nanog mailing list archives
Re: Common operational misconceptions
From: Mark Andrews <marka () isc org>
Date: Thu, 16 Feb 2012 15:27:39 +1100
In message <4F3C76D5.9040603 () necom830 hpcl titech ac jp>, Masataka Ohta writes:
Mark Andrews wrote:This doesn't prove that IPv6 is not operational. All it proves is people can misconfigure things.How do operators configure their equipments to treat ICMP packet too big generated against multicast and unicast?
Well you need to go out of your way to get a ICMP PTB for IPv6 multicast as the default is to fragment multicast packets at the source at network minimum mtu (RFC3542 - May 2003). That's not to say it won't happen. As for generation of PTB you rate limit them the way you do for IPv4.
Note that, even if they do not enable inter-subnet multicast in their domains, the ICMP packets may still transit over or implode within their domains. Note also that some network processors can't efficiently distinguish ICMP packets generated against multicast and unicast.
And why do you need to distingish them? You look at the inner packet not the ICMP source if you want to rate limit return traffic.
Masataka Ohta
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: Common operational misconceptions, (continued)
- Re: Common operational misconceptions Justin M. Streiner (Feb 16)
- Re: Common operational misconceptions Tony Tauber (Feb 16)
- Re: Common operational misconceptions Masataka Ohta (Feb 15)
- RE: Common operational misconceptions Nathan Eisenberg (Feb 15)
- Re: Common operational misconceptions Steve Bertrand (Feb 15)
- Re: Common operational misconceptions Mark Andrews (Feb 15)
- Re: Common operational misconceptions Masataka Ohta (Feb 15)
- Re: Common operational misconceptions Charles Mills (Feb 15)
- Re: Common operational misconceptions John Kristoff (Feb 16)
- Re: Common operational misconceptions Tony Tauber (Feb 16)
- Re: Common operational misconceptions Mark Andrews (Feb 15)
- Re: Common operational misconceptions Masataka Ohta (Feb 15)
- RE: Common operational misconceptions Nathan Eisenberg (Feb 15)
- Re: Common operational misconceptions Steve Bertrand (Feb 15)
- Re: Common operational misconceptions sthaug (Feb 16)
- Re: Common operational misconceptions Mark Andrews (Feb 16)
- Re: Common operational misconceptions Jeroen Massar (Feb 16)
- Re: Common operational misconceptions Mark Andrews (Feb 16)
- Re: Common operational misconceptions Phil Regnauld (Feb 16)
- Re: Common operational misconceptions Mark Andrews (Feb 16)
- Re: Common operational misconceptions Phil Regnauld (Feb 16)
- Re: Common operational misconceptions Mark Andrews (Feb 16)