[ale] DirecTV DSL - No Reverse DNS

[Jerry Z. Yu]

	reverse DNS lookup (IP -> DNS name) has nothing to do with RARP
(which is mac->IP)
	If the ftp server (or any server for the matter) trying to do
reverse DNS lookup before allowing further client connection, valid
request whose source IP can't be resolved to a valid DNS name, the server
time out the lookup eventually and allow the client to continue anyway.
However, your client program may time out before that. Another thing would
be the ident lookup.

On Mon, 28 Jan 2002, John Mills wrote:

#ALErs -
#
#I signed up with Telocity when NorthPoint stuck it's legs up in the air, a
#bit less than a year ago. (Seems like ages!) From the first, I found that
#Telocity did not support reverse-address resolution (RAPR?). Indeed I was
#(and am) unable to access certain servers including GA Tech's
#'ftp-linux', which is sometimes frustrating. It is nothing new, and
#applies to my pre-DirecTV account.
#
#I do run a minimal server (ssh only) from my Telocity DSL account. I don't
#have a domain name directed at my IP, but expect to do so. I am interested
#in why the absence of RARP support should prevent my running a server as
#one writer suggested, or prevent its being accessed against a legitimately
#resolved domain name.
#
#On Sun, 27 Jan 2002, Paul D. Manno wrote:
#
#> On Sat, 26 Jan 2002, Ben Alexander wrote:
#
#> > I am a DirecTV DSL customer and noticed that there was no reverse DNS
#> > associated with my IP.  I contacted Customer Support and they stated:
#> > "At this time we are not offering reverse DNS mapping to IP addresses."
#> > Isn't it usually a common practice for ISPs to have reverse DNS
#> > associated with IP addresses?  I know some FTP servers will not let you
#> > connect if they cannot do a reverse lookup.  Anyone else think that this
#> > is strange?
#
#> I checked my connection about a minute ago and the Telocity/DirectTV DSL
#> connection has a valid DNS reverse map just as it always has.  Unless a
#> major change in their policy has just transpired, they've been one of the
#> few companies that support Linux and don't mind if you run servers on your
#> connection.  They don't provide you assistance for your services including
#> reverse DNS for NAT, VPN, etc. addresses.
#
#> I can't help but wonder if there's a confusion here...
#
#It looks as though there is [some confusion].
#
#Thanks for any comments
# - John Mills
#
#
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Jerry Z. Yu					+1-404-262-8544 (O)
Systems Engineer				z.yu at ptek.com
IS Support, Voicecom,				www.voicecom.com
A business unit of PTEK Holdings, Inc.		www.ptek.com


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