nanog mailing list archives
Re: Shim6, was: Re: filtering /48 is going to be necessary
From: Valdis.Kletnieks () vt edu
Date: Thu, 15 Mar 2012 15:03:02 -0400
On Thu, 15 Mar 2012 21:52:54 +0900, Masataka Ohta said:
Get real. Even EAPS takes 0.05 seconds to recover from an unexpected link failureIf you keep two or more links, keep them alive, and let them know their IP addresses each other, which can be coordinated by mobile hosts as the ends, links can cooperate to avoid broken links for a lot faster recovery than 0.05s.
May work for detecting a dead access point in a wireless mesh, but it doesn't scale to WAN sized connections. Standard systems control theory tells us that you can't control a system in less than 2*RTT across the network. There's *plenty* of network paths where endpoint-homebase-endpoint will be over 50ms. Consider the case where one endpoint is in Austria, the other is in Boston, and the node handling the mobility is in Japan. Now a router fails in Seattle. How long will it take for the endpoints to notice? (Alternatively, explain how you locate a suitable home base node closer than Japan. Remember in your explanation to consider that you may not have a business relationship with the carrier that would be an optimum location)
Attachment:
_bin
Description:
Current thread:
- Re: Shim6, was: Re: filtering /48 is going to be necessary, (continued)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Valdis . Kletnieks (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Jimmy Hess (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Valdis . Kletnieks (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary William Herrin (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary William Herrin (Mar 16)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 16)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Valdis . Kletnieks (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 15)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Geoff Huston (Mar 12)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Leo Bicknell (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary William Herrin (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Owen DeLong (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Randy Bush (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Geoff Huston (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Randy Bush (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Leo Bicknell (Mar 13)
- Re: Shim6, was: Re: filtering /48 is going to be necessary Masataka Ohta (Mar 14)