Linux Routing and Forwarding experiment (soft routing)

One. Experimental network topology

(R1,R2 is implemented by adding a dual NIC to the Linux virtual machine for soft routing)

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Two. Environment Preparation:

(The virtual machine NIC needs to be set to bridging mode)

1. Close the NetworkManager:

Service Networknanager Stop

Disable Boot from:

Chkconfig Networknanager off

Empty the Iptables entry:

Iptables-f

Turn on Route forwarding: (0: Disabled, 1: Enabled)

Echo 1 >/proc/sys/net/ipv4/ip_forward

Check that the routing forwarding feature is turned on:

Cat/proc/sys/net/ipv4/ip_forward

Three. Configure the network card:

Configuration file:/etc/sysconfig/network-scripts/ifcfg-eth#

1. Delete ifcfg-eth# old profile and re-establish eth1, eth2 configuration

R1:

Eth1 (intranet):/etc/sysconfig/network-scripts/ifcfg-eth1

Device=eth1

Bootproto=none #禁用dhcp

ipaddr=192.168.48.1

Prefix=24

gateway=192.168.48.1

Eth2 (External network):/etc/sysconfig/network-scripts/ifcfg-eth2

Device=eth2

Bootproto=none #禁用dhcp

ipaddr=10.0.48.1

Prefix=8

gateway=10.0.48.1

R2:

Eth1 (intranet):/etc/sysconfig/network-scripts/ifcfg-eth1

Device=eth1

Bootproto=none #禁用dhcp

ipaddr=172.16.48.1

Prefix=16

gateway=172.16.48.1

Eth2 (External network):/etc/sysconfig/network-scripts/ifcfg-eth2

Device=eth2

Bootproto=none #禁用dhcp

ipaddr=10.0.48.2

Prefix=8

gateway=10.0.48.2

After the configuration is complete, you need to restart the network card:

Service Network restart

2. Add Routing information:

(Direct-attached network does not need to add routing information)

(Non-direct-attached network, GW is the nearest port IP for neighboring routes)

R1:

Route add-net 172.16.0.0/16 GW 10.0.48.2 Dev eth2

R2:

Route add-net 192.168.48.0/24 GW 10.0.48.1 Dev eth2

3. Test:

Add 192.168.48.0/24 and 172.16.48.0/16 in-network host, ping test can be

Linux Routing and Forwarding experiment (soft routing)