nanog mailing list archives
Re: Measure overall network availability
From: Nils Ketelsen <nils.ketelsen () kuehne-nagel com>
Date: Fri, 7 Jan 2005 10:43:40 -0500
On Fri, Jan 07, 2005 at 12:23:48PM +0800, Joe Shen wrote:
Hi, is there any recommended method to measure overall network availability?
The problem is, that most people have no definition when they consider their network available. And without that definition it seems impossible to monitor it. In the end it all comes down to defining service Levels which are acceptable. That might be as simple as defining how long round trip times are allowed to be (is a link packets need 16seconds to pass still available?) or as complicated as "is my network reachable from at least 99.8% of the ASes on the internet". Some things are easy to monitor, some are difficult, some are virtually impossible. Is your network still available if packets reach your webserver really fast from everywhere in the world, but the Firewall drops outgoing packets with source port 80? Technically the network is there, but practically it is unusable for many things. So availability might also be a value that is useless in real life. Nils
Current thread:
- Measure overall network availability Joe Shen (Jan 06)
- Re: Measure overall network availability Allan Liska (Jan 06)
- Re: Measure overall network availability Suresh Ramasubramanian (Jan 06)
- Re: Measure overall network availability Jim Popovitch (Jan 07)
- Re: Measure overall network availability Petri Helenius (Jan 07)
- Re: Measure overall network availability Suresh Ramasubramanian (Jan 07)
- Re: Measure overall network availability Vicky Rode (Jan 07)
- Re: Measure overall network availability Robert E . Seastrom (Jan 07)
- Re: Measure overall network availability Jim Popovitch (Jan 07)
- Re: Measure overall network availability Nils Ketelsen (Jan 07)
- Re: Measure overall network availability Stephane Bortzmeyer (Jan 07)
- Re: Measure overall network availability Gordon (Jan 07)
- Re: Measure overall network availability Michael Painter (Jan 07)