[conspire] Migration plan for moving IP addresses
moseley at hank.org
Tue Sep 2 16:03:45 PDT 2008
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
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?
> Bill Moseley
> moseley at hank.org
> Sent from my iMutt
> conspire mailing list
> conspire at linuxmafia.com
moseley at hank.org
Sent from my iMutt
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