Where does DNS suffix come from?

  • Thread starter Thread starter Kent McPherson
  • Start date Start date
K

Kent McPherson

I'm running XP Pro SP1. I have a Linksys router. Comcast is my cable ISP.
When I run ipconfig, I see attbi.com as the Connection-specific DNS suffix.
I searched all over and couldn't see anywhere I was setting attbi.com. This
is the old suffix which I assume is no longer valid since Comcast bought out
the attbi network. attbi.com is in the registry under
hkey_local_machine/system/currentcontrolset/services/tcpip/parameters/dhcpdo
main.

On the DNS tab under my TCP/IP settings, I have Append primary and
connection specific DNS suffixes selected. The sub item Append parent
suffixes of the primary DNS suffix is not checked.

Where is this coming from?
 
Kent said:
I'm running XP Pro SP1. I have a Linksys router. Comcast is my cable ISP.
When I run ipconfig, I see attbi.com as the Connection-specific DNS suffix.
I searched all over and couldn't see anywhere I was setting attbi.com. This
is the old suffix which I assume is no longer valid since Comcast bought out
the attbi network. attbi.com is in the registry under
hkey_local_machine/system/currentcontrolset/services/tcpip/parameters/dhcpdo
main.

On the DNS tab under my TCP/IP settings, I have Append primary and
connection specific DNS suffixes selected. The sub item Append parent
suffixes of the primary DNS suffix is not checked.

Where is this coming from?
Click to expand...

attbi.com is still valid, and is the correct domain for those Comcast
customers who were inherited from AT&T's "BI" business. To see what your
"real" address is, go to www.grc.com and run ShieldsUp.
 
"Kent McPherson" said:
I'm running XP Pro SP1. I have a Linksys router. Comcast is my cable ISP.
When I run ipconfig, I see attbi.com as the Connection-specific DNS suffix.
I searched all over and couldn't see anywhere I was setting attbi.com. This
is the old suffix which I assume is no longer valid since Comcast bought out
the attbi network. attbi.com is in the registry under
hkey_local_machine/system/currentcontrolset/services/tcpip/parameters/dhcpdo
main.

On the DNS tab under my TCP/IP settings, I have Append primary and
connection specific DNS suffixes selected. The sub item Append parent
suffixes of the primary DNS suffix is not checked.

Where is this coming from?
Click to expand...

It's coming from Comcast, Kent. I just ran a packet sniffer on my
Comcast connection, and "attbi.com" appears in the "DHCP Offer" packet
sent to my computer by Comcast's DHCP server.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

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