🚀 go-pugleaf

In article <Bx9F6x.EK8@comp.vuw.ac.nz> Andy.Linton@comp.vuw.ac.nz (Andy Linton) writes:
>
>In article <1992Nov5.024040.13063@kirk.bu.oz.au>, bambi@bu.oz.au (David J. Hughes) writes:
>|> C.V.Copas@lut.ac.uk writes:
>|> 
>|> >Well it doesn't SEEM to be a FAQ, so here goes. I wish to get mail to an
>|> >Australian machine
>|> >which I can verify is on the Internet by using <nslookup>. However, all my mail
>|> >vanishes into oblivion without any feedback to myself. Nor am I able to <ping>
>|> >the machine. Therefore, I have reasoned that I need to supply a routing node
>|> >specification, yes? Question: do any tools exist for determining that node? 
>|> 
>|> 
>|> You can use nslookup to find the MX relay host for your target.  Many
>|> hosts down here are in the DNS but don't actually connect to the net
>|> (ie. similar to usage of UUCP in the State etc.).
>|> 
>|> If you can't get it through the MX gateway, you can always drop the
>|> postmaster on that host a line to find out why.
>
>I mailed Conn about this and it transpires that he and I can telnet to port 25 on
>the machine but not ping it. There is no MX for the host concerned but there
>is an MX for dsto.gov.au which points to fang.dsto.gov.au first and then to
>yoyo.aarnet.edu.au
>
>e.g.
>
>$ telnet csd0.dsto.gov.au 25
>Trying 131.185.10.4...
>Connected to csd0.dsto.gov.au.
>Escape character is '^]'.
>220 CSD0.DSTO.GOV.AU TGV/MultiNet SMTP service ready.
>helo bats.comp.vuw.ac.nz
>250 CSD0.DSTO.GOV.AU ; Hello bats.comp.vuw.ac.nz, pleased to meet you.
>vrfy postmaster 
>250 CSD Postmaster <postmaster>
>quit
>221 CSD0.DSTO.GOV.AU TGV/MultiNet SMTP service complete.
>Connection closed by foreign host.
>
>But if you 'ping' it you get:
>
>$ ping csd0.dsto.gov.au.
>ICMP Host Unreachable from gateway dsto.gw.au (139.130.176.2)
> for icmp from bats.comp.vuw.ac.nz (130.195.8.13) to csd0.dsto.gov.au (131.185.10.4)
>
>I suspect it's some sort of security measure in the router but it's a little
>strange.

Not all that strange. DSTO is Defence Science and Technology Organization.
I would expect them to prevent any unknow traffic from crossing their
routers.

Mark.