Re: [LARTC] routing broadcast messages
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 ;> ; ;> ;> ___ ;> LARTC mailing list / [EMAIL PROTECTED] ;> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ ;> ; ; ; ;-- ;Eran Mann Direct : 972-4-9936297 ;Senior Software Engineer Fax : 972-4-9890430 ;Optical AccessEmail : [EMAIL PROTECTED] ; ; ; ; ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: [LARTC] routing broadcast messages
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 / [EMAIL PROTECTED] > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/ > -- Eran Mann Direct : 972-4-9936297 Senior Software Engineer Fax : 972-4-9890430 Optical AccessEmail : [EMAIL PROTECTED] ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: [LARTC] routing broadcast messages
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 / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: [LARTC] routing broadcast messages
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 / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
[LARTC] routing broadcast messages
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). simple pic. a.b.c.0/24--[ a.b.c.1, m.n.o.p ]---m.n.o.w How can i fix this problem?? It could be very cool tool to know, how many hosts are up in your netS. Combined with VPN from FreeS/WAN (he transports brdcast as other ip trafic) makes administration easier. thanks for help. PoltoS/ ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
