two /24's and only one gateway - is routing still possible?

Michael K. Smith - Adhost mksmith at adhost.com
Tue Apr 26 16:35:10 UTC 2011


> -----Original Message-----
> From: owner-freebsd-net at freebsd.org [mailto:owner-freebsd-
> net at freebsd.org] On Behalf Of fbsdmail at dnswatch.com
> Sent: Monday, April 25, 2011 3:24 PM
> To: freebsd-net at freebsd.org
> Subject: Re: two /24's and only one gateway - is routing still possible?
> 
> 
> On Mon, April 25, 2011 12:11 pm, Julian Elischer wrote:
> > On 4/25/11 11:47 AM, fbsdmail at dnswatch.com wrote:
> >
> >> Greetings,
> >> I've been trying to figure an ideal solution to this for some time,
> >> and thought I'd post the question here to see if anyone else is working
> >> with this situation. Here's my scenario;
> >> I have a /24 with a prefix of 168.103.150.xxx with a gateway on this
> >> prefix (DSLmodem).
> >> I also have a /24 with a prefix of 75.160.109.xxx
> >> My question(s) is/are:
> >> 1) is it possible to route both of these across the same GW?
> >> 2) if answer to 1) == NO, what might I do?
> >>
> >
> > you probably need to make a routing request to your ISP to ask them to
> > advertise that  75.160.109.xxx is available via 168.103.150.x
> > they may charge you $$ to do so or may not even want to do it. They may
> > also require proof that you own them. this may be a problem as they are
> > owed by cox communications and Quest. you'd thus have to get permission
> > from each ISP to route teh other..
> 
> Hello, and thank you for your reply.
> They're actually owned by US West Communications (now Qwest), and
> CenturyTEL (now CenturyLink), which recently bought all QWest DSL
> related business.
> I lease both blocks, and have ASN's for both.
> My intention/goal is to route both blocks over the same GW (the 168)
> The only solution I could come up with was to create a FreeBSD box to
> serve as a Gateway, having it connected directly to the DSLmodem
> (external),
> and simply have it assigned both an IP out of the 168 block, as well
> as one from the 75 block. Problem is, I'll burn 2 additional addresses,
> and create an extra hop to & from the network(s). :(
> 
Why don't you get them to assign you a /30 on your DSL link and route the two /24's to you? 

Mike


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