Seeking clue @ Cbeyond / ASN17184 and/or other suggestions
mike at rockynet.com
Fri Jun 20 13:07:01 CDT 2008
We're having some difficulties getting a lame DNS delegation and old
email hosting configuration removed from Cbeyond's servers. According to
their front line tech support "We cannot work on something we do not
host no more".
Jared's NOC list doesn't have anything on them, nor do they appear to
participate in INOC-DBA. Additional attempts to resolve this are noted
The specific issues are:
1) lame authority on prosourcedenver.com:
$ dig +short ns prosourcedenver.com @beyond.cbeyond.net.
$ dig +short ns prosourcedenver.com @c.gtld-servers.net
Front line tech support indicated this is a Registrar problem, and they
would open up a ticket with Tucows to get it resolved :(
I also tried sending an email to the address in the SOA:
$ dig +short soa prosourcedenver.com @beyond.cbeyond.net.
prosourcedenver.com. hostmaster.cbeyond.com. 2004042100 86400 1800
Unfortunately, that address is invalid :(
<hostmaster at cbeyond.com>: host mx2.cbeyond.net[18.104.22.168] said: 550
Address rejected hostmaster at cbeyond.com (in reply to RCPT TO command)
2) The invalid MX records that Cbeyond is serving resolve to hosts that
apparently believe they are authoritative for the prosourcedenver.com
domain, and are in effect creating an email blackhole:
$ dig +short mx prosourcedenver.com @to.cbeyond.net.
$ telnet mail.west.cbeyond.com smtp
Connected to mail.west.cbeyond.com (22.214.171.124).
Escape character is '^]'.
220 mail.east.cbeyond.com ESMTP
250-AUTH PLAIN LOGIN
250 AUTH=PLAIN LOGIN
250 sender <> ok
rcpt to:<MUNGED at prosourcedenver.com>
250 recipient <MUNGED at prosourcedenver.com> ok
rcpt to:<anyone at anywhere.com>
550 #5.1.0 Address rejected anyone at anywhere.com
Connection closed by foreign host.
Email to postmaster at cbeyond.com hasn't resolved the issue either :( All
of the above commands have been sent to their tech support address in an
attempt to convince them that the problem is with their servers, but
they refuse to accept this.
Finally, as an additional note, the whois delegation for their ASN seems
to be broken:
$ whois -h whois.arin.net 17184
[Redirected to rwhois.cbeyond.net:4321]
%rwhois V-1.5:003eff:00 rwhois.cbeyond.net (by Network Solutions, Inc.
%error 230 No Objects Found
I'm at a loss of how to proceed now, except to tell people who are
suffering from the email blackhole to find another ISP. Does anyone else
have any contacts with a clue, or semblance of clue, at Cbeyond? Does
anyone have any better ideas for me, short of this lame attempt at
I won't even get into the issue of what a PITA it is to port DIDs from
More information about the NANOG