Connectivity
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Tue Sep 14 13:54:20 UTC 1999
> At the risk of sounding stupid, If a firewall disables pinging will this effe
> ct
> dns.
No. That is to say they are it is blocking ICMP ECHO
request. If it blocks all ICMP messages then there is the
potential to slowdown and potentially break the DNS.
> How does dns reachout and touch , lets say a forwarder?
The same way any DNS query is made. It sends a UDP DNS
query to port 53 on the forwarder, the answer then comes
back from this port. Most firewalls don't let random UDP
traffic through. Often you need to force the queries to
be made from specific ports. With BIND 8 this is controlled
by the query-source option.
Mark
>
> Stating to feel useless 8-)
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--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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