[Netkit.users] Interface problem.-

[Massimo Rimondini]

Hi Miguel,

you seem to have duplicate IP addresses in your configuration. In fact, 
195.11.14.5 is assigned to both vrouter1's tap interface and to pc1 (or 
pc2).

When you configure a tap interface, you have to specify two IP addresses:
- The "tap" address, which is the address of a fictitious network 
interface on the real host (you can even see it by using ifconfig on the 
real host). This interface serves as a connection point between vrouter1 
and the real network. Since this is the address of a new network 
interface, it cannot overlap with other existing addresses.
- The "guest" address, which is the address of a network interface 
showing up inside the virtual machine (vrouter1).

Uniqueness of IP addresses should however still be guaranteed.

I suggest to remove this problem before further analyzing the issue.

Regards,
Massimo.

Miguel Angel Ruiz wrote:

>  Hi Fabio,
>
>  
>
>  I have two problems;
>
>  
>
>  
>
>  
>
>     First: 
> _____________________________________________________________________________
>
>  
>
> *Pc1(real host)*----------------------*Pc2(real host)*
>
>                                                                  
> |------Vrouter1------Vrouter2
>
>  
>
>  
>
> -         First, profit that pingueen both between realhosts.
>
>             [root Pc1]#ping 195.11.14.1 .....ok.-
>
> [root Pc1]#ping 195.11.14.5 .....ok.-
>
> [root Pc2]#ping 195.11.14.5 .....ok.-
>
> [root Pc2]#ping 195.11.14.1 .....ok.-
>
>  
>
>  [root Pc2]#*vstart vrouter1 -eth0=tap,195.11.14.5,195.11.14.9 -eth1=A 
> -new*
>
> that it creates vrouter1, but,....
>
> [vrouter1]# ping 195.11.14.5   .....fail.-
>
> [root Pc2]# ping 195.11.14.9   .....fail.-
>
> [vrouter1]#*route -n *
>
>      Kernel ip routing table
>
> Destination     Gateway       Genmask         Flags      Metric      
> Ref     Use     Iface
>
> 195.11.14.0     0.0.0.0         255.255.255.0   U           0   
>             0       0          eth0
>
>     0.0.0.0        195.11.14.5    0.0.0.0              UG       
> 0               0        0         eth0
>
> [vrouter1]# *router add -net 195.11.14.0 netmask 255.255.255.0 eth0*
>
> [vrouter1]# ping 195.11.14.5   .....fail.-
>
> [vrouter1]# *vlist*
>
>    user              vhost                pid                   
> uptime        size                  interfaces
>
>    root              vrouter1            10795                
> 18:21           12312    eth0 @ tap, eth1 @ A
>
>  
>
> [root Pc2]#*vstart vrouter2 -eth0=A   --eth1=B   --new*
>
> [vrouter2]#*ifconfig eth0 195.11.14.11 up*
>
> [vrouter2]# *router add -net 195.11.14.0 netmask 255.255.255.0 eth0*
>
> [vrouter1]# *router add -net 195.11.14.0 netmask 255.255.255.0 eth1*
>
> [vrouter2]#ping 195.11.14.10 .....ok.-
>
> [vrouter2]#ping 195.11.14.9   .....ok.-
>
> [vrouter2]#ping 195.11.14.5   *.....fail.-*
>
>  
>
>  
>
> second:  
> __________________________________________________________________________
>
> ** 
>
> *Pc1(real host)*----------------------*Pc2(real host)*
>
>                                                                  
> |-----Vrouter1-------Vrouter2
>
>  
>
> - If start in first place, (#ifconfig..... only show a loopback), and 
> not,... ifconfig eth0,.. eth1. with ip number.-
>
>      
>
>  [root Pc2]#*vstart vrouter1 -eth0=tap,195.11.14.5,195.11.14.9 -eth1=A 
> -new*
>
>  
>
>  
>
>  , then, i can reach with ping Pc2--->Vrouter1
>
>                but, lost connectivity  
> Pc1(realhost)---------------->Pc2(realhost)  ,   and Pc2 -beyond- to 
> Vrouter1. (At  Vrouter1 it arrives).
>
>  
> ____________________________________________________________________________________________
>  
>  
> Please, if can send some configuration - that has proven -.
>  
>  
> Regards,
> Michael Angel
>  
>  
>  
>  
>  
>  
> ----- Original Message -----
> From: "Fabio Ricci" <ribio a tiscali.it <mailto:ribio a tiscali.it>>
> To: "Users of the Netkit Network Emulation System" 
> <netkit.users a did.dia.uniroma3.it 
> <mailto:netkit.users a did.dia.uniroma3.it>>
> Cc: <Netkit.users a did.dia.uniroma3.it 
> <mailto:Netkit.users a did.dia.uniroma3.it>>
> Sent: Thursday, January 05, 2006 1:23 PM
> Subject: Re: [Netkit.users] Interface problem.-
>
> > Hi Miguel,
> > you have to configure your routing tables,
> > please send the starting command for  virtual hosts, and the output of
> > command "ifconfig && route -n" on your host and virtual hosts
> >
> > bye
> > Fabio
> >
>
>------------------------------------------------------------------------
>
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>  
>
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