[169551] in North American Network Operators' Group
ISP inbound failover without BGP
daemon@ATHENA.MIT.EDU (Eric A Louie)
Mon Mar 3 20:11:34 2014
Date: Mon, 3 Mar 2014 17:11:07 -0800 (PST)
From: Eric A Louie <elouie@yahoo.com>
To: NANOG <nanog@nanog.org>
Reply-To: Eric A Louie <elouie@yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
This may sound like dumb question, but... I'm used to asking those.=0A=0AHe=
re's the scenario=0A=0AAnother ISP, say AT&T, is the primary ISP for a cust=
omer.=0A=0ACustomer has publicly accessible servers in their office, using =
the AT&T address space.=0A=0AI am the customer's secondary ISP.=0A=0ANow, i=
f AT&T link fails, I can provide the customer outbound Internet access fair=
ly easily.=A0 So they can surf and get to the Internet.=0A=0AWhat about the=
publicly accessible servers that have AT&T addresses, though?=0A=0AOne tho=
ught I had was having them use Dynamic DNS service.=A0 =0A=0AAre there any =
other solutions, short of using BGP multihoming and having them try to get =
their own ASN and IPv4 /24 block?=0A=0A=0AIt looks like a few router manufa=
cturers have devices that might work, but it looks like a short DNS TTL (or=
Dynamic DNS) needs to be set so when the primary ISP fails, the secondary =
ISP address is advertised.
