Should routers send redirects by default?
nanog at 85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org
Fri Aug 20 20:52:48 CDT 2010
On Fri, 20 Aug 2010 21:24:43 -0400
"Ricky Beam" <jfbeam at gmail.com> wrote:
> On Fri, 20 Aug 2010 20:43:39 -0400, Mark Smith
> <nanog at 85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org> wrote:
> > You're assuming the cost of always hair pinning traffic on an interface
> > is cheaper than issuing a redirect.
> I am saying no such thing. (a single redirect packet is always more
> efficient.) I *am* saying ICMP redirects are a mistake that should not be
> replicated in IPv6. They are too easy to abuse, which is why they are
> almost universally ignored by IPv4 hosts.
I thought we were talking about IPv6 redirects not IPv4 ones. How much
do you know about their operation and purposes?
> In a *properly* configured network, redirects should not be necessary.
> (everything on the local LAN should know what's on the local LAN.) [For
> the record, my own networks don't follow that rule. :-) Coworkers throwing
> random crap on the wire doesn't help. *sigh* Don't go there.]
> IPv6 has more than enough mistakes glued into it. Redirects are a mess
> that does not need to be there. For the purests who insist on making ugly
> networks that are trival to subvert, make ICMPv6 redirects *OPTIONAL*,
> *REQUIRING* explicit configuration to enable. Without strong
> authentication/authorization mechanisms, it'll be the same mess that it is
> in IPv4.
Know anything about IPv6 SeND?
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