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network admin

Q. My Oracle XE installation was working fine, but today I'm getting an error - which read as follows under Ubuntu Linux :

ORA-12154: TNS:could not resolve the connect identifier specified

How do I fix this problem without reinstalling Oracle?
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Ubuntu Change IP

Q. How do I change IP address under Ubuntu Linux using GUI and command line options?
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Where Does Linux Save Wireless Card Settings?

Q. I'd like to get more information about my wireless settings stored under CentOS / RHEL / Fedora Linux. Where Does Linux Save Wireless Card Settings?
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Router ARP Cache is Not Releasing Linux / UNIX Server IP address

Q. Recently we made changes to our server hardware and swapped all IP address from old to a new server. However, 2 IP addresses are not get updated due to arp cache issues (IPs are cached on the router). They are going to other servers. How do I solve this problem under Redhat Enterprise Linux version 5.0 or any other Linux distribution?
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Q. How do I find out the network path and/or router that is being used to reach a particular host on the internet?
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