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Special Forums IP Networking Force routing between three hosts Post 302910058 by mcanonic on Tuesday 22nd of July 2014 07:54:12 AM
Old 07-22-2014
Question Force routing between three hosts

Hi,
I'm having problem trying to create the following scenario: VM1 <--> VM2 <--> VM3

where VM1, VM2 and VM3 are virtual machines and VM1 and VM3 have to pass trough VM2 to "talk" each other.

The best solution should be change the default gateway of VM1 and VM3 by pointing it to VM2 IP address.


For this reason, I've tried to add a new default gateway (route add default gw <VM2_IP>) and then I tried to delete the old default gateway but it is not working.

I've also tried to add a new route for VM3 in VM1:
route add -host <IP_VM3> gw <IP_VM2>
but in this case the VM3 is unreachable from VM1.

How can I do it?
Is there any specific procedure since they are VMs and not physical machine?

Thanks,
Massimo
 

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OCF_HEARTBEAT_ROUTE(7)						OCF resource agents					    OCF_HEARTBEAT_ROUTE(7)

NAME
ocf_heartbeat_Route - Manages network routes SYNOPSIS
Route [start | stop | monitor | reload | meta-data | validate-all] DESCRIPTION
Enables and disables network routes. Supports host and net routes, routes via a gateway address, and routes using specific source addresses. This resource agent is useful if a node's routing table needs to be manipulated based on node role assignment. Consider the following example use case: - One cluster node serves as an IPsec tunnel endpoint. - All other nodes use the IPsec tunnel to reach hosts in a specific remote network. Then, here is how you would implement this scheme making use of the Route resource agent: - Configure an ipsec LSB resource. - Configure a cloned Route OCF resource. - Create an order constraint to ensure that ipsec is started before Route. - Create a colocation constraint between the ipsec and Route resources, to make sure no instance of your cloned Route resource is started on the tunnel endpoint itself. SUPPORTED PARAMETERS
destination The destination network (or host) to be configured for the route. Specify the netmask suffix in CIDR notation (e.g. "/24"). If no suffix is given, a host route will be created. Specify "0.0.0.0/0" or "default" if you want this resource to set the system default route. (required, string, no default) device The outgoing network device to use for this route. (optional, string, no default) gateway The gateway IP address to use for this route. (optional, string, no default) source The source IP address to be configured for the route. (optional, string, no default) table The routing table to be configured for the route. (optional, string, no default) SUPPORTED ACTIONS
This resource agent supports the following actions (operations): start Starts the resource. Suggested minimum timeout: 20. stop Stops the resource. Suggested minimum timeout: 20. monitor Performs a detailed status check. Suggested minimum timeout: 20. Suggested interval: 10. reload Suggested minimum timeout: 20. meta-data Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5. validate-all Performs a validation of the resource configuration. Suggested minimum timeout: 20. EXAMPLE
The following is an example configuration for a Route resource using the crm(8) shell: primitive example_Route ocf:heartbeat:Route params destination=string op monitor timeout="20" interval="10" depth="0" SEE ALSO
http://www.linux-ha.org/wiki/Route_(resource_agent) AUTHOR
Linux-HA contributors (see the resource agent source for information about individual authors) resource-agents 1.0.3 07/05/2010 OCF_HEARTBEAT_ROUTE(7)
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