Great Circle Associates Firewalls
(March 1995)
 

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Subject: Re: DNS on firewall??
From: "J. T. Judge" <sy71703 @ public . fmr . com>
Date: Mon, 27 Feb 1995 16:25:04 -0500
To: firewalls @ greatcircle . com



	For those of you with split DNS
	( small external DNS primary for XXX.com, resolv.conf points to
	internal DNS servers who are primary for XXX.com and have 
	forwarders to the gateway to resolve external names)

	Is your firewall a network level firewall ? 
		So, joe_user @
 yy .
 XXX .
 com can 'ftp foo.com' and it 
		connects ?

	or is your firewall an application level firewall ?
		So, joe_user @
 yy .
 XXX .
 com can NOT 'ftp foo.com', they
		have to 'ftp gateway.XXX.com' (TIS) or SOCKS their
		way out ?


	If you are application level, how do you deal with the 
	problem that internal mailers, network client programs, etc
	can resolve A and MX records for "out there" -- but these
	same client programs can NOT connect to those addresses ?


	advTHANKSance
			- joe


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