problem with reverse lookup of private IP
phn at icke-reklam.ipsec.nu
phn at icke-reklam.ipsec.nu
Sat Mar 9 09:49:08 UTC 2002
Sally Wong <sywong10 at yahoo.com> wrote:
> Hi,
> we have had problem to ftp or to telnet from PC that uses a private
> IP. We use to have this problem intermittently, and this consistently
> happens to the PC with a private IP. There is no problem when coming
> from a public IP. Our DNS server crashed last week, ever since it
> came back on, we have heard a lot more of such kind of problem.
> However, sometimes if we added the private IP address into the
> /etc/hosts file, this problem would go away. Looks to me this is a
> reverse lookup kind of problem. Do anybody out there know of such a
> case?
The private (aka rfc1918 ) addresses is not resolved on internet, thus
they will "time out" before a nameserver gives up. This takes time,
and this is what you observe as delays.
To prevent this you should create a "reverse zone" for all the 1918 addresses
you expect to happen, and make shure that any query for "PTR" will reach
a servers that at least has the zone.
Typically this will be done in your "outermost" nameservers.
> many thanks
> Sally
> does anybody know if any strange things happen when rfc1918 is in the
> picture?
--
Peter Håkanson
IPSec Sverige (At the Riverside of Gothenburg, home of Volvo)
Sorry about my e-mail address, but i'm trying to keep spam out.
Remove "icke-reklam" and it works.
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