ICMP Attacks???????

Jay R. Ashworth jra at scfn.thpl.lib.fl.us
Fri Aug 22 22:09:21 UTC 1997

On Fri, Aug 22, 1997 at 02:42:42PM -0700, Joe Rhett wrote:
> > > I don't think that's a good idea.  The vast majority of routers that
> > > I sell to customers are not used in Internet applications, and to add
> > > another configuration step to enable the router to do what routers
> > > traditionally do by default would be very confusing to the end user.
> > You're saying that Corporate America *relies* on being able to to
> > IP source address spoofing through the routers it builds its commercial
> > private networks with?
> <sigh> No, I believe he's saying that corporate america comes in two
> flavors.
> 1) that isn't terribly clueful, and don't know how their packets route
> (scary how often you see this .. RIP-based networks that "just work")
> 2) Multi-path, decentralized network administration. So any given router
> will not be aware of all paths in the topology, and may route packets
> that it doesn't know how to return. Deliberately.
> Trust me, you don't know how your peer routes their traffic. Neither does
> sales know how the engineering department does in some cases. Or the
> backbone group knows all, and the department routers know nothing.

So far, so good.

> In any case, this logic used for this would have to be very complex.
> ..which would cause complex problems. I prefer simple manual editing.

No, not really.

> Actually, on the End-Of-Branch routers you could implement functions which
> say not to route anything coming through a given interface unless it is
> from that network. But this won't work on most branch router
> configurations. 

This was what I originally proposed, in the posting from which this
thread descended.  Did everyone miss it?

-- jra
Jay R. Ashworth                                                jra at baylink.com
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