nanog mailing list archives
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
From: Randy Carpenter <rcarpen () network1 net>
Date: Tue, 25 Jan 2011 16:43:32 -0500 (EST)
----- Original Message -----
On Tue, 25 Jan 2011 13:42:29 -0500, Owen DeLong <owen () delong com> wrote:Seriously? Repetitively sweeping a /64? Let's do the math...... We've had this discussion before... If the site is using SLAAC, then that 64bit target is effectively 48bits. And I can make a reasonable guess at 24 of those bits. (esp. if I've seen the address of even one of the machines.)
I wouldn't say you could assume that because one machine is a particular manufacturer, that they are all the same. I would say you could certainly limit a scan to a set list of well-known 24-bit IDs (say ~100 or so?), that would still take a couple days at least to scan. Could there not be something implemented in the firewall to prevent an incoming scan causing an issue with ND ? If you block all incoming by default, why would the router try to do a ND on an address that is not allowed? -Randy
Current thread:
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN, (continued)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Douglas Otis (Jan 26)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 26)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Michael Loftis (Jan 24)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Patrick Sumby (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Roland Dobbins (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Owen DeLong (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Ricky Beam (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Randy Carpenter (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Smith (Jan 25)