From: eran@nbase.co.il (Eran Man)
To: lartc@vger.kernel.org
Subject: Re: [LARTC] routing broadcast messages
Date: Wed, 10 Jul 2002 12:42:23 +0000 [thread overview]
Message-ID: <marc-lartc-102630476928599@msgid-missing> (raw)
In-Reply-To: <marc-lartc-102626138529774@msgid-missing>
Hello All,
What your are trying to do is called "directed broadcast", and the linux
networking gods believe it is evil (i.e. a security hole) and should not
be implemented by routers. See
http://www.uwsg.iu.edu/hypermail/linux/net/9707.3/0030.html for example.
Eran.
Poltorak Serguei wrote:
> Hello
>
> but packets are going To their subnetwork. then m.n.o.w sends packet to
> a.b.c.255 gateways other than a.b.c.1 doesn't know that a.b.c.255 is a
> broadcast. it's only a.b.c.1 (m.n.o.p) who discards the packet
>
> may be I should redraw my pic.
> a.b.c.0/24,brd+ -----[ a.b.c.1, m.n.o.p ]-----m.n.o.w
> <-------pings are going in that direction
>
> So, packets are going TO their subnet.
>
> Any idea???
>
> thanks,
> PoltoS/
>
> On Wed, 10 Jul 2002, bert hubert wrote:
>
> ;On Wed, Jul 10, 2002 at 04:35:16AM +0400, Poltorak Serguei wrote:
> ;> Hello.
> ;>
> ;> I would like to route broadcast messages.
> ;> For now, if I ping a.b.c.255 from m.n.o.w the packet is passing through
> ;> each router, except the last, a.b.c.1 (m.n.o.p, other "external" address)
> ;> and only he replys to that packet, but not from a.b.c.1, he does it from
> ;> m.n.o.p address (logic, it's the address of the output interface).
> ;
> ;Broadcast messages don't leave their subnet. If you want that, you don't
> ;need a router but a bridge!
> ;
> ;Regards,
> ;
> ;bert
> ;
> ;--
> ;http://www.PowerDNS.com Versatile DNS Software & Services
> ;http://www.tk the dot in .tk
> ;http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
> ;
>
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
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>
--
Eran Mann Direct : 972-4-9936297
Senior Software Engineer Fax : 972-4-9890430
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next prev parent reply other threads:[~2002-07-10 12:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-10 0:35 [LARTC] routing broadcast messages Poltorak Serguei
2002-07-10 8:30 ` bert hubert
2002-07-10 10:03 ` Poltorak Serguei
2002-07-10 12:42 ` Eran Man [this message]
2002-07-14 0:40 ` Poltorak Serguei
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