Introduction to Linux Routing and forwarding

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Requirements:

Need to let Linux01 access Linux03 through Linux02, convert Linux02 to a router.

Implementation steps:

(1) Preparation environment: LINUX01 (ip:10.0.0.10) Linux02 (dual Nic eth0:10.0.0.11 eth1:10.0.1.11) Linux03 (ip:10.0.1.10)

(2) Configure LINUX01, add route: Route add-net 10.0.1.0/24 gw10.0.0.11

(3) Configure Linux02, turn on the route forwarding function: echo "1" >/proc/sys/net/ipv4/ip_forward

(4) Configure Linux03, add route: Route add-net 10.0.0.0/24 gw10.0.1.11

(5) Turn off all firewalls

LINUX01:

[[email protected] ~]# traceroute -n 10.0.1.10traceroute to 10.0.1.10  (10.0.1.10), 30 hops max, 60 byte packets 1  10.0.0.11   0.188 ms  0.141 ms  0.113 ms 2  10.0.1.10   0.676 ms  1.081 ms  1.048 ms[[email protected] ~]# route  -nKernel IP routing tableDestination     Gateway          genmask         flags  Metric Ref    Use Iface10.0.0.0         0.0.0.0         255.255.255.0   U      0      0         0 eth010.0.1.0        10.0.0.11       255.255.255.0    UG    0      0         0 eth0169.254.0.0     0.0.0.0          255.255.0.0     U     1002    0        0 eth0

LINUX03:

[[email protected] ~]# traceroute -n 10.0.0.10traceroute to 10.0.0.10  (10.0.0.10), 30 hops max, 60 byte packets 1  10.0.1.11   3.137 ms  3.056 ms  3.000 ms 2  10.0.0.10   4.003 ms  3.981 ms  3.948 m[[email protected] ~]# route  -nKernel IP routing tableDestination     Gateway          genmask         flags  Metric Ref    Use Iface10.0.0.0         10.0.1.11       255.255.255.0   UG     0      0        0  eth010.0.1.0        0.0.0.0         255.255.255.0    U     0      0         0 eth0169.254.0.0     0.0.0.0          255.255.0.0     U     1002    0        0 eth0

This article is from the "wind and Rain Forest" blog, please make sure to keep this source http://fengyushanlin.blog.51cto.com/12092006/1959544

Introduction to Linux Routing and forwarding