I read the document with the following URL of...
http://cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094aad.shtml
And the following reads...
"IP addresses in the pool of global addresses specified with the global command require reverse DNS entries to ensure that all external network addresses are accessible through the PIX. To create reverse DNS mappings, use a DNS Pointer (PTR) record in the address-to-name mapping file for each global address. Without the PTR entries, sites can experience slow or intermittent Internet connectivity and FTP requests fail consistently.
For example, if a global IP address is 175.1.1.3 and the domain name for the PIX firewall is pix.caguana.com, the PTR record would be:
3.1.1.175.in-addr.arpa. IN PTR
pix3.caguana.com
4.1.1.175.in-addr.arpa. IN PTR
pix4.caguana.com & so on."
I assume they are talking about creating a reverse lookup with whomever hosts our external DNS?
Do anyone think this creates a security risk putting a PTR record out on the public internet? Just looking for a securiy expert opinion.
Thanks
Paul
