[20488] in North American Network Operators' Group
Re: Maybe I'm misreading this but...
daemon@ATHENA.MIT.EDU (I Am Not An Isp)
Wed Oct 14 17:58:38 1998
Date: Wed, 14 Oct 1998 14:37:18 -0700
To: Barry Shein <bzs@world.std.com>, nanog@merit.edu
From: I Am Not An Isp <patrick@ianai.net>
In-Reply-To: <199810142111.AA19795@world.std.com>
At 05:11 PM 10/14/98 -0400, Barry Shein wrote:
>
>The following traceroute seems to indicate, according to ARIN, that
>someone is running routers for spammers in the IANA Reserved netspace?
[SNIP]
>> 8 bs-jackson-gw.customer.alter.net (157.130.65.226) 107 ms 132 ms 96 ms
>> 9 172.17.80.46 (172.17.80.46) 59 ms 53 ms 44 ms
>>10 172.21.210.18 (172.21.210.18) 122 ms 96 ms 49 ms
>>11 209.149.111.17 (209.149.111.17) 53 ms (ttl=118!) 58 ms (ttl=118!)
150 ms (ttl=118!)
>What's going on here?
Barry, 172.16.0.0/12 is part of RFC1918 space. There is no prohibition of
addressing routers with these addresses, and in fact I do not know of a
router that will route RFC1918 space differently than any other IP address.
(Of course, you can put in filters, and many people do, but you can filter
any addresses exactly the same way.) This is a perfectly legitimate use of
RFC1918 space, as long as those hosts expect no connectivity outside their
own network. Many people use RFC1918 on WAN links and whatnot to preserve
their ARIN allocations for "real" hosts. Read the RFC for more info.
> -Barry Shein
TTFN,
patrick
I Am Not An Isp
www.ianai.net
"Think of it as evolution in action." - Niven & Pournelle
