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Home >> Browse Vulnerability Assessment Database >> General >> DNS Server on UDP and TCP


Vulnerability Assessment Details

DNS Server on UDP and TCP

Vulnerability Assessment Summary
Checks if the remote DNS servers answers on TCP too

Detailed Explanation for this Vulnerability Assessment

A DNS server is running on this port but it only
answers to UDP requests.
This means that TCP requests are blocked by a firewall.

This configuration is not RFC-compliant. Contrary to
common belief, TCP transport is not restricted to zone
transfers (AXFR) :
- answers bigger than 512 bytes are always transmitted
over TCP.
- for all other requests, UDP is only 'preferred' for
performance reasons. i.e. RFC1035 (STD0013) does not forbid
a DNS client from issuing its queries directly over TCP.

** If you are sure that your DNS server will never return
** answers bigger than 512 bytes and that the client
** software prefers UDP (which is nearly certain), you may
** disregard this message.

Read RFC1035 (STD0013) for more information.

Network Security Threat Level: None

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Michel Arboi

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