Maybe I'm misreading this but...

Wed Oct 14 21:37:18 UTC 1998

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
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