Yes. --Dean At 01:12 PM 10/16/98 -0400, tvo wrote:

Doesn't this break MTU path discovery though?

------- John Fraizer (tvo) | __ _ The System Administrator | / / (_)__ __ ____ __ | The choice mailto:tvo@EnterZone.Net | / /__/ / _ \/ // /\ \/ / | of a GNU http://www.EnterZone.Net/ | /____/_/_//_/\_,_/ /_/\_\ | Generation A 486 is a terrible thing to waste...

On Wed, 14 Oct 1998, I Am Not An Isp wrote:

...

At 05:11 PM 10/14/98 -0400, Barry Shein wrote:

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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!)

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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.

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-Barry Shein

TTFN, patrick

I Am Not An Isp www.ianai.net "Think of it as evolution in action." - Niven & Pournelle

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