Tip of the Day - Clearing Local Resolver Cache
In the name of performance Apple has in Tiger and Leopard decided that cacheing DNS lookups locally was a good idea. Normally it is, but when you are debugging DNS problems or changing DNS records it can be quite a pain if you forget about it. Well as long as you remember, its simple enough to clear the cache:
Tiger
lookupd -flushcache
Leopard
dscacheutil -flushcache
Solaris Static Network Configuration
Introduction
Consider a Solaris Server that you need as a DHCP and DNS server. The ideal configuration would be a static network config so that the IP address never changes. The best way to go about doing this is to configuring the following files. For the sake of argument let say we want the IP address of the server to be 172.16.0.100 with a Class C network mask. I have a Intel Pro 1000 Gigabit Ethernet card in my Solaris Server so the e1000g driver is used in the examples. Finally the hostname for this Solaris server will be called "solsrv"
Required Files
/etc/defaultrouter
/etc/inet/netmasks
/etc/nodename
/etc/hostname.e1000g0
/etc/resolv.conf
/etc/hosts
/etc/defaultrouter
172.16.0.1
/etc/inet/netmasks
172.16.0.0 255.255.255.0
/etc/nodename
solsrv
/etc/hostname.e1000g0
solsrv
/etc/resolv.conf
For my DNS server I use OpenDNS: http://www.opendns.org
nameserver 208.67.222.222
/etc/hosts
127.0.0.1 localhost
172.16.0.100 solsrv
IMPORTANT - Delete These Files
Finally remove these files using the following commands:
rm /etc/dhcp.e1000g0
rm /etc/dhcp/e1000g0.dhc
Tip of the Day - July 4, 2007 - DNS Settings and GoDaddy 1
When registering a domain at GoDaddy and not using their DNS servers make sure during the checkout process you enter your own nameservers. This will speed up the propagation time tremendously. It should take just a few minutes for your domain to be propagated with the correct DNS servers after you finish checking out.