[Netkit.users] Problem Network with 2 virtual machine connected to internet

[Massimo Rimondini]

Hi Christian,

this is actually a limit of the current release of Netkit. Quoting from the man page of vstart:

> There can be at most one ``tap'' collision domain for each user. Hence, if different virtual machines are configured for using ``tap'' connected interfaces, they also are on the same collision domain. TAP-ADDRESS is mandatory, but is only taken into account when a ``tap'' collision domain is first used (i.e., this is the first interface the current user ever connected to a ``tap'' collision domain). Otherwise, it simply ignored.
>

This means that you cannot automatically set up two independent TAP collision domains (with a different subnet for each collision domain). If you really want to achieve this, you need to set up the second domain manually, and then attach it to a virtual machine. Consider that the procedure to set up a TAP interface is implemented in file $NETKIT_HOME/bin/manage_tuntap.

Regards,
Massimo



On 04/24/2013 03:20 PM, Cristian Tatino wrote:
> Hi all,
>
> I'm new of netkit envoirement and I have created a network with these configuration:
>
> internet--A--B--C--internet
>
> A and B are connected to internet and in the lab.conf file i have put these line:
>
> A[1]=tap,192.168.42.1,192.168.42.2
> A[0]=HOME1
> B[1]=HOME2
> B[0]=HOME1
> C[0]=HOME2
> C[1]=tap,192.168.43.1,192.168.43.2
>
> in the A.stratup. i have written also this line:
> "route add defeault gw 192.168.42.1"
>
> and in the B.startup this:
> "route add defeault gw 192.168.43.1"
>
> When i run this network, i test the internet connections:
> I try a simply ping to 8.8.8.8 in this way: "ping -I eth1 8.8.8.8"
>
>
> It works for "A" but it doesn't work for "B"
>
> Does anyone have some ideas about?'
>
> Cheers,
>
> Cristian.
>
>
>
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