Broadcast redirecting

Broadcast redirecting

[Anatoly Muliarski]

Hi list,

Is it possible to redirect broadcast packets( with dst 255.255.255.255
) received on one interface to another?
Or should I use some standalone program?

-- 
Best regards
Anatoly Muliarski

Re: Broadcast redirecting

[Federico Alberto Sayd]

Anatoly Muliarski escribió:
> Hi list,
>
> Is it possible to redirect broadcast packets( with dst 255.255.255.255
> ) received on one interface to another?
> Or should I use some standalone program?
>
>   
brouting with ebtables??
arp proxy??

Re: Broadcast redirecting

[Anatoly Muliarski]

2010/5/13 Federico Alberto Sayd <fsayd@uncu.edu.ar>:
>>
>> Is it possible to redirect broadcast packets( with dst 255.255.255.255
>> ) received on one interface to another?
>> Or should I use some standalone program?
>>
>>
>
> brouting with ebtables??
> arp proxy??

Thanks, but for some reasons I cannot use bridging.
And ARP proxy works for ARP packets only.

May be, the problem consists in routing code which does not allow to
redirect broadcast packets.

Also I can write some daemon in Perl which will receive broadcast
packets and inject them on another interface. But the source address
of the injected packets will belong to the router and I need them to
be as in original packets.

-- 
Best regards
Anatoly Muliarski

Re: Broadcast redirecting

[Anatoly Muliarski]

2010/5/13 Curby <curby@cur.by>:
> On Thu, May 13, 2010 at 12:22 PM, Anatoly Muliarski <x86ever@gmail.com> wrote:
>> Also I can write some daemon in Perl which will receive broadcast
>> packets and inject them on another interface. But the source address
>> of the injected packets will belong to the router and I need them to
>> be as in original packets.
>
> I'm no good at Perl but I think it has an interface to hping, which
> can be used to craft (or mangle?) packets as you please.  May be
> something to look into.
>
> --Mike
>

Thanks for the idea, I'll try to have a look into it.

Currently, I have investigated using brouting - it looks more attractive.
The idea consists in mostly using L3, but treating broadcast on L2.

Here is a sketch:
brctl addbr br0
brctl stp br0 off
brctl addif br0 eth0
brctl addif br0 eth1
ifconfig br0 0.0.0.0
ebtables -t broute -A BROUTING -p IPv4 --ip-dst 255.255.255.255 -j ACCEPT
ebtables -t broute -A BROUTING -j DROP

I should try it later.



-- 
Best regards
Anatoly Muliarski

Re: Broadcast redirecting

[Anatoly Muliarski]

2010/5/13 Mistick Levi <gmistick@gmail.com>:
> You could spoof the packet:
> http://www.pythonprasanna.com/Papers%20and%20Articles/Sockets/udpspoof_pl.txt
>
> Best regards
> Levi Yechiel
>

Thanks, that is a valuable advice!


-- 
Best regards
Anatoly Muliarski

Re: Broadcast redirecting

[Jan Engelhardt]

On Thursday 2010-05-13 19:25, Federico Alberto Sayd wrote:

> Anatoly Muliarski escribió:
>> Hi list,
>>
>> Is it possible to redirect broadcast packets( with dst 255.255.255.255
>> ) received on one interface to another?
>> Or should I use some standalone program?
>
>
> brouting with ebtables??
> arp proxy??

2x No.

Broadcasts are not routed.