Reverse DNS and Web-browsing

[Peter Dambier]

M wrote:
> Can slow reverse DNS cause web browsing to run slow?  Do http servers do a
> reverse DNS on all connections and wait for a response before serving up the
> page?
> 
> How can I tell if my reverse DNS is slow or sporatic?
> 
> Matt
> 

You can tell Appache not to log hostnames but instead stay with ip-addresses.
Then Appache will be faster.

    dig -x 123.056.089.047

will reverse lookup 123.056.089.047 and tell you the time needed.

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36697
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;47.89.56.123.in-addr.arpa.     IN      PTR

;; AUTHORITY SECTION:
123.in-addr.arpa.       600     IN      SOA     ns1.apnic.net. read-TXT-record-of-zone-first-dns-admin.apnic.net. 2006012001 7200 1800 604800 172800

;; Query time: 2200 msec
;; SERVER: 192.168.48.227#53(192.168.48.227)
;; WHEN: Tue Jun 13 02:12:21 2006
;; MSG SIZE  rcvd: 132


Peter

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Peter and Karin Dambier
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