[isapros] Re: ISA DHCP
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: <isapros@xxxxxxxxxxxxx>
- Date: Wed, 1 Nov 2006 16:50:46 -0800
Except for the firewall policy DHCP rule, those are the defaults in their
original state (might be worth money some day - don't let the kids play with
them).
-------------------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
-------------------------------------------------------
-----Original Message-----
From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On
Behalf Of Thomas W Shinder
Sent: Wednesday, November 01, 2006 16:44
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
What are these DHCP rules supposed to do?
What is not working when they're not working?
Thomas W Shinder, M.D.
Site: www.isaserver.org <http://www.isaserver.org/>
Blog: http://blogs.isaserver.org/shinder/
Book: http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7> MVP -- Microsoft
Firewalls (ISA)
________________________________
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Amy Babinchak
Sent: Wednesday, November 01, 2006 8:26 AM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
So I created a new SBS box last weekend and have not installed ISA Sp2
yet. Checked the DHCP rules and they are same as after ISA SP2. So it appears
that these are the default SBS DHCP rules. I still don't understand why they
are working. Guess I have a mental block on it. Anyone care to educate me?
Here's what we have:
System Policy
DHCP (Request) From Localhost to Anywhere for All Users
DHCP (Reply) From Internal to LocalHost for All Users
Firewall Policy
DHCP (Reply) From External to LocalHost for All Users
Amy Babinchak
________________________________
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Harrison
Sent: Friday, October 27, 2006 12:17 AM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
We need to clarify *which* DHCP rules you're talking about...
1. Default System DHCP policies allow
a. DHCP Request from Local Host to Internal (UDP:68 --> UDP:67)
b. DHCP Reply from Internal to local host (UDP:67 --> UDP:68)
2. SBS DHCP policies allow
a. DHCP Request from Internal to Local Host (UDP:68 --> UDP:67)
b. DHCP Reply from Local Host to Internal (UDP:67 --> UDP:68)
If a DHCP relay is in the path between the DHCP client and server, the
traffic between the server and the relay will actually appear as UDP:67 -->
UDP:67 regardless of direction. Note that ISA doesn't make any distinction
between this and DHCP Request traffic, since both are destined for UDP:67. Is
there a DHCP helper in either of these environments?
Based on the log excerpt you provided, it appears that it's the array
rules that are failing.
Is that correct?
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Amy Babinchak
Sent: Thursday, October 26, 2006 7:11 PM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
In SBS DHCP rules are automagically created in the system policy.
Amy Babinchak
Harbor Computer Services
(248) 546-6056 office
(248) 890-1794 mobile
http://isainsbs.blogspot.com
http://keepitsecure.blogspot.com
http://www.harborcomputerservices.net
________________________________
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Harrison
Sent: Thursday, October 26, 2006 9:26 PM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
He doth speaketh truly, doth he.
SBS always had to create an array-level rule allowing DHCP requests &
replies for the internal network.
I 'd be very surprised to see SP2 installation removing those, since
the SBS team had to have tested SP2 as well.
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Thomas W Shinder
Sent: Thursday, October 26, 2006 5:20 PM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] Re: ISA DHCP
Hi Amy,
I'm not sure what the sceanrio is is. Is there a DHCP server on the ISA
Firewall? If so, there never were any System Policy Rules that allow for this,
you've always had to create your own rules.
Tom
Thomas W Shinder, M.D.
Site: www.isaserver.org <http://www.isaserver.org/>
Blog: http://blogs.isaserver.org/shinder/
Book: http://tinyurl.com/3xqb7
MVP -- Microsoft Firewalls (ISA)
________________________________
From: isapros-bounce@xxxxxxxxxxxxx
[mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Amy Babinchak
Sent: Thursday, October 26, 2006 3:45 PM
To: isapros@xxxxxxxxxxxxx
Subject: [isapros] ISA DHCP
Here's the promised update for the DHCP stops working issue
after ISA SP2 install. More are starting to show up on the SBS yahoo group. The
server that I've seen belongs to Eriq Neale. I know Tom Shinder knows him, he's
a pretty competent guy from there in Texas.
Original Client IP Client Username Client Agent
Authenticated Client Service Server Name Referring Server Destination
Host Name Transport HTTP Method URL MIME Type Object Source
Source Proxy Destination Proxy Bidirectional Client Host Name Rule
Filter Information Network Interface Raw IP Header Raw Payload Log
Time Source Port Processing Time Bytes Sent Bytes Received HTTP Status
Code Cache Information Log Record Type Destination IP Destination Port
Protocol Action Client IP Source Network Destination Network
Result Code Error Information
0.0.0.0 CC-SBS - UDP
- - - -
10/26/2006 8:43:25 AM 68 0 0 0 0x0 Firewall
255.255.255.255 67 DHCP (request) Denied Connection 0.0.0.0
Internal Local Host 0xc004000d FWX_E_POLICY_RULES_DENIED 0x0
I also ran an ISA info. Checked the server against mine and the
system policy rules for DHCP are identical. Checked the NIC configurations
those look good too. Checked that .255 is part of the internal network. Checked
binding order and where DHCP is bound. Everything checks out.
If you recreate the DHCP system policy rules as firewall rules,
DHCP works. Saw it with my own eyes. DHCP was working prior to ISA SP2
installation.
I'm stumped. Anyone?
p.s. I wish you guys would monitor the ISA MVP list as well.
Amy Babinchak
All mail to and from this domain is GFI-scanned.
All mail to and from this domain is GFI-scanned.
All mail to and from this domain is GFI-scanned.
Other related posts:
