256-2^(24-CIDR)).0
256-2^(24-18)=256-2^(6)=256-64=192
Thus, the mask is 255.255.192.0

Ex3:
a.b.0.0/12=255.(256-2(16-CIDR)).0.0
256-2^(16-12)=256-2^(4)=256-16=240
Thus, the mask is 255.240.0.0

Ex4:
a.0.0.0/2=(256-2^(8-CIDR)).0.0.0
256-2^(8-2)=256-2^(6)=256-64=192
Thus, the mask is 192.0.0.0

 

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