can not resolve few sites

[Stephane Bortzmeyer]

[Send to the list, not to me, i'm not doing private consultancy!]

On Tue, Nov 30, 2004 at 03:20:23PM +0530,
 Rakesh Man Karmacharya <rakeshman at mos.com.np> wrote 
 a message of 53 lines which said:

> $ dig +trace gmx.de ns

No, no, no, I said "dig +trace www.gmx.de".

> gmx.de.                 86400   IN      NS      dns.gmx.net.
> gmx.de.                 86400   IN      NS      ns.schlund.de.
> ;; Received 74 bytes from 193.171.255.34#53(E.NIC.de) in 892 ms

Until now, everything is OK.
 
> ;; reply from unexpected source: 202.52.255.47#53, expected 213.165.64.1#53
> ;; Warning: ID mismatch: expected ID 24755, got 50944
> ;; reply from unexpected source: 202.52.255.47#53, expected 213.165.64.1#53
> ;; Warning: ID mismatch: expected ID 24755, got 50944
> ;; connection timed out; no servers could be reached

That was funny. 202.52.255.47 is one of your own machines. Isn't there
some sort of transparent proxy on the way to gmx.de name servers? But
the ID is not the same so it may be a coincidence. Is it reproducible?
What happends when you resolve other names in Germany like knipp.de?