Internet using dialup modem in Command line

WvDial - A command-line pppd driver

# wvdialconf
# wvdialconf wvdial.conf
Once you have run wvdialconf, you need to edit the /etc/wvdial.conf file to enter the phone number to dial, and your username and password.
Open up /etc/wvdial.conf in your favorite text editor.
It should look something like this:
[Dialer Defaults]
Modem = /dev/ttyS1
Baud = 115200
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 S11=55 +FCLASS=0
Phone = 13125222
Username = shahbaz
Password = password
Remove the ';' and fill in the appropriate fields- phone number, login name and password.
Now you should be all set to run wvdial.

Run wvdial.
Assuming that you filled in your phone number, username, and password correctly, wvdial will now dial your ISP.
wvdial will not exit until the connection is terminated- you can do a Ctrl-C to terminate it.

# wvdial

Redhat Linux DHCP Server Configuration Guide

Linux Based DHCP server is controlled by dhcpd daemon (Disk Access and Execution Monitor). It main configuration file is placed in /etc/dhcpd.conf. But remember you will find this file in /etc because you will have to manually create it or copy it from dhcpd server sample file.

Steps for Redhat Linux based dhcp server.
1. Assign a static ip address to linux server. Using netconfig or ifcfg
2. Check if dhcp server is installed.
rpm -q dhcp
you will notice that dhcp-3.xxxx result will be displayed.

3. copy the dhcpd.conf file from sample documentation.
cp /usr/share/doc/dhcp-3.3/dhcpd.conf.sample /etc/dhcpd.conf

4. Now open this sample file by using vi /etc/dhcpd.conf and a very simple dhcp configuration is given below. It works for most of the Home or Office networks. Advance users may configure more options as per their requirements.

ddns-update-style interim
ignore client-updates

subnet 192.168.1.0 netmask 255.255.255.0 { # Our subnet

range 192.168.1.201 192.168.1.220; # our range
default-lease-time 86400;
max-lease-time 86400;
option routers 192.168.1.1; # our router or gateway
option ip-forwarding off;

# You can also assign specific IP addresses based on the clients'
# ethernet MAC address as follows (Host's name is "laser-printer":

host laser-printer { # client reservation
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 192.168.1.222;
}
}

Step.5 is save the file by using :wq in vi command
step.6 # service dhcpd start [OK]
---------------------------------------------------------------
Step 7 For monitoring of dhcp server startup
cat /var/log/messages

step 8. cat /var/lib/dhcp/dhcpd.leases file contains the assinged ipaddress of the server.
step 9 # chkconfig --level 35 dhcpd on this command will start dhcp server on every boot.

Free MCSE MCITP MCTS CCNA CCNP RHCT RHCE Step by Step Guides

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