I have the same Linux installation in both machines. RedHat 6.1.
To see if I understand you correctly,
It is the tcpd of the server who does the reverse DNS, right?
Reversed DNS might be wrong at either side?
Since my host here in Malaysia generally has problems to connect over FTP
(which I assumed was a general FTP problem), can I assume that the NetAdmin
here, hasn't got it setup correctly?
Can it be tested? nslookup?
Niclas
Ray Olszewski wrote:
> It's both. The host is Sweden tries to do a reverse lookup on you when you
> telnet or ftp to it, and your DNS isn't set up to respond to a reverse
> lookup. Without knowing quite a bit about how you do DNS, I can't guess the
> details or the fix.
>
> In the other direction ... I'd guess that your host is also trying to do a
> reverse lookup, but that the host is Sweden has its DNS set up properly to
> answer a reverse-lookup request. Or it's possible, if les likely, that your
> system isn't doing a reverse-lookup check on incoming connections.
>
> Typically, both telnet and ftp are run as inetd services, and both typically
> use tcpd to screen connection attempts. It's tcpd that's making the actual
> reverse lookup request. In contrast, httpd is typically run standalone, and
> turning off reverse lookup (it's an option in Apache) is a standard way to
> speed up Web server responsiveness.
>
> At 01:06 PM 2/28/00 +0800, Niclas Hedhman wrote:
> >
> >If I from my Linux box, envision.asiaconnect.com.my, in Malaysia do
> >
> >telnet l2w204.medab.se
> >
> >to a Linux box in Sweden, the connection takes about one minute or so.
> >FTP is the same, HTTP a lot faster.
> >
> >But if I from that machine telnet or ftp back to the Malaysian host, the
> >connection is up in a second or two.
> >
> >I can only explain this by it has something to do with reversed DNS
> >resolution, and my questions are...
> >
> >a) Does it? If not, what else could it be...
> >b) And in which network, Malaysia or Sweden?
>
> ------------------------------------"Never tell me the odds!"---
> Ray Olszewski -- Han Solo
> Palo Alto, CA [EMAIL PROTECTED]
> ----------------------------------------------------------------
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