[169562] in North American Network Operators' Group
Re: ISP inbound failover without BGP
daemon@ATHENA.MIT.EDU (Eric A Louie)
Mon Mar 3 23:49:46 2014
Date: Mon, 3 Mar 2014 20:49:21 -0800 (PST)
From: Eric A Louie <elouie@yahoo.com>
To: Randy Carpenter <rcarpen@network1.net>
In-Reply-To: <1473335835.293638.1393903242317.JavaMail.zimbra@network1.net>
Cc: NANOG <nanog@nanog.org>
Reply-To: Eric A Louie <elouie@yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Honestly?=A0 Because the end-customers are not technically competent enough=
to run dual-homed BGP, and we don't want to be their managed service provi=
ders on the IT side.=A0 And announcing the AT&T space is fine until somethi=
ng goes wrong, and I have to troubleshoot the problem (Customer - "How come=
AT&T is down, and we're not getting inbound traffic to our servers?", and =
I discover L3 or CenturyLink isn't accepting my advertisement for some weir=
d reason, but they won't fess up to it for a few frustrating hours)=0A=0A=
=0A=0A=0A=0A>________________________________=0A> From: Randy Carpenter <rc=
arpen@network1.net>=0A>To: Eric A Louie <elouie@yahoo.com> =0A>Cc: NANOG <n=
anog@nanog.org> =0A>Sent: Monday, March 3, 2014 7:20 PM=0A>Subject: Re: ISP=
inbound failover without BGP=0A> =0A>=0A>=0A>Is there some technical reaso=
n that BGP is not an option? You could allow them to announce their AT&T sp=
ace via you as a secondary.=0A>=0A>-Randy=0A>=0A>----- Original Message ---=
--=0A>> This may sound like dumb question, but... I'm used to asking those.=
=0A>> =0A>> Here's the scenario=0A>> =0A>> Another ISP, say AT&T, is the pr=
imary ISP for a customer.=0A>> =0A>> Customer has publicly accessible serve=
rs in their office, using the AT&T=0A>> address space.=0A>> =0A>> I am the =
customer's secondary ISP.=0A>> =0A>> Now, if AT&T link fails, I can provide=
the customer outbound Internet access=0A>> fairly easily.=A0 So they can s=
urf and get to the Internet.=0A>> =0A>> What about the publicly accessible =
servers that have AT&T addresses, though?=0A>> =0A>> One thought I had was =
having them use Dynamic DNS service.=0A>> =0A>> Are there any other solutio=
ns, short of using BGP multihoming and having them=0A>> try to get their ow=
n ASN and IPv4 /24 block?=0A>> =0A>> =0A>> It looks like a few router manuf=
acturers have devices that might work, but it=0A>> looks like a short DNS T=
TL (or Dynamic DNS) needs to be set so when the=0A>> primary ISP fails, the=
secondary ISP address is advertised.=0A>> =0A>> =0A>=0A>=0A>
