Re: [Linux-ATM-General] Multiple IP addresses on an ATM interface

[chas w. - C. <ch...@cm...>]

On Fri, 15 Jul 2011 08:33:15 -0700
"Sjoberg, Jon" <Jon...@go...> wrote:

> I'm trying to configure multiple IP addresses on the same physical ATM
> interface and VP.  In the system I have I need to be able to configure
> PVCs for all of the following on the same physical ATM interface:
> - Have two IP addresses in the same subnet but different PVC's
> - Have one IP address on a different subnet then the two above, also
> with its own PVC
> - Have multiple PVC's per IP address, each PVC to a different IP address
> - Have multiple AAL5 PVC's on the interface
>  
> For example I have the following PVCs, on one physical ATM interface:
> ENCODING    IP           VCI
> IPOA       10.20.30.1    100
> IPOA       10.20.30.2    101
> IPOA       192.168.20.1  103
> AAL5        -----        104
>  
> What commands would I need to get this through ATMAPR/ifconfig/etc.?  
>  
> I have tried using virtual interfaces (e.g. "atm0:0"), but the atmarp
> program does not seem ready for that so I suspect that was not the right
> way to go.

you probably want to use br2684ctl instead of atmarp.

first/second case you will likely need use routed mode on br2684ctl so
you can create a pointopoint ip interface and then use ifconfig to
setup the endpoints on each ip interface.  something like:

	br2684ctl -c 1 -p 0 -a 0.0.100 &
	br2684ctl -c 2 -p 0 -a 0.0.101 &
	ifconfig nas1 10.20.30.99 pointopoint 10.20.30.1
	ifconfig nas2 10.20.30.99 pointopoint 10.20.30.2

the third case:

	br2684ctl -c 3 -p 0 -a 0.0.103 &
	ifconfig nas3 192.168.20.2 pointopoint 192.168.20.1

the last case should be explain simply enough by the man page.
however, it is bridge mode not routed (-p 1).

you can still do this with atmarp and a clip interface however you dont
need to worry about atm0:0.  you can assign multiple ip address to the
same ip interface using the 'ip' command.