[c-nsp] DS1 provisioning using IP Unnumbered vs /30s

[Alex Balashov]

Alex Balashov wrote:
> Gert Doering wrote:
>> Hi,
>>
>> On Thu, Feb 05, 2009 at 08:48:35PM -0500, Alex Balashov wrote:
>>> There is no reason why you need to "waste" IP address on the /30s - 
>>> who said they have to be public IPs?  Just carve out some address 
>>> space out of a 10.0.0.0/8 range and use private transport IPs.  
>>
>> RFC1918 (indirectly) says that this is not permitted.
>>
>> (If you do this, ICMPs sourced by the remote router will send their
>> packets with an RFC1918 source address, which is strictly not allowed.
>> If you filter those packets, you'll break traceroute and PMTUd).
> 
> I find that to be OK.  :)
> 

But yeah, it's a little nasty in some cases for that exact reason.  It's 
a much better idea to do a single IP and a /32 route on Loopback.

-- 
Alex Balashov
Evariste Systems
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