Public Free DNS servers

Thanks to http://www.tech-faq.com/public-dns-servers.shtml

Public DNS Servers

Level 3 Communications (Broomfield, CO, US)

4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
4.2.2.5
4.2.2.6

Verizon (Reston, VA, US)

151.197.0.38
151.197.0.39
151.202.0.84
151.202.0.85
151.202.0.85
151.203.0.84
151.203.0.85
199.45.32.37
199.45.32.38
199.45.32.40
199.45.32.43

GTE (Irving, TX, US)

192.76.85.133
206.124.64.1

One Connect IP (Albuquerque, NM, US)

67.138.54.100

OpenDNS (San Francisco, CA, US)

208.67.222.222
208.67.220.220

Exetel (Sydney, AU)

220.233.167.31

VRx Network Services (New York, NY, US)

199.166.31.3

SpeakEasy (Seattle, WA, US)

66.93.87.2
216.231.41.2
216.254.95.2
64.81.45.2
64.81.111.2
64.81.127.2
64.81.79.2
64.81.159.2
66.92.64.2
66.92.224.2
66.92.159.2
64.81.79.2
64.81.159.2
64.81.127.2
64.81.45.2
216.27.175.2
66.92.159.2
66.93.87.2

Sprintlink (Overland Park, KS, US)

199.2.252.10
204.97.212.10
204.117.214.10

Cisco (San Jose, CA, US)

64.102.255.44
128.107.241.185

check rDNS

3 options to check rDNS

To test IP of 100.100.100.1

1) dig -x 100.100.100.1
2) host 100.100.100.1
3) nslookup 100.100.100.1

To test with specific DNS servers:
1) dig @dns_server_ip -x IP_of_server_to_lookup

Linux Permissions simplified for me

r = Read permissions = 4
w = Write permissions = 2
x = Excute permissions = 1

Total = 7

3 parts to permissions:

Part 1 = User
Part 2 = Group
Part 3 = World

So "rw-r--r--" = 644
and "rwx-r--r--" = 744
and "rwxrwxrwx" = 777
and "rwxr-xr-x" = 755

Create Random password

Linux and Mac-
Type:

$openssl rand -base 64 6

the last digit "6" will be the length of the password.

Postfix command -- helpful

postcat -q "msg id" to display the message within the cli.

Cooking

Cooking corn on the grill:

Peel all but the last layer of husks off of the corn. Cook on grill over high to medium heat. turn corn every 2 minutes for total of 10 minutes.

Very good corn!!!