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Re: IP aliasing
On Wed, 18 Jun 2008 16:57:01 +0100
Patrick Welche <prlw1%cam.ac.uk@localhost> wrote:
> On Wed, Jun 18, 2008 at 10:00:10AM -0400, DAve wrote:
> > Good morning,
> > I have been told by my Network Administrator that we will be
> > changing IP blocks for several key services very soon. I have three
> > new DNS servers running NetBSD on the new IP block already. I also
> > have two legacy DNS servers (also on NetBSD) that I need to drag
> > along behind me for a few more months.
> > My new IP block is 65.124.104.X and my old IP block is
> > 65.196.224.X. Is it possible to have a single machine answer for
> > both IPs on a single interface? The network Gods claim they can
> > route the traffic to me no problem, but I am unsure how to
> > configure the alias for the interface.
> > Old address: 126.96.36.199
> > Netmask: 255.255.255.0
> > Gateway: 188.8.131.52
> > New address: 184.108.40.206
> > Netmask: 255.255.255.224
> > Gateway: 220.127.116.11
> > Is it even possible to alias the old address with the new gateway?
> ifconfig if0 inet 18.104.22.168 netmask 255.255.255.224
> ifconfig if0 inet 22.214.171.124 netmask 255.255.255.0 alias
> should do the trick? (replacing if0 with bge0 wm0 nfe0 or whatever
> you have)
> Your gateway is a specific router, so what is its ip number?
> route change default 126.96.36.199
> for the outbound traffic?
Right, but that can't coexist with the old setting; you can only have
one default route, I believe.
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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