system-config-network

You can also edit the following files and ‘service network restart’.

/etc/sysconfig/network
/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/resolv.conf

system-config-network is a GUI, isn’t it? (I don’t use it so I’m not sure.)
To make changes permanent, you would follow Gerald_Clark’s suggestions. There might also be a system-config-network-tui, IIRC, a text mode interface.

The syntax of what you want to do with ifconfig will only stay in effect until the machine is restarted but the commands are

To change eth0 to 192.168.1.20 with a 24 bit (25.255.255.0) netmask and a gateway of 192.168.1.1

ifconfig eth0 192.168.1.20 netmask 255.255.255.0 up
route add -net 192.168.1.0 netmask 255.255.255.0 eth0
route add default gw 192.168.1.1

(The up at the end of the first line and the route add -net line aren’t always necessary, but shouldn’t hurt anything.)

Or, the more modern ip command. (Seems that I read somewhere that ifconfig is deprecated and you’re supposed to use ip but I could be very wrong about that.)

ip addr add 192.168.1.20/24 dev eth0
ip route add default via 192.168.1.1

Now that you have the examples, take a look at the man page and see if you can figure out how it works. I remember, when I was new to all this, finding the man page somewhat difficult to follow for these three commands. Now, they seem simple to me, so it’s very difficult for me to judge. I do feel they would be better if they added examples like the various BSD ifconfig man pages do. Actually the ip command has a document (it’s in ps, so you probably have to use evince to view it) in /usr/share/doc/iproute that does give examples.

# echo 200 chao >> /etc/iproute2/rt_tables# ip rule add from 192.168.1.101 table chao
# ip rule ls
0:    from all lookup local
32765:    from 10.0.0.10 lookup chao
32766:    from all lookup main
32767:    from all lookup default

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