RE: ftp long time connection

I think that the DNS configuration will affect ftp connections, even if the client is trying to FTP to the IP address of the server.

What they're talking about is the reverse DNS lookup, where the SERVER does a reverse lookup on the address of the CLIENT to see who's trying to connect, for logging and authentication purposes. If the Server doesn't know the name associated with the Client IP address, it will take some extra time before the server gives up and simply logs the client IP address instead of hostname.

Make sure that the client system is listed in DNS, that the server is using the appropriate DNS server, or that the server has a HOSTS file listing the client. From the server, try doing an nslookup against the client IP address and see if it correctly returns the client name.

Jason Walker
Lockheed Martin CSOC
(281) 218-2569

-----Original Message-----
From: Ben McGinnes [mailto:ben-mcginnes@iname.com] Sent: Wednesday, February 20, 2002 8:39 AM To: selinux@tycho.nsa.gov
Cc: Flood Randy Capt AFCA/TCAA; Lonnie Cumberland Subject: Re: ftp long time connection

Flood Randy Capt AFCA/TCAA(randy.flood@scott.af.mil)@Tue, Feb 19, 2002 at 01:55:17PM -0600:
>
> Do you have reverse DNS entries for your server and client and is DNS
> configured correctly?
>
> If DNS is not set up properly you can get results like that.

True, DNS errors will do that, as others here have pointed out. The original query, however, also mentioned that accessing the host directly by its IP was attempted with the same results. So while there may be some DNS-related delays as well, it cannot be a complete explanation. I also doubt SE Linux is the cause here either since it's a fairly generic kind of problem.

I'd try attempting other protocols such as SSH, telnet (if enabled), SMTP and probably SCP too. To both hostname and IP address. See if it is affecting all protocols or just one or two, also try telnetting to the machine on port 21 and see exactly what point at which it slows to a crawl or breaks.

Chances are the cause (and shortly thereafter, the solution) will leap out during this process.

Regards,
Ben

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