Land and Cisco question

Mon Nov 24 08:17:12 UTC 1997

On Sun, 23 Nov 1997, Owen DeLong wrote:

> 
> > Randy Bush said:
> > > for each interface on a router
> > >   block tcp which is both to and from that interface
> > 
> > I don't think that's sufficient.  What about spoofed packets arriving via
> > interface A, with IP source and destination both set to the address of
> > interface B? 
> > 
> > --apb (Alan Barrett)
> > 
> > 
> If you do it with an access-list in then it doesn't matter.  Even a spoofed packet
> will be blocked prior to arriving where it can do harm.
> 
> Owen

Like the cat in the hat, but I think I follow.  I'll come back to this
when I'm well and hopefully I'll actually get what you're saying.  This
flu is killer.

Wait...  Ok.  So I could still kill external links, regardless of source
routing.  I was only thinking of internal links.  If I'm still wrong,
somebody let me know.

Joe Shaw - jshaw at insync.net
NetAdmin - Insync Internet Services.