Configuring 2 NIC for different network

deep27ak · 05-14-2013, 08:53 AM

Hello,

I have added 2 NIC cards in one of my CentOS machines.

Code:

eth0 : 10.10.10.x
eth1 : 192.168.0.x

Now the problem which I am facing is I am not able to ping eth1 from my client machines. In case I disable eth0 then eth1 becomes active and then I am able to ping eth1. But I want both the NICs to be enabled and I should be able to ping both of them from both the network.

I tried ip_forward as well but doesnot seems to be working.

Code:

# cat /proc/sys/net/ipv4/ip_forward
1

What am I missing?

Here are outputs of few commands

Code:

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.255.0   U     0      0        0 eth1
10.10.10.0      *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth1
default         192.168.0.235   0.0.0.0         UG    0      0        0 eth1

Code:

#ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:50:56:8A:22:B6
          inet addr:10.10.10.155  Bcast:10.10.10.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:13590 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2967 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1031558 (1007.3 KiB)  TX bytes:247007 (241.2 KiB)
          Interrupt:18 Base address:0x2024

eth1      Link encap:Ethernet  HWaddr 00:50:56:8A:14:E1
          inet addr:192.168.0.114  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7973 errors:0 dropped:0 overruns:0 frame:0
          TX packets:115 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:955557 (933.1 KiB)  TX bytes:13072 (12.7 KiB)
          Interrupt:16 Base address:0x20a4

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2858 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2858 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4320884 (4.1 MiB)  TX bytes:4320884 (4.1 MiB)

nini09 · 05-14-2013, 02:44 PM

A router is requested between client and CentOS machine to take care of forwarding between two networks. Otherwise, a correct route table have to be configure in client and CentOS machine.

deep27ak · 05-14-2013, 10:33 PM

Quote:

Originally Posted by nini09

a correct route table have to be configure in client and CentOS machine.

Can you help me out with this as I tried creating few route tables but couldn't make it.

nini09 · 05-15-2013, 02:16 PM

You need draw network topology. There are two networks on CentOS machine. How do these network connect with client machine?