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network configuration

ifconfig Command Does Not Show IPv4 Address

ifconfig command does not show IP address on my Linux based laptop computer. How do I fix this problem?
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Linux Static IP Address Configuration

How do I configure the Internet Protocol version 4 (IPv4) properties of a network connection with a static IP address for servers running Linux operating systems? How do I configure static IP address under Debian Linux or Redhat / RHEL / Fedora / Redhat Enterprise Linux server?
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How do I display a list of bridges under Linux? How do I show info about the Ethernet bridge configuration in the Linux kernel?
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Ubuntu: SIOCADDRT: File exists Error and Solution

I'm typing the following command under Ubuntu Linux:

route add default gw 192.168.3.2 eth0

But it is giving me out the following error:

SIOCADDRT: File exists

How do I fix this problem?
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The NAT based connectivity is useful for easy deployments. However I want to use full bridging, where the guest is connected directly to the LAN. How do setup and share physical network with host and rest of the LAN under Linux?
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When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:

TTL Expired In Transit

How do I fix this problem?
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Where are NIC (network interface configuration) files located in the Redhat / Fedora / Centos Linux?
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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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