Date: Mon, 19 Feb 2001 03:49:42 -0800 From: Julian Elischer <julian@elischer.org> To: Satyajeet Seth <sseth@sasken.com> Cc: net@freebsd.org Subject: Re: Using netgraph to implement pseudo interfaces Message-ID: <3A910856.CE68FEAC@elischer.org> References: <Pine.GSO.4.30.0102171456150.21367-100000@suns3.sasi.com>
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Satyajeet Seth wrote:
>
> Hi
>
> I wished to implement pseudo interfaces with the following requirements:
>
> 1. There is a ethernet interface fxp0 having MAC address MAC0. It also
> receives packets with destination MAC address MAC1 and MAC2.
>
> 2. The packets with destination MAC address MAC1 are sent to a pseudo
> interface 1 and packets with destination MAC address MAC2 are sent to
> pseudo interface 2.
>
> 3. The packets addressed to MAC0 should be sent to sent to fxp0.
>
> I plan to design a netgraph as follows:
>
> iface1
> /
> fxp0 <-> bpf
> \
> iface2
I forgot to add in my previous response that you'd have to do this like:
fxp0: <--> bpf <--> bpf <--> interface0
\ \
\ ------>interface1
\
\------------>interface2
as each bpfnode hook only selects between a
"match" and "no match" hook.
you could do it with one node as follows:
+----------------------------+
| |
+->(hook2)[ ] |
fxp0:(lower)<->(hook1)[bpf](nomatch1)----+
[ ](match1)<-------->(upper)fxp0:
[ ](nomatch2)<------>(hook)iface1:
[ ](match2)<-------->(hook)iface2:
i.e. loop the data back through the same node twice to effect two rules on
the same data.
>
> fxp0, iface1, iface2, bpf are nodes of type ng_ether, ng_iface, ng_iface
> and ng_bpf respectively.
>
> The packets with destination addresses MAC1 and MAC2 are sent to
> interfaces iface1 and iface2 respectively by bpf. Remaining are sent to
> fxp0.
>
> Could you suggest some pitfalls/improvements in the above scheme?
>
> I am using FreeBSD 4.0.
>
> Thanks
> Satya
>
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