Windows XP accepts DNS response with unexpected RR.

Created: 2005/09/13
Revised:
Published: 2005/09/20

Description

When the client sends query for AAAA RRs, some DNS server erroneously sends response of other RR type (typically A). Windows XP accepts that suspicious response.

Fixed

None

Workaround

None

Memo

This is problematic in the following scenario: 1. Web browser tries to connect web sites with AAAA and A via access gateway (w/ DNS, web interface). 2. DNS client queries for AAAA RR. 3. DNS server responds with A RR w/ address of gateway. 4. Web browser connects access gateway. 5. Returned page contains a "redirect" to access gateway, with its hostname. 6. Go to 1 (and loop infinitely).