Re: First line in /etc/hosts
On Wed, 23 Feb 2005, Paul Hampson wrote:
> On Sat, Feb 19, 2005 at 12:13:34AM -0200, Henrique de Moraes Holschuh wrote:
> > Also: As far as the kernel is concerned, any local IP is local to *all*
> > interfaces, and it will happly reply to it (ARP and so on) if allowed to.
> > The rp_filter will often avoid trouble here, BUT routers often have to
> > disable rp_filter. So add some rules to the firewall make sure nothing gets
> > into 127.0.0.0/8 unless it is a local packet.
> Can't you just leave rp_filter on for lo, or disable it only on those
> interfaces on which you are likely to see asymmetric routes arriving?
Yes. But rp_filter won't get all instances of trouble trying to reach lo
through some other interface, I think.
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