Re: Spooler subsystem app accessing DNS
From: Don Kelloway (dkelloway_at_commodon.com)
Date: 06/09/03
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Date: Mon, 09 Jun 2003 03:21:02 GMT
"John S. Giltner, Jr." <giltjr@earthlink.net> wrote in message
news:3EE39FD7.7050907@earthlink.net...
>
>
> Just Plain Insane wrote:
> >
> > If Zone Alarm didn't alert him it would prove ZA's worthlessness.
> > When I first set up my firewall, one of the first connections made
> > outbound was localhost to my ISPs DNS servers with UDP on 135. I
> > had to set a rule so it would only do that for my ISPs DNS servers
> > so I could get DNS resoilution.
> >
> port 135 is for NETBIOS name resolution. Why do you need to do
NETBIOS
> name resolution to your ISP's DNS servers? TCP/IP uses 53 for name
> resolution.
>
Close. TCP Port 135 is not used for NetBIOS name resolution. It's used
for MS-RPC communication, which is necessary for dynamically mapping
internal services to ports on as needed basis. NetBIOS Name Resolution
uses UDP Port 137 and DNS uses port 53.
-- Best regards, Don Kelloway Commodon Communications Visit http://www.commodon.com to learn about the "Threats to Your Security on the Internet".
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