Re: [LARTC] routing broadcast messages

[Poltorak Serguei <poltorak@df.ru>]

Hello.

this is Kuznetsov's point of view of 1997 :)
I think it might change. Why not to implement this feature as optional
thing, like syn cookies, that you are to enable. Sometimes this is a
security hole, but sometimes - not. I need this to do a tunnel between two
networks with windoze inside. I don't want to set up a wins or something
else, it's easyer to let broadcast packets traverse through my tunnel,
that need directed broadcast routing. I know, it's a little bit stupid to
support buggy software like netbios, but sometimes it's worth...

PoltoS/

;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
;> ;
;> 
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;
;-- 
;Eran Mann                 Direct  : 972-4-9936297
;Senior Software Engineer  Fax     : 972-4-9890430
;Optical Access            Email   : emann@opticalaccess.com
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