ISP inbound failover without BGP

Tue Mar 4 04:02:41 UTC 2014

That's a good point Ray - thank you.

>________________________________
> From: Ray <sixsigma44 at hotmail.com>
>To: Matthew Crocker <matthew at corp.crocker.com>; Eric A Louie <elouie at yahoo.com> 
>Cc: NANOG <nanog at nanog.org> 
>Sent: Monday, March 3, 2014 6:31 PM
>Subject: RE: ISP inbound failover without BGP
> 
>
>
> 
>Depending on their business, using dynamic DNS providers could be a really bad idea. If they deal only with home users who won't even know, it'll probably work. If their customers are security-aware businesses, they probably block all sites hosted with dynamic DNS systems.
>
>Ray
>
>
>> Subject: Re: ISP inbound failover without BGP
>> From: matthew at corp.crocker.com
>> Date: Mon, 3 Mar 2014 20:50:26 -0500
>> To: elouie at yahoo.com
>> CC: nanog at nanog.org
>> 
>> 
>> 
>> Depends on the application, 
>> 
>> SIP, VPN, SMTP, etc just setup both IPs and let the end-user application figure it out (SIP-UA register to both IPs for example)
>> 
>> HTTP/HTTPS setup a proxy server in a colo that is multi-homed to frontend the requests. Then it can load balance traffic over both IPs.
>> 
>> DNS TTL ‘tricks’ are just that, they work ‘kinda’
>> 
>> Fatpipe?   Crazy expensive IMHO but I hear they work ok.
>> 
>> -Matt
>> 
>> --
>> Matthew S. Crocker
>> President
>> Crocker Communications, Inc.
>> PO BOX 710
>> Greenfield, MA 01302-0710
>> 
>> E: matthew at crocker.com
>> P: (413) 746-2760
>> F: (413) 746-3704
>> W: http://www.crocker.com
>> 
>> 
>> 
>> On Mar 3, 2014, at 8:11 PM, Eric A Louie <elouie at yahoo.com> wrote:
>> 
>> > This may sound like dumb question, but... I'm used to asking those.
>> > 
>> > Here's the scenario
>> > 
>> > Another ISP, say AT&T, is the primary ISP for a customer.
>> > 
>> > Customer has publicly accessible servers in their office, using the AT&T address space.
>> > 
>> > I am the customer's secondary ISP.
>> > 
>> > Now, if AT&T link fails, I can provide the customer outbound Internet access fairly easily.  So they can surf and get to the Internet.
>> > 
>> > What about the publicly accessible servers that have AT&T addresses, though?
>> > 
>> > One thought I had was having them use Dynamic DNS service. 
>> > 
>> > Are there any other solutions, short of using BGP multihoming and having them try to get their own ASN and IPv4 /24 block?
>> > 
>> > 
>> > It looks like a few router manufacturers 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.
>> > 
>> 
>> 
>
>
>