PIX and internal DNS Server

rgonzaga — Fri, 21 Feb 2020 07:36:30 GMT

I currently have two internal Win2K3 DNS servers on my internal network that had been working fine. I tried to upgrade my PIX os from 5.1.2 to 6.3.x but that stopped all traffic. I downgraded to 5.2.9 which allowed at least email to flow in again. The problem is that my internal DNS servers now cannot resolve requests from the outside. If I put in the IP of my IPS' DNS servers on the client, it works. The config has not changed but still does not work. Please help this rookie.

Re: PIX and internal DNS Server

piseli — Fri, 03 Sep 2004 15:29:59 GMT

This should be fixed with 6.3.3 and higher be sure that you have the:

" fixup protocol dns maximum-length 512 "

If this does not works try:

Workarround two use the alias command:

See:http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094aee.shtml

alias (inside) 10.10.10.10 99.99.99.99 255.255.255.255

!--- This command sets up DNS Doctoring. It is initiated from the clients in

!--- the "inside" network. It watches for DNS replies that contain

!--- 99.99.99.99, then replaces the 99.99.99.99 address with the 10.10.10.10

!--- address in the "DNS reply" sent to the client PC.

sincerly

Patrick

topic PIX and internal DNS Server in Network Security

PIX and internal DNS Server

Re: PIX and internal DNS Server