Re: Directed Broadcasts
From: JR (contactjrnow@hotmail.com)
Date: 12/19/02
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From: "JR" <contactjrnow@hotmail.com> Date: Thu, 19 Dec 2002 15:34:17 -0500
"JR" <contactjrnow@hotmail.com> wrote in message
news:p5qM9.50457$lj.1234475@read1.cgocable.net...
> I'm kind of suprised that there has been no mention of M$ ISA Server. I am
> personally not a M$ fan, but it is fairly tight.
> Price should not be an issue, as ISA is no where near as expensive as W2K
> Adv Server, so it normally can be acquired from the same locations :)
> JR
>
>
>
> "Mark Moore" <lists@circleox.com> wrote in message
> news:c728b397.0212190907.5c246104@posting.google.com...
> > WINs will not solve my problem. I need my VPLS to get UDP broadcasts.
> > I understand the issues behind disabling directed broadcasts on
> > routers, but what I do not understand is why a VPLS falls into this
> > category. Once connected, it should be considered as part of the
> > trusted network and therefore recieve broadcast traffic (IMO).
> >
> > ~mark
> >
> >
> > "shope" <stephen_hope@ntlworld.xx.com> wrote in message
> news:<zW4M9.3544$V81.90020@newsfep1-gui.server.ntli.net>...
> > > "Mark Moore" <lists@circleox.com> wrote in message
> > > news:c728b397.0212180743.16194c01@posting.google.com...
> > > > I am currently setting up a VPN (using Win 2000 Server now, but plan
> > > > to move to FreeSWAN eventually). Clients connected to the VPN do
not
> > > > get directed broadcasts. Anyone have any idea why?
> > >
> > > The VPN boxes act as routers. Routers are not supposed to forward
> directed
> > > broadcasts by default, and many do not let you turn this feature on at
> all.
> > >
> > > A long time ago routers used to forward directed broadcasts by
default.
> > >
> > > However, attacks using a broadcast address and spoof source IP used
this
> to
> > > do denial of service on Internet hosts, so the standards were changed
so
> > > that directed broadcasts had to be off by default. It also tended to
> cause
> > > major broadcast storms where there were dual routers between subnets
for
> > > resilience.
> > >
> > > On a full function router you can usually turn this on interface by
> > > interface (all the cisco routers and L3 switches that i have worked on
> > > support this).
> > >
> > > The most common reason for this is to support etBIOS over IP in a
> microsoft
> > > environment - you can get equivalent functionality by using a WINs
> server as
> > > a central name to address translation cache - search microsoft for the
> > > various papers they have written on using WINs.
>
>
Sorry wrong thread.....need coffee
JR
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