How to configure Routers and Gateways?

49.How to configure Routers and Gateways?
Ans.
1. The router connected to each network is called its gateway.

2. IP forwarding is enabled by using following commands:
echo ”1” > /proc/sys/net/ipv4/ip_forward

3. If a system has two network interfaces, the network interfaces would be configured as shown below:

4. INTERFACE ADDRESS MASK
Eth0 192.168.1.1 255.255.255.128
Eth1 192.168.1.129 255.255.255.128

5. The network routing the system would use is as follows:
DESTINATION GATEWAY MASK INERFACE
192.168.1.0 192.168.1.1 255.255.255.128 eth0
192.168.1.128 192.168.1.129 255.255.255.128 eth1

6. To finish the changes we use following commands:
#route add –net 192.168.1.0
#route add default gw 192.168.129

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