Nice one David - network topology gets funky when one starts playing with tunnels. Given the fact that the router next to me gets its public address space through an L2TP tunnel back to WIX, there's no way for you to know if latency to my network is due to a broken router, a bounce off a satellite, a network of bongo drums, or because I've decided to take my entire network on vacation to Nizhneangarsk. JB -----Original Message----- From: David Robb [mailto:ender(a)paradise.gen.nz] Sent: Tuesday, 19 July 2005 10:33 a.m. To: Barry Murphy Cc: nznog(a)list.waikato.ac.nz Subject: Re: [nznog] [OT]Ispmap / isp locations / core routers On Tue, 19 Jul 2005, Barry Murphy wrote:
The idea is to ascertain where an issue may lie. I understand the network will most likely heal its' self, however it's still nice to know where the issue lies.
I'd be careful how much value you put in real world geographical data and hence topology, vs network topology. As I think we're all aware, networks can be complicated beasties depending on which way you try and draw them.
I'm guessing customers connect directly to the erx's, thus if the erxcrash's and goes down, customer falling off that node will be effected.
Well yes, if a customer's single homed off of any device and it dies for some reason they'll lose service. But in most networks there are many more devices than just the routers, and I doubt you'll get anyone telling you their complete network layout.
The idea is a pretty map with colors indicating packet loss. Let's just see what happens when the next big network fault happens.
--David _______________________________________________ NZNOG mailing list NZNOG(a)list.waikato.ac.nz http://list.waikato.ac.nz/mailman/listinfo/nznog