Routing Problem

sunveer · 10-19-2012, 08:54 AM

Again not getting things to work. Need you help..

I have setup two different machines (PC and a Laptop) and one KVM in each machine.

Setup is like this >>

Server A

Code:

IP: 172.24.0.254
Gateway: 172.24.0.254

Server A has a virtual machine Virtual A (Isolated Network not bridge or NAT)
Virtual A

Code:

IP: 10.4.0.4
Gateway: 10.4.0.4

Server B

Code:

IP: 172.24.0.3
Gateway: 172.24.0.3

Server B has a virtual machine Virtual B (Isolated Network not bridge or NAT)
Virtual B

Code:

IP: 10.3.0.3
Gateway: 10.3.0.3

I have disabled Firewall on all ServerA,B and VirtualA,B to try initial setup and checked using

Code:

iptables -L

to see if disabled

I have set

Code:

net.ipv4.ip_forward = 1

I can ping Server A from Server B and Server B from Server A as they are on same network.
Server A can ping Virtual A and Virtual A can ping Server A as I have setup route to Server A in Virtual A because Virtual A has isolated network.

Similarly, Server B can ping Virtual B and Virtual B can ping Server B.

Now my final motive is to ping Virtual B from Server A.

As per the concept I have setup a route on Server A as follows:

Code:

ip route add 10.3.0.0/24 via 172.24.0.3

Code:

[root@server network-scripts]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.24.0.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.4.0.0        0.0.0.0         255.255.255.0   U     0      0        0 virbr0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.3.0.0        172.24.0.3      255.255.255.0   UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
0.0.0.0         172.24.0.254    0.0.0.0         UG    0      0        0 eth0

As per this I must be able to ping Virtual B from Server A, however pinging 10.3.0.3 from Server A doesn't show any reply.

Code:

[root@server network-scripts]# ping 10.3.0.3
PING 10.3.0.3 (10.3.0.3) 56(84) bytes of data.
^C
--- 10.3.0.3 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5981ms

[root@server network-scripts]#

However, I can ping 10.3.0.1 from Server A.

Please help me to achieve the motive.

nini09 · 10-19-2012, 02:39 PM

Is VM of virtual B same as virtual A? The different VM may use different way to routing traffic between virtual machine and physical machine.

sunveer · 10-20-2012, 02:27 AM

Quote:

Originally Posted by nini09

Is VM of virtual B same as virtual A? The different VM may use different way to routing traffic between virtual machine and physical machine.

Both have same KVM.

hamlindsza · 10-20-2012, 08:22 AM

Hi Sunveer,

You will need to change your Virtual Machine's (Virtual A & B) Network Adapter settings to Bridge mode. And then check on Server A & Server B if a route to corresponding VM networks are present.

sunveer · 10-20-2012, 08:30 AM

Quote:

Originally Posted by hamlindsza

Hi Sunveer,

You will need to change your Virtual Machine's (Virtual A & B) Network Adapter settings to Bridge mode. And then check on Server A & Server B if a route to corresponding VM networks are present.

But if I will set kvm's network to bridge mode then they will not have different network but will have IP of server A or server B in the range 172.24.0.0 and not in separate ranges.

nini09 · 10-22-2012, 02:26 PM

If virtual machine B is same as virtual machine A, it should be working on virtual machine B. Maybe you should configure networking mode of virtual machine B to bridge at first to make sure virtual machine is Ok.
By the way, what mode do you use for your setup?

sunveer · 10-23-2012, 06:27 AM

Problem is Solved.

on Virtual Machines gateway must be

Code:

10.3.0.1

Code:

10.4.0.1