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[aprssig] Tier 2 Routing Question

Heikki Hannikainen hessu at hes.iki.fi
Thu Oct 22 15:43:13 UTC 2009


On Thu, 22 Oct 2009, Jason KG4WSV wrote:

> On Thu, Oct 22, 2009 at 9:06 AM, Matti Aarnio <oh2mqk at sral.fi> wrote:
>
>> There was some radical APRS-IS Tier-2 netsplit at 03:00 UTC this morning.
>> About a third of global flow stopped flowing to aprs.fi.
>
> Why would aprs.fi be connected to tier 2 and not the core?

Why would it not be connected to a tier 2 server? The same stuff is 
(usually, except this morning) available there.

I'm hosting a local tier 2 server in the next rack at the same site with 
aprs.fi. That's the server aprs.fi connects to. The server used to be 
directly connected to the core servers, so there wasn't much practical 
difference whether aprs.fi connected to the local tier2 server or directly 
to the core. It does save a little downstream bandwidth (one downstream 
full feed instead of two - not that it would matter at all given the 
gigabit uplink), and a socket connection from the core servers (they've 
been on short supply at times).

It does automatically connect to the core directly in case the local 
server goes down. Also, in case the core would not be available from 
Finland, at least the data from igates in .fi does get to aprs.fi via the 
local T2 server. :)

If there are any further problems with the T2 core connectivity, I'll have 
to reconsider, of course. But I think the issue will be fixed and the 
lesson has been learned.

   - Hessu




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