Hi,

> ac.d4a.net is being announced in the DNS as 203.164.92.195. Is that
> correct?
> I can't get a connection to port 25 on that machine -- something is

With tcpdump running and telnetting to port 25 of that address I see:

12:37:54.262380 ubr1-pos1-0.mirnd1.nsw.optushome.com.au > dog.eschle.com: icmp: host 
co3018450-a.mirnd1.nsw.optushome.com.au unreachable - admin prohibited filter 
Offending pkt: [|tcp] (DF) (ttl 42,
id 61644) (ttl 231, id 521)

and according to tracroute, it's the last host vefore the destination
who sends that:

21  r1-pos0-0-0.rivrw1.nsw.excitehome.net.au (203.164.3.26)  657 ms  549 ms  535 ms
22  ubr1-pos1-0.mirnd1.nsw.optushome.com.au (203.164.3.146)  550 ms  562 ms  563 ms
23  co3018450-a.mirnd1.nsw.optushome.com.au (203.164.92.195)  571 ms  580 ms  577 ms

So whoever maintains ubr1-pos1-0.mirnd1.nsw.optushome.com.au (203.164.3.146)
has probably put in some filtering there during the last few days.

                                claudio
-- 
Claudio Nieder, Kanalweg 1, CH-8610 Uster, Tel +41 79 357 6743
yahoo messenger: claudionieder aim: claudionieder icq:42315212
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