07-22-2014
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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LEARN ABOUT MOJAVE
traceroute6
TRACEROUTE6(8) BSD System Manager's Manual TRACEROUTE6(8)
NAME
traceroute6 -- print the route IPv6 packets will take to a network node
SYNOPSIS
traceroute6 [-dIlnNrvU] [-f firsthop] [-g gateway] [-m hoplimit] [-p port] [-q probes] [-s src] [-w waittime] target [datalen]
DESCRIPTION
The traceroute6 utility uses the IPv6 protocol hop limit field to elicit an ICMPv6 TIME_EXCEEDED response from each gateway along the path to
some host.
The only mandatory parameter is the destination host name or IPv6 address. The default probe datagram carries 12 bytes of payload, in addi-
tion to the IPv6 header. The size of the payload can be specified by giving a length (in bytes) after the destination host name.
Other options are:
-d Debug mode.
-f firsthop
Specify how many hops to skip in trace.
-g gateway
Specify intermediate gateway (traceroute6 uses routing header).
-I Use ICMP6 ECHO instead of UDP datagrams.
-l Print both host hostnames and numeric addresses. Normally traceroute6 prints only hostnames if -n is not specified, and only numeric
addresses if -n is specified.
-m hoplimit
Specify maximum hoplimit, up to 255. The default is 30 hops.
-n Do not resolve numeric address to hostname.
-N Use a packet with no upper layer header for the probes, instead of UDP datagrams.
-p port
Set UDP port number to port.
-q probes
Set the number of probe per hop count to probes.
-r Bypass the normal routing tables and send directly to a host on an attached network. If the host is not on a directly-connected net-
work, an error is returned. This option corresponds to the SO_DONTROUTE socket option; it can be used to ping a local host through
an interface that has no route through it (e.g., after the interface was dropped by a routing daemon).
-s src Src specifies the source IPv6 address to be used.
-U Use UDP datagrams for the probes. This is the default.
-v Be verbose.
-w waittime
Specify the delay time between probes.
This program prints the route to the given destination and the round-trip time to each gateway, in the same manner as traceroute.
Here is a list of possible annotations after the round-trip time for each gateway:
!N Destination Unreachable - No Route to Host.
!P Destination Unreachable - Administratively Prohibited.
!S Destination Unreachable - Not a Neighbour.
!A Destination Unreachable - Address Unreachable.
! This is printed if the hop limit is <= 1 on a port unreachable message. This means that the packet got to the destination, but
that the reply had a hop limit that was just large enough to allow it to get back to the source of the traceroute6. This was
more interesting in the IPv4 case, where some IP stack bugs could be identified by this behaviour.
RETURN VALUES
The traceroute6 utility will exit with 0 on success, and non-zero on errors.
SEE ALSO
ping(8), ping6(8), traceroute(8)
HISTORY
The traceroute6 utility first appeared in WIDE hydrangea IPv6 protocol stack kit.
BSD
May 17, 1998 BSD