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network configuration

I’m using FreeBSD 7.2 on HP laptop and getting IP info via WI-FI router. I’ve setup hostname in /etc/rc.conf buy after the boot process, I check host name with "hostname" command, but get empty line. Setting hostname with "hostname" works well, but after reboot host name is still empty. I suspect it has something to do with DHCP settings. How do I set hostname-using DHCP?
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Q. How do I configure default router or gateway IP address under Ubuntu Linux / Debian Linux? How do I change default router / gateway IP under Ubuntu Linux?
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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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Setting Up a CentOS / Red Hat Linux DHCP Client

Q. How do I setup my Red Hat / CentOS / Fedora Linux system to get IP address and other information via a DHCP server for eth0 interface?
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Ubuntu Static IP

Q. I've Intel Corporation 80003ES2 LAN Gigabit Ethernet Controller. How do I set static IP address settings for my Ubuntu Linux as follows:

DEVICE name : eth0
Type: static
IP ADDR : 10.10.29.66
NETMASK : 255.255.255.192
Router IP: 10.10.29.65
Broadcast: 10.10.29.127

How do I setup static IP address under Ubuntu?
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Ubuntu Restart Networking Command

How do I restart networking on Ubuntu Linux system from a shell prompt?
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Q. How do I remove virtual interfaces such as eth0:1 or eth1:1?
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