asked on

Network - Redhat Linux

I have two network

10.10.10.0/24 and 10.10.20.0/24

10.10.10.0 - two systems
10.10.10.33
10.10.10.37

10.10.20.0 - two system
10.10.20.2
10.10.20.3

I have another system which is connected 10.10.10.0/24 and 10.10.20.0/24 network

I want to be able to ping 10.10.20.2 maching from 10.10.10.0/24 network.

How do i setup static route. Please provide me the steps.

ittechlab

ASKER

from system(10.10.10.37) i did use this command

route add -net 10.10.20.0 netmask 255.255.255.0 gw 10.10.10.6 dev eth0

still not working. what is wrong here.

ittechlab

ASKER

[root@smtp ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:0C:29:09:87:50
inet addr:10.10.10.37 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe09:8750/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:151297 errors:0 dropped:0 overruns:0 frame:0
TX packets:5008 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:649322 (634.1 KiB) TX bytes:360510 (352.0 KiB)

[root@smtp ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.10.20.0 10.10.10.6 255.255.255.0 UG 0 0 0 eth0
10.10.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0

[root@smtp ~]# ping 10.10.20.4
PING 10.10.20.4 (10.10.20.4) 56(84) bytes of data.
64 bytes from 10.10.20.4: icmp_seq=1 ttl=64 time=0.335 ms
64 bytes from 10.10.20.4: icmp_seq=2 ttl=64 time=0.259 ms

But I am unable to ping 10.10.20.2.

From 10.10.20.4 system i can ping 10.10.20.2.

[root@smtp ~]# ping 10.10.20.2
PING 10.10.20.2 (10.10.20.2) 56(84) bytes of data.

odintsov

Hello,

Simpliest (but not dirty) way for your problem - set netmask to /16 255.255.0.0 and all systems can be in one subnet.

ittechlab

ASKER

I have many devices manually configured which i don't want to change. Is there any other better way. Why static route won' t work?

Network one - 10.10.10.0/24
Network two - 10.10.20.0/24

odintsov

U can show this command output from both devices?
ip route show

ittechlab

ASKER

[root@smtp ~]# ifconfig eth0 | grep inet
inet addr:10.10.10.37 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe09:8750/64 Scope:Link
[root@smtp ~]# ip route show
10.10.20.0/24 via 10.10.10.6 dev eth0
10.10.10.0/24 dev eth0 proto kernel scope link src 10.10.10.37
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
169.254.0.0/16 dev eth0 scope link metric 1002

[root@ns ~]# ifconfig eth0 | grep inet
inet addr:10.10.20.4 Bcast:10.10.20.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:febb:a670/64 Scope:Link
[root@ns ~]# ifconfig eth2 | grep inet
inet addr:10.10.10.6 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:febb:a684/64 Scope:Link
[root@ns ~]# ip route show
10.10.20.0/24 dev eth0 proto kernel scope link src 10.10.20.4
192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.18
10.10.10.0/24 dev eth2 proto kernel scope link src 10.10.10.6
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
169.254.0.0/16 dev eth0 scope link metric 1002
169.254.0.0/16 dev eth1 scope link metric 1003
169.254.0.0/16 dev eth2 scope link metric 1004
default via 192.168.0.254 dev eth1

[root@mail ~]# ifconfig eth0 | grep inet
inet addr:10.10.20.2 Bcast:10.10.20.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:feaf:56f7/64 Scope:Link
[root@mail ~]# ip route show
10.10.20.0/24 dev eth0 proto kernel scope link src 10.10.20.2
10.10.10.0/24 via 10.10.20.4 dev eth0
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
169.254.0.0/16 dev eth0 scope link metric 1002
default via 10.10.20.1 dev eth0

I want able to ping from 10.10.10.37 to 10.10.20.2 AND
from 10.20.10.2 to 10.10.10.37 vice versa.

I am using ns system as router which have access to both network.

odintsov

All routing configuration fine (mail: 10.10.10.0/24 via 10.10.20.4 smtp: 10.10.20.0/24 via 10.10.10.6).

May u need enable forwarding on ns node:
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

Can u see forwarded packet in iptables (iptables -nvL FORWARD)?

ittechlab

ASKER

route add -net 10.10.20.0 netmask 255.255.255.0 gw 10.10.10.6 dev eth0

How do i make this permanent.

odintsov

Hello,

U need create files: /etc/sysconfig/network-scripts/route-eth0 on both servers with following contents:
10.10.20.0/24 via 10.10.10.6 dev eth0
and
10.10.10.0/24 via 10.10.20.4 dev eth0

ASKER CERTIFIED SOLUTION

Kerem ERSOY

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