BIND behind Cisco 827 router

[Marc.Thach at radianz.com]

Hi Ya,

There is one individual (search the archives for Micheal Pelletier) who has
asserted on more than one occasion that Cisco's NAT DNS ALG has a bug.  He
claims that he has an outstanding problem ticket  with Cisco but has so far
failed to provide more details of the exact nature of the bug, the IOS
version or the Cisco TAC ticket or bug ID.  My own understanding is that
for recent IOS versions there are no problems and that the DNS ALG works as
specified.
I am still prepared to be corrected on this if Micheal wishes to do so.

What is the application that displays the error message?
Where is the application server?
If this gets complicated, then you may need to sniff the wire using MS
Network Monitor or if you haven't got that then a package called Ethereal
will do nicely on Win 2k.

rgds
Marc TXK
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                    Ya Wen                                                                                          
                    <ya4wen at yahoo.c        To:     bind-users at isc.org                                               
                    om>                    cc:                                                                      
                    Sent by:               Subject:     BIND behind Cisco 827 router                                
                    bind-users-boun                                                                                 
                    ce at isc.org                                                                                      
                                                                                                                    
                                                                                                                    
                    21/08/2001                                                                                      
                    02:51                                                                                           
                                                                                                                    
                                                                                                                    





Hi, everyone:

I just set up a BIND 8.2.4 server on my W2K server.
This server is given a private IP address but is
staticlly mapped into a public IP address by a Cisco
827 ADSL router. This server is acting as the primary
DNS server for my .com domain. Now I can resolve
everything from internal hosts to outside hosts, but
external hosts could not resolve anything on my
domain, always get a "server no response" error. I
checked the archive and understood that there is some
issues about the ALG(Application Level Gateway) on
Cisco router IOS. But I did not find any good solution
about this issue. I do not want to have my ISP to host
my DNS server and I really want to use private IP
address for this server (I know if I readdress this
server to use the public IP, I will solve the
problem). Anybody have any fix for this or at least
some pointer I can use?

Thanks very much!

-Ya

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