Re: ftp question
On Fri, 28 Nov 1997, Nathan E Norman wrote:
> On Fri, 28 Nov 1997, Paul Tanner wrote:
>
> : Since my ISP upgraded to x2 56K I have been unable to ftp several sites
> : (including ftp.debian.org) However I can ftp , for example, prep.ai.mit.edu .
> :
> : The ISP's old 33.6 system is available, as before, using the old phone
> : number. (x2 was installed on a new phone number) After a failed attempt at
> : ftp, I can log out of my 52k connection, then log on using the old phone
> : number, and ftp the same site and, only a couple minutes later ---it works!
> : (but at 31.2 or slower) I have repeated this enough times to be convinced it
> : is not a random failure.
>
> If I were a betting man, I'd guess that the problem lies in this
> paragraph ... modems have IP addresses, so new modems are going to be
> assigned new IP addresses. Many FTP sites try to resolve the IP address
> they find within an incoming packet back to a name, for some added sense
> of security. ftp.debian.org is a site that does this. If you do not
> have a PTR record defined, you won't be able to ftp!! Likely as not,
> your provider has not gotten around to reverse name-serving their new
> modem pool, so many FTP sites are convinced you're a charlatan.
>
> You can test this if you know what your IP address is - simply do an
> nslookup on the IP address. You'll find out soon enough if it's reverse
> name-served or not.
>
> If the new modems aren't reverse name-served, feel free to complain to
> your provider. :)
>
This address didn't work:
~$nslookup
> 206.221.238.117
Name: ts4-117.keynet.net
Address: 206.221.238.117
About 5 minutes later on the 33.6 line, this one did:
~$nslookup
> 206.221.238.182
Name: ts1-182.keynet.net
Address: 206.221.238.182
Thanks for the reply
Paul Tanner
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