[conspire] Migration plan for moving IP addresses

[Bill Moseley]

Sorry if I was too verbose on this to get a response.  This move
isn't far off for me, so looking for a little guidance, if anyone can
help.  Thanks.

Basically, I'm asking if I can use two different /29 subnets on the
same switch to the same server and not end up with asymmetric routing.

Or really, how best to manage IP changes.

Here's the original text:

On Mon, Aug 18, 2008 at 09:23:04AM -0700, Bill Moseley wrote:
> At my home office I have DSL with a /29.  The speed is horrible and
> I'm looking at moving to a business account with Comcast Cable.  Yes,
> scares me a bit.
> 
> My current setup is a /29 that comes into a switch and then to a
> number of machines (with public IP addresses).  (Then NAT from a few
> of those machines to inside LANs).  My switch is not managed -- just
> an inexpensive small business grade switch -- and does not have any
> kind of filtering.
> 
> My question is how to manage the change in IP numbers smoothly.
> 
> I suspect I'll want my servers to respond to both the old and new IPs
> for a time.
> 
> I assume I can just configure my machines to listen to both the old
> and new IP addresses during the transition.  And then just plug the
> new ethernet cable right into my existing switch along with the
> existing DSL ethernet.
> 
> What I'm not clear on is if I need to alter my routing tables, or if
> my switch will deal with this.  I suspect I want to avoid asymmetric
> routing (and I also suspect the two ISPs won't pass my packets with a
> different source IP).
> 
> Anyone have experience with this?  Is this something where I'd need to
> use iproute (v2)?
> 
> Frankly, I can afford a few hours of downtime -- so yanking the DSL,
> and reconfiguring with the new IP addresses would not be horrible, but
> IIRC, the TTL for the root name servers is a day, so there could be
> significant time where queries (and cached dsn) are trying to get to
> the old IPs.
> 
> Anyone been through this?  Still have your migration plans around?
> 
> Thanks,
> 
> -- 
> Bill Moseley
> moseley at hank.org
> Sent from my iMutt
> 
> 
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-- 
Bill Moseley
moseley at hank.org
Sent from my iMutt