.ORG problems this evening

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1

> BGP has no way to know that an internal network problem occurred. If
> someone mistakenly tripped over a network cable that disconnected DNS
> clusters from a router, how would the router know to drop anycast
> advertisements?
>
> (Sure, you could run zebra on the cluster. But what about if the name
> server SEGVs? There's a lot of possible scenarios....)

ALmost there.. just make sure your zebra IGPs are redistributing to your BGP so
that a failure such as that knocks out the bgp too

Steve

  Sorry no zebra. Perhaps I should run my TLDs
  DNS service on my Juniper Routers. some expect/cron
  work should provide the needed glue...

  Now if I could just get cisco to add authoritative
  DNS service to IOS, right up there with the HTTP, firewall,
  content caching, and load-balancing cruft they have
  added to their basic routing code... I could use
  cisco too! (may still need some glue tho)

  In case it was not clear, I think that multi-tasking
  hardware might be the wrong choice. I want my routers
  to route and not do apps work. For apps, I want them
  to be single-app specific. DNS service on its own hardware,
  NTP on its platform, HTTP outsourced to (vendor), etc.

  This has impact on the design of anycast solutions.
  Ultra has one model, ISC has another, and PCH uses
  a third. The more generic content crowd has its favorites.
  Then there are the "load-balancing" vendors who
  cater to these folks. One size does not fit all.

--bill

2

Date: Thu, 18 Sep 2003 11:00:53 -0700 (PDT)
From: bmanning

  Sorry no zebra. Perhaps I should run my TLDs
  DNS service on my Juniper Routers. some expect/cron
  work should provide the needed glue...

Bill, I know you know better, so let's try more facts and less
FUD. Mmmmkay? Your above paragraph is a red herring that is
analogous to saying "all multihomed services must be run on the
router itself".

Here's the deal: DNS server runs a BGP/OSPF/whatever speaker.
It says when the service IP address is up and when it's down.
For all your <whatever brand> router cares, it's talking to just
another router. If the "router" (DNS server) ain't saying "send
me traffic", the router doesn't send it traffic. Very simple.

You won't find a turnkey RPM to do it, but that doesn't mean it's
impossible. In fact, if you slow down and read previous posts,
you'll note some very big hints re how to build such a working
system. If you're limited to installing out-of-the-box packages,
you _will_ have a huge mess... but that's not my problem.

  This has impact on the design of anycast solutions.
  Ultra has one model, ISC has another, and PCH uses
  a third. The more generic content crowd has its favorites.
  Then there are the "load-balancing" vendors who
  cater to these folks. One size does not fit all.

Okay, I'll give you credit for that paragraph.

Eddy