DNS Manipulation and other TCP/IP Bits

[tothomas]

Folks, recently I was doing some network troubleshooting and what I thought was an issue with my PIX Firewall turned out to be the fact that my DNS cache on my MAC needed to be flushed. I learned this by checking the issue in question on a windows machine and I have not heard the end of it by those who have yet to see the light. Thus I am looking for the equivalent commands to learn the following in terminal.

1. What is my ip address per interface
2. What is the DHCP server I am using
3. What are the DNS servers I am using
4. What is my default gateway

Yes I know some is available via the Network Preferences but it takes awhile to get there and if you use dhcp you cannot see many things there.

The above information is found in windows via the dos command "ipconfig /all" so that is the equivalent I am looking for.

Also the part that bit me is not knowing how to clear the DNS Cache on my mac so if anyone knows how to do that it would be appreciated. Thank you.